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Ordinance No. 2,025[A 6741 ,1 /967 ORDINANCE NO. 2025 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF BAYTOWN, TEXAS, ADOPTING REGULATORY MEASURES PERTAINING TO MECHANICAL WORK IN THE CITY OF BAYTOWN; CREATING A MECHANICAL BOARD; PROVIDING FOR APPOINTMENTS THERETO; DEFINING THE POWERS OF THE BOARD; ESTABLISHING THE POSITION OF CITY MECHANICAL INSPECTOR; INCORPORATING A STANDARD MECHANICAL CODE; PRESCRIBING A MAXIMUM PENALTY OF TWO HUNDRED ($200.00) DOLLARS; CONTAINING A SAVINGS CLAUSE; PROVIDING FOR THE PUBLICATION AND THE EFFECTIVE DATE THEREOF. BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF BAYTOWN, TEXAS: Section 1: The Code of Ordinances of the City of Baytown is hereby amended by the addition of a Chapter 162j Mechanical Code, providing regulatory measures pertaining to mechanical work in the City of Baytown, which shall read as follows, to wit: Chapter 162 MECHANICAL CODE Sec. 162-1. Chapter Remedial. This chapter is hereby declared to be remedial, and shall be construed to secure the beneficial interest and purposes thereof, which are the health, sanitation, general public .safety and welfare of the citizens of Baytown, by regulating installation and maintenance of all mechanical equipment. Sec. 162-2. Mechanical Board --Creation, membership, appointments. (a) There is hereby created a Mechanical Board, hereafter referred to as the Board, which shall consist of seven (7) members. The members of this board shall be residents of the city and shall be appointed by the city council. (b) The Board shall consist of: Position No. 1: A registered mechanical engineer. Position No. 2: A registered professional engineer. Position No. 3: A licensed mechanical contractor. Position No. 4: A licensed air conditioning contractor. Position No. 5: An architect. Position No. 6: A citizen not in building industry. Position No. 7: A general contractor. (c) The members shall hold office for a term of two (2) years unless relieved for cause prior to that time. Members 6742 ® in even -numbered places shall be appointed in even -numbered years. Members in odd -numbered places shall be appointed in odd -numbered years. Members shall not serve more than three (3) consecutive two year terms. Exception - The City Mechan- ical Inspector shall serve continuously. (d) The City Council may remove any member of the Board during the term for which he may be appointed. (e) Should a vacancy occur, the city council shall appoint a person having the prerequisite qualifications of the place vacated to fulfill the unexpired term of said place. (f) Any four voting members of the Board present shall constitute a quorum to transact business. (g) It shall be the duty of the Board to meet as soon after their appointment as is practicable. One member shall be elected Chairman and shall serve as the Presiding Officer of the Board for a period of one (1) year. Sec. 162-3. Powers and duties. (a) The Board shall have the power to determine the suitability of alternate materials and types of construction and to provide for reasonable interpretations of the provi- sions of the "Standard Mechanical Code" adopted by this chapter (ordinance). (b) The Board shall have the power to make and promul- gate its own rules governing its meetings and proceedings, subject to the provisions of this chapter (ordinance). Sec. 162-4. Mechanical Inspector or official. The City Mechanical Inspector or official, shall serve as ex officio secretary of the Board and shall perform the following services: (a) Keep the minutes, books, files and other records of the Board. (b) Issue all licenses in the name of the Board. (c) Send out all notices and attend to all correspon- dence under the direction of the Board. (d) Collect license fees provided for in the ordinance, which shall be deposited with the building official. (e) He shall perform such other duties as are incidental to his office and as may be required by the Board. (f) The City Mechanical Inspector shall enforce and execute all decisions and orders of the Board. (g) Miscellaneous office supplies shall be furnished to the Board by the Building Inspection Department. -2- ®` Sec. 162-5. Standard Mechanical Code --Adopted by Ll The City of Baytown hereby adopts a new mechani hereinafter referred to as the Standard Mechanical prepared by the Southern Building Code Congress In tional as amended or as hereinafter may be amended Congress. A copy of said mechanical code is attac as ordinance Exhibit "A." Not less than three (3 have been and are now filed in the office of the C of the City of Baytown. The provision therein shall be controlling in t. lation of mechanical systems, including alteration replacement, equipment, appliances, fixtures, fitt and/or appurtenances thereto, including ventilatin cooling, air conditioning and refrigeration system erators, and other energy-related systems. Sec. 162-6. Same --Amendments. Section 101.1 of the Standard Mechanical Code, edition, is hereby amended by deleting "Southern" title of said code. Section 102.1 of the Standard Mechanical Code, edition, is hereby amended to read: "102.1 Mechanical Inspector There is hereby established with the In., Department a position to be called Mechanica- or Official, which shall be responsible for I the duties assigned to said position by this Section 102.2 of the Standard Mechanical Code, edition, is hereby amended to read: "102.2 Same --Assistance The City Manager, with the approval of council, may appoint such number of inspecto and other employees as shall be authorized f _ time. No person shall be appointed as an in mechanical systems who has not had considera as a plumbing or mechanical inspector, maste engineer, or as a superintendent, foreman, o mechanic in charge of mechanical constructio Sec. 162-7. Penalty for violation of chapter pr Any person violating any of the terms and pro this chapter shall be guilty of an offense and u shall be fined not more than Two Hundred ($200.0 Each and every day that a violation continues sh a separate offense punishable as such. A failur with any requirement herein shall constitute a v thereof. -3- 6743 ference. al code Code erna- by said ed hereto copies ty Clerk e instal- , repairs, ngs heating, incin- 1973 from the 1973 ;pection . Inspector performing chapter." 1973 the city -s, assistants, -om time to >pector of )le experience plumber, competent 1. 11 sions. lisions of )ion conviction )) Dollars. Lill constitute to comply lolation u El C 6744 Section 2: Savings Clause: If any provisions, section, exception, subsection, paragraph, sentence, clause or phrase of this ordinance or the application of same to any person or set of circumstances, shall for any reason be held uncon- stitutional, void or invalid, such invalidity shall not affect the validity of the remaining provisions of this ordinance of their application to other persons or sets of circumstances and to this end all provisions of this ordi- nance -are declared to be severable. P. Section 3: Effective Date: This ordinance shall take effect from and after thirty (30) days from its passage by the City Council. The City Clerk is hereby directed to give notice hereof by causing the caption of this ordinance to be published in the official newspaper of the City of Baytown at least twice within ten (10) days after the passage of this ordinance. INTRODUCED, READ and PASSED by the affirmative vote of the City Council of the City of Baytown, on this the 24th day of June , 1976. TOM GENTRY, Mayor ATTEST: EILEEN P. HALL, City Clerk APPROVED: NEEL RHARDSON, City Attorney r� v 67 4 8 ' �vL,-_._ ...._�_-�- - ....ue, 4 J • .s.. s.++. �.-:,.%Li.bv.Y=.ai.iL'�a'11; 303.7 —Electric Heating Equipment l 304—Combustion and Ventilation Air" 304.1— General - 304.2 — Solid Fuel Equipment 304.3 —Liquid and Gas Fuel Equipment 304.4 — Required Fuel Inputs Over 400,000 BTU/Hour 304.5— Ducts for Combustion and Ventilation Air 304,6 -- Special Provisions 305._.Chimneys and Vents 305.1— General 305.2 - Chimney Construction 305.3,— Factory Built Chimneys 305.4.=31asonry Chimneys -General Requirements 305.5 - Masonry Chimneys for Residential Type Appliances 305 6=' -Masonry Chimneys for Low Heat Appliances 305.7 — Masonry Chimneys for Medium Heat Appliances 305.8—Masonry Chimneys for High Heat Appliances 305.9 - :Masonry Chimneys for Incinerators ,a 305.10 =Metal Chimneys (Smokestacks)—General Requirements 305.11 — _IAetal Chimneys for Low Heat Appliances 305.12 —Metal Chimneys for Medium Heat Appliances ,) 305.13 = Metal Chimneys for High Heat Appliances 305.14 - Metal Chimneys for Incinerators 305.15 -Chimney Connectors and Vent Connectors 305.16=Draft Regulators 305.17 - Fireplaces 306— Ventilation Systems 306.1— Required Systems 306.2—Elevated Duct Temperatures 306.3—Ducts, General 306.4—:Motors, Fans and Filters 306.5 — Safety Devices 307 —Exhaust Systems 307.1— Systems Required 5 307.2 —General, Provisions , 307.3 — Ducts,. General 307.4 - Ducts, Grease Hoods Only .: 307.5 —Exhaust Outlets 307.6 Hoods 307.7 = Fire Extinguishing Equipment CHAPTER IV — REFRIGERATION IL J SECTION 401— Classification of Refrigeration Systems 402—Classification of Refrigerants 403 —Equipment Location 404— Installation Requirements 405 — Miscellaneous - 406 — Field Tests -.,.CHAPTER .,V. -DUCTS AND DUCT SYSTEMS' SECTION 501— General .. :.. . �: 502 — Standards-, 503 — Construction of Ducts 504 —Flexible Couiectors ... 505 — Vibration Isolation Connectors 506 — Insulation t' . '507 —Ducts, in Cement Slabs ; 508 —Duct Supports, Hangers and Specialties 509—Fire Protection of Ducts 310 — Air Filters 511— Weatherproofing 512—Plenum Chambers 513 — Plenum Floor Systems 514 —Fresh Air Intakes CHAPTER Vl — PIPING SECTION 601— General . 602 —Steam and Hot Nater Piping 603 —Condensate Drain Piping 604—Chilled Water Piping 6 lu 6749 605 —Condenser Water Piping 606 — Make -Up Water Piping 607—Fuel Piping 608 — Refrigerant Piping 609 =Tests and Inspections CHAPTER' VII INCINERATORS: SECTION 701 Scope and Purpose.,. I 702—General Requirements for New, a nd Altered Installations 703` 03 ---�.APproved Equipment 704 Alternate Materials and Methods Ilk 705 Locations and Clearances - —Classification of Incinerators' 707 — Classification of Waste 708 — Gas -Fired Incinerators 709—Gas Burners 710 — Scrubber or Gas Washer 711= Stacks and Chimneys 712 Spark Arrestors 4 713 Marking Incinerators 714 Operation of incinerator CHAPTER Vill ELECTRICAL REQUIREMENTS qL SECTION 801— Electrical Connections 802— Electrical ignition and Control- Devices 803 —Electrical Ground 6:750 ' w...w�a:cx�.-w --t--'�.s.W.�..a-3:v.in.u.CxCLi.3..]e..9.r.u•.. �•u.vs;s.ix:.._..«:y]viiv'�u,v,. :.h_r_._ CDA Copper Development Association, Inc. . 405 Lexington Avenue _ New York, New York 10017 .- FMED Factory Mutual Engineering Division Standards -Laboratories Department 1151 Boston -Providence Turn Pike Norwood, Mass. 02062 =. FS Federal Specifications Superintendent of Documents. i Government Printing Office " Washington, D. C. 20402 IIA Incinerator Institute of America 60 East 42nd Street = New York, New York 10017 MSS Manufacturers Standardization Society of the Valve and Fittings Industry 420 Lexington Avenue New York, New York 10017 NESCA National Environmental. Systems Contractors .-Association 221 N. LaSalle Street 4 Chicago, Illinois 60601 NBS "National Bureau of Standards (Department of Commerce) Superintendent of Documents Government Printing Office ` Washington, D. C. 20402 NFPA National Fire Protection Association 60 Batterymarch Street Boston, Massachusetts 02110 NIMA National Insulation Manufacturers Association 7 Kirby Plaza Mount Kisco, New York 10549 NLPGA National L -P Gas Association 70 West Monroe Street Chicago, Illinois 60603 9 C U 6'751 ' .._-•-�......a wa'•'L .v...taar:�A%">'.Yz�1C'z:�.-w�.r.i..Sai'v.v.Js.15G:f'�-...;+.rv..::.a._+uWswe-r eu..s.�_..�..�a�..sae w+� - .a..._..0 q CHAPTER 1 -ADMINISTRATION SECTION 101 —TITLE AND SCOPE 101.1—Title -) The provisions embraced within the following chapters and sec- tions shall constitute, be known and cited as "The Standard Mechanical Code:' '°r• 101.2—Code Remedial This code is hereby declared to be remedial, and shall be con- strued to secure the beneficial interest and purposes thereof, which are health, sanitation, general public safety and welfare, by regulating installation and maintenance of all mechanical equipment. 101.3 — Scope The provisions of this code shall apply to the installation of mechanical systems, including alterations, repairs, replacement, equip- ment, appliances, fixtures, fittings and/or appurtenances thereto, in- cluding ventilating, heating, cooling, air conditioning and refrigeration systems, incinerators, and other energy-related systems. 101.4 — Maintenance All mechanical systems, both existing and new, and all parts thereof, shall be maintained in a safe condition. All devices or safe- guards which are required by this code shall be maintained in good working order. The maintenance of mechanical systems shall be the ' responsibility of the owner or his designated agent. SECTION 102 - ORGANIZATION t? $-',102.1— Mechanical Official There is hereby established a department to be called the Me- chanical Inspection Department, which shall be in the charge of the ' official so legally designated by the local govern` ing body 102.2 — Inspectors Tree mac_ t�Cr- The MPchanicaL _ffir,aI with the approval of the f 'hi e Annoin inp- Authority of the governmental agency, may appoint such number Ic 1 of officers, . inspectors, assistants, and other employees as shall be authorized from time to time. No person shall be appointed as inspec- tor of mechanical systems who has not had at least ten years' experience as a Plumbing or Mechanical Inspector, Master Plumber, Engineer, or as a Superintendent, Foreman, or competent mechanic in charge of mechanical construction. 11 E 102.3 — Restriction on Employees No officer or employee connected with the department, except one whose only connection is as a member of the board established by this Code, shall be financially interested in the furnishing of labor, material, or appliances for the construction, alteration, or maintenance of mechanical installations or in the making of plans or of specifica- tions therefor unless he is the owner of such building. No such officer or employee_ shall engage in any work which is inconsistent with his duties or with the interests of the department. . SECTION 103 — POWERS AND DUTIES OF ;:..`..:.;,.. MECHANICAL OFFICIAL 103.1- Right of Entry. The Mechanical Official shall enforce the provisions of this code and he or his duly authorized representative may enter any building, structure, or- premises to perform any duty imposed upon him by this code. 1.03.2 — Stop Work Orders Upon notice from the Mechanical Official that work on any me- chanical installation is being done contrary to the provisions of this code or in a dangerous or unsafe manner, such work shall be immedi- ately- stopped. Such notice shall be in writing and shall be given to the owner of such property, or to his agent, or the person doing the work, and shall state the conditions under which work may be re- sumed. Whereany emergency exists, oral notice given by the Me- chanical Official shall be sufficient. 103.3 — Revocation of Permits The Mechanical Official may. revoke a permit or approval issued under the provisions 'of this act in case there has been any false statementor•misrepresentations as to the material fact in the appli- 1 hi h th t v 1 b d I all cation or...p ans. on w c e perm r or appro a was ase .n - such cases no, permit fees shall be refunded. 103.4 — Unsafe Installations All mechanical installations, regardless of type, which constitute a hazard.to human life, health, or welfare are hereby declared illegal and shall be abated by repair and rehabilitation or by demolition in accordance.." with the procedure as outlined in Section 103.4—Unsafe Buildings, of the Southern Standard Building Code. 103.5 —Requirement Not Covered by Code Any requirement necessary for the safety, strength or stability of an existing or proposed mechanical installation, or for the safety 12 t., z at 5hr 6752 F,�<-� of the occupants of a building or structure, not specifically ,covered ical by this code, shall be determined by the Mechaneiai, subject to the approval of the �� *"�rraki�e–Autherdty. 103.6 — Alternate Materials and Alternate Methods of Installations Alternate materials and alternate methods of installations shall be approved in accordance with this Section.. 103.6.1- Existing Premises In existing buildings or premises in which mechanical instal- lations are to be altered, repaired, or renovated, the Mechanical Official has discretionary power to permit deviation from the provisions of this Code, provided that such a -proposal to deviate is first submitted for proper determination in order that health and safety requirements, as they pertain to mechanical installa- tions, shall be observed. 103.6.2 — APProval Provisions of this code are not intended to prevent the use of any material, device, method of assemblage or installation, fixture,' or appurtenance not specifically authorized, provided such alternate has been approved by the Mechanical Official or the Southern Building Code Congress. 103.6.3—Evidence of Compliance The Mechanical Official shall require sufficient evidence to enable him to judge whether proposed alternates meet the re- quirements of this Code for safety and health. 103.6.4 — Tests When there is sufficient evidence to substantiate claims for alternates, the Mechanical Official may require tests of com- pliance as proof to, be made by an approved agency at the expense of the applicant. Tests shall be made in accordance with generally recognized standards; but in the absence of such stand- ards, the Mechanical Official shall specify the test procedure. Tests may be required to be repeated if, at any time, there is reason to believe that an alternate no longer conforms to the requirements on which its approval was based. } 103.7 — Liability Any officer or employee, or member of any Board, charged with the enforcement of this code, acting for the local governing body in the discharge of his duties, shall not thereby render himself liable personally and he is hereby relieved from all personal liability for any damage that may occur to persons or property as a result of any act 13 required or permitted in the discharge of his duties. Any suit brought against any officer or employee because of such act performed by him in the enforcement of any provision of this code shall be defended by the Department of Law until the final termination of the pro- ceedings. ,- - 1 103.8 — Reports ... The Mechanical Official shall submit a report to the local gov- erning .body covering the work of the mechanical section of the de- partment during the preceding year. SECTION 104 — APPLICATION FOR PERMIT ` 104.1—When Required .: No person, firm, or corporation shall do or cause to be done, any installations, alterations, repairs, or replacement of equipment; or sys- tems covered by the provisions of this code, without first having ob- tained the proper permit from the Mechanical Official. Ordinary minor repairs may be made with the approval of the Mechanical Offi- cial without a permit provided that such repairs shall not violate any of the provisions of this code. 104.1.1— Permits Not Required Permits shall not be required for the following: 1. any portable heating appliance; 2., any, portable ventilation equipment; 3. any portable cooling unit; .:. 4.' any steam, hot or chilled water piping within any heating or cooling equipment regulated by this code; 5. replacement of any part which does not alter its approval or make it unsafe; _6. any portable evaporative cooler, and 7. any self-contained refrigerating system containing ten (10) pounds or less of refrigerant or actuated by motors of one (1) horsepower or less. 104.2 — Form Application for a permit shall be made in person. The applicant • shall furnish information as may be required to complete the appli- cation form by the Mechanical Official. 14 U K] 67-53 104.3 — Drawings and Specifications Whenever, in the opinion of the Mechanical Official, drawings and specifications are needed to show definitely the nature and char- acter of the work.for which the application is made, the applicant. shall furnish such 'drawings and specifications. These drawings and specifications shall be drawn to scale and submitted in duplicate. If approved, one (1) set shall be returned to the applicant, marked ap-_ proved, and one (1) set shall be retained and filed.as a permanent record in the. office of the Mechanical Official. The applicant's ap- proved set shall remain at all times on the job. Such information or drawings and specifications shall be specific, and this code shall not be cited as a whole or in part, nor shall the term "legal" or its equiva- lent be issued as a substitute for specific information. The Mechani- cal Official may, require the drawings and specifications to be certi- fied by a registered engineer. 104.4— Examination of Drawings. The Mechanical Official shall examine or cause to be examined each application for a permit and the drawings: and specifications which may be filed therewith, and shall ascertain by such examination whether the installation indicated and described is in,accordance with the requirements of this code and all other pertinent laws or ordi- nances. SECTION 105 — PERMITS 105.1— Action on Application (a) If the Mechanical Official is satisfied that the work described in an application for permit and the drawings and specifications whichILI. 'be may filed therewith, conform to the requirements of this code, and other pertinent laws and ordinances, he shall . issue a permit therefor to the applicant. (b) If the application for permit and the drawings and specifi- cations which may be filed therewith describe .work which does not conform to the requirements of this code or other pertinent laws or ordinances, the Mechanical Official shall not issue a permit but shall return the drawings to the applicant with his refusal to issue such a permit. Such refusal shall, when requested, be in writing and shall I contain the reasons therefor. .105.2 Condition of the Permit The Mechanical Official shall act upon application for a permit with plans as filed, or as amended, without unreasonable or unneces- sary delay. A permit issued shall be construed to be a license to pro - 15 J� ceed with the work and shall not be construed as authority to viclate, cancel, alter, or set aside any of the provisions of this code, nor shall such issuance of a permit prevent the Mechanical Official from there- after requiring correction of errors in plans or in construction, or of violations of this code. Any permit issued shall become invalid unless the work authorized by it shall have been commenced within six months after its issuance, or if the work authorized by such permit is suspended or abandoned for a period of one year after the time the work is commenced; provided, that for cause, one or more exten- sions of time for periods not exceeding ninety days each, may be allowed in writing by the Mechanical Official. SECTION 106 — FEES 106.1— General . LIJ No permit shall be valid until the feeI. s prescribed in this section shall have been paid; nor shall an amendment to a permit be approved until the additional. fees, if any, shall have been paid. 106.2—Failure to Obtain a Permit If any person commences any work on an installation before ob- taining the necessary permit from the Administrative Authority, the ' permit fee shall be doubled. 106.3 — Schedule of Permit Fees Permit Fees: (a) For issuing each per ..... ....:......... _.......$3.00 ,; (b) (1)' Fee for Heating, Ventilating, Duct, Air Conditioning and Refrigeration Systems shall be ten ($10.00) Dollars PLUS two ($2.00) Dollars per each one thousand ($1,000.00) Dollars or fraction thereof. - _ . (2) Repairs, alterations and additions to an existing system where cost is over five hundred ($500.00) dollars shall be two ($2.00) Dollars per each one thousand ($1,000.00) Dollars or fraction thereof in valuation plus five ($5.00) dollars:" ) (c) Fee for Re -Inspection. In case it becomes necessary to make a re -inspection of a Heating, Ventilating, Air Conditioning or Refrigeration System, the installer of such equipment shall pay a Re -Inspection Fee of Five ($5.00) Dollars. 16 1W (d) Temporary Operation Inspection Fee: For inspecting a Heat- ing, Ventilating Refrigeration, or Air Conditioning System, a fee of Five ($5.00) Dollars shall be paid by the Contractor requesting such. inspection, If the system is not approved Ar for temporary operation on the first inspection, for each sub= sequent inspection for such purpose, the usual Re -inspection Fee will be charged. (e); In all buildings except one and two family dwellings using self=contained Air Conditioning units less than two tons, the fee charged shall be that for the total tonnage of all units combined Paragraph (see (a) above for rate). Minimum fee shall be ten ($10.00) Dollars. (f) Boilers based on BTU Input: 33,000 BTU (1 BHP) to 165,000 (5 BHI') ........................$ 5.00 165,001 BTU (5 BHP) to 330,000 (10 BHP) -------------------- $10.00 330,001 BTU (10 BHP) to 1,165,000 (52 BHP) .................. $15.00 1,165,001 BTU (52 BHP) to 3,300,000 BTU (98 BHP).:..$25.00 Over 3,300,000 BTU ...........-.-.$35.00 (g) Re -Inspection Fee. In case it becomes necessary to make a re -inspection of the installation of a Boiler, the Person, Firm, _ Corporation or Owner to whom a permit is issued shall pay for each re -inspection a fee of Five ($5.00) Dollars. SECTION 107 — INSPECTIONS 107.1 — Inspection Required All new work and such portions of existing systems as may be affected by new work, or any changes, shall be inspected to insure com- s pliance with all the requirements of this code and to assure that the installation and construction of the mechanical system is in accordance with approved plans. 107.2 — Notification (a) Advance Notice: It shall be the duty of the installer to give reasonable advance notice to the Mechanical Official when work is ready for test or inspection.. (b) Installer's Responsibility: It shall be the duty of the installer to make sure that the work will stand the test prescribed before giving the above notice. (c) Retesting: If the Mechanical Official finds that the work will not pass the test, the instaIIer shall be required to make necessary correc- 17 tions and the work shall then be resubmitted for inspection. Where additional inspections are necessary for retesting there shall be an additional fee for eachu s ch inspection as per fee schedule in Section 106. 107.3 — Material and Labor Inspections The equipment, material? ,power, and labor necessary for the in- . spection and test shall be furnished by the installer. 107.4 = Inspections All equipment for which a 'permit is obtained under this code shall be inspected and, when in compliance with this code, approved by the Mechanical Official. No portion of any equipment intended to be concealed by any permanent .portion of the building shall be concealed until inspected and approved by the Mechanical Official or certified by a nationally recognized approved agency. When instal- lation of any equipment is complete, a final inspection shall be made. No equipment regulated by this code shall be connected to the fuel or power supply and placed in normal operation until itcomplies with all applicable requirements of this code and a final inspection approval has been issued. A final inspection approval may, upon notice, be revoked by the :Mechanical Official if it is found that the heating, cooling or refrig- eration equipment fails in any respect to comply with the require- ments of this code, so that the installation is unsafe, dangerous, or hazard to life. The Mechanical Official may accept inspection certifi- cation reports from a nationally recognized approval agency, in lieu of on-site inspection when on-site inspection is impractical. SECTION -108 — CERTIFICATE OF APPROVAL 108J.— Roughing -in Inspection Upon the satisfactory completion of the roughing -in inspection, approval shall be so noted on the Permit Card. This approval shall give the date of the roughing -in inspection and the initials of the inspector. 108.2 =Final Inspection Upon satisfactory completion and final inspection of the mechani- cal installation, a certificate of approval shall be issued by the Me- chanical Official. The building shall not be occupied prior to com- pletion of said system and/or issuance of certification of approval. i 108.3 = Temporary Approval A temporary certificate of approval may be issued for a portion or portions of a mechanical system which may be safely operated prior to final completion of the building. 18 6755 SECTION 109 —VIOLATIONS AND PENALTIES Any person, firm or corporation or agent who shall violate a provision of this code or fail to comply therewith or with any of the provisions thereof, or violate a detailed statement or plans submitted ? and approved thereunder, shall be guilty of a separate offense for each and every day or portion thereof during which any violation of any of the provisions of this code is committed or continued, and upon conviction in the Court of Jurisdiction for any such violation such person shall be punished by a fine of not more than Two Hundred ($200.00) Dollars or imprisonment for a term of not more than thirty (30) days. SECTION 110 —RIGHT OF APPEAL All persons shall have the right to appeal the. Mechanical Offi- cial's decision through a body appointed by the appropriate authority of the jurisdiction and qualified by experience and training to pass upon matters pertaining to building construction. SECTION 111 —VALIDITY If any section, sub -section, sentence, clause or phrase of this ordi- nance is for any reason held to he unconstitutional, such decision shall not affect the validity of the remaining portion of this code. t. 3' 19 ` rn 1W CHAPTER II - DEFINITIONS SECTION 201 For the purpose of this code, the following terms shall have the meaning indicated in this chapter. Absorption system:. a refrigerating system in which the gas evolved in the evaporator is taken up by an absorber. Administrative authority: the individual official, board, depart- ment, or agency established and authorized by a state, county, city or other political subdivision created by law to administer and enforce the provisions of the mechanical code as adopted or amended. Air: all air supplied to mechanical equipment for combustion, ventilation, cooling, etc. Standard air is air at standard temperature and pressure, namely 60 degree F. and 29.92 inches of mercury. Air conditioning: air conditioning is the process of treating air so as to control its temperature, humidity, cleanliness and distribution to meet the requirements for the conditioned space, Air conditioning system: an air conditioning system consists of heat exchangers, blowers, filters, supply exhaust and return ducts, and shall include any apparatus installed in connection therewith. Air (for Combustion): the amount of air required for the safe and proper combustion of fuel in fuel -fired appliances. Approved: accepted or acceptable under an applicable nationally in this code, or accepted as suitable recognized standard stated or cited . for the proposed use under procedures and powers of the Adminis- trative Authority. Boiler, heating (low pressure): hot water boilers operating at pressures not in excess of 160 pounds per square inch and 250' F. or steam boilers operating at pressures not in excess of fifteen (15) pounds per square inch (gage), used for heating buildings or struc- tures. (See also "High Pressure" and "Low Pressure"). Breeching (flue connection): a passage for conducting the prod- ucts of combustion from a fuel fired appliance .to the vent or chim- ney. (See also "Chimney Connector" and "Vent Connector"). . Bridge wall: a partition wall between chambers over which pass the products of combustion. s Brine: a liquid, used for the transmission of heat without a change in its state, having no flash point or flash point above 150 degrees F, { as determined in an approved manner. 21 E-• British thermal unit: the quantity of heat required to raise one pound of water from 59 degrees to 60 degrees F.—usually abbreviated BTU. Building use group classifications: the arrangement of buildings in classes according to use and occupancy, as set forth in the Southerny� ' Standard Building Code Burner: a device for the final conveyance of the fuel or a mixture of fuel and air to the combustion zone Chimney: a primarily vertical enclosure containing one or more j f passageways. 1. Chimney, residential appliance type: an approved chimney for removing products of combustion from residential type appli- ance producing combustion gases not in excess of 1000 degrees F. measured at the appliance flue outlet. - 2. Chimney, low -heat appliance type: an approved chimney for removing the products of combustion from fuel -burning low - heat appliances producing combustion gases not in excess of 1000 degrees F. under normal operating conditions but capable of producing combustion gases of 1400 degrees F. during inter- mittent forced firing for periods up to one hour. All tempera- - tures shall be measured at the appliance flue outlet. 3. Chimney, medium -heat appliance type: an approved chimney for removing the products of combustion from. fuel -burning medium -heat appliance producing combustion gases not in ex- cess of 2000 degrees F. measured at the appliance flue outlet. . 4. Chimney, high -heat appliance type: an approved chimney for removing the products of combustion from fuel -burning high - heat appliances producing combustion gases in excess of 2000 degrees F. measured at the appliance flue outlet. Chimney connector: the pipe which connects a fuel appliance to a chimney... (See Breeching). Chimney Factory Built: a chimney that is factory -made, listed by an accredited authoritative testing agency, for venting gas appliances, incinerators, and solid or liquid fuel burning appliances. s Chimney, masonry: a field constructed chimney of solid masonry units, bricks, stones, listed hollow masonry units or reinforced con- crete built in accordance with nationally recognized standards.' Chimney, metal: field -constructed chimney made of metal suitably corrosion resistant and built in accordance with nationally recognized standards. Combustible material: any material not defined as non-combustible. 22 IEI 9 6757 ...,....a.,....-s,._r.�-r��e:;.,.::.:..:,,,cam.:�ra�:m.er..c.�s::.:;:r.�..y.e.aaf•'�:1.<.�.w.....,..,....=.-`�i,..s...�:.�,x...,v. _.. ��E.F.i._ Combustion: as used herein, refers to the rapid oxidation of fuel accompanied by the production of heat or heatand light. Combustion chamber: the space in a heating appliance provided for the combustion of fuel. Combustion Chamber, primary (incinerator): chamber within an incinerator where primary ignition and burning of waste occur. Combustion. Chamber; secondary (incinerator): chamber where unburned combistible materials. from the primary chamber are com- pletely burned Compressor: a specific- machine, with or without accessories, for compressing a, given refrigerant vapor. Compressor unit: a condensing unit less the condenser and liquid receiver. Condensate: the liquid which separates from a gas (including flue gases) due -to a reduction in temperature. Condenser: a vessel or arrangement of pipe or tubing in which vaporized' refrigerant is liquefied by the removal of heat. Condensing unit: a specific refrigerating machine combination for - a given refrigerant, consisting of one or more power -driven compres-. sors, condensers, liquid receivers (when required), and the regularly furnished accessories. Drying hearth: a surface within the primary chamber upon which wet waste material is ,deposited for drying, prior to burning. Duct a tube or conduit used for conveying or encasing purposes as specifically defined below: 1. Air duct: a tube or conduit used for conveying air. (The air passages of self-contained systems are not be to construed as air.ducts.) �, 2. Pipe duct: a tube or conduit used for encasing pipe. Electric space heaters, portable: heatersnot intended for perma- nent connection to a structure or to electric wiring. Electric space heaters, stationary: heaters permanently mounted in a structure (air duct system) and which are permanently connected to electric wiring. Evaporator: that part of the system in which liquid refrigerant is vaporized to produce refrigeration. Exhaust system: an assembly of connected ducts, plenums, fit- tings, registers, grilles and hoods, through which air is conducted from the space or spaces and exhausted to the outside atmosphere. 23 Filter, air: a device used to remove air -borne solids from heating, ventilating, or air conditioning duct systems. Fire damper: an approved assembly arran ed the sage of air flow automatically in the event of fire restrict pas - L Flame safeguard: a device which will automatically shut off the ` fuel supply to a main burner or group of burners when the means of ignition of such burners become inoperative. - Flue connection (breeching): a passage for conducting the prod- ucts of combustion from fuel a fired appliance to the -vent of chim- ney... . (See also "Chimney Connector" and "Vent Connector"). Furnace: a completely self-contained fuel fire heating unit with burners, combustion chamber, heat exchanger and casing. Furnace, central: a self-contained fuel fired appliance intended primarily to supply heated air through ducts. Generator: any device equipped with a heating element used in the refrigerating system to increase the pressure of refrigerant g ant in its gas or vapor state for the purpose of liquefying the refrigerant. Heat exchangers: a. device used for the transfer of heat from ; one medium to another.:...'' .. Heater, room (space):a free-standing heatingunit burning rrung solid, liquid or gas fuel for direct heating of the space in and adjacent to that in which the unit is located. Heating system, central warm air: a heating system' consisting of an air heating appliance from which the heated air is distributed by means of ducts, pipes, or plenums including any accessory ap- paratus and equipment installed in connection therewith. " High pressure (and temperature) 1. Steam: any boiler, generator, pressure vessel, system, piping, or equipmentused for the purpose of heating or distributing steam for heating power, and processing, operating at pres- sures -of fifteen' (15) psi or less, shall be classed as low pres- sure. . . 2. Hot water an boiler, any. , generator, pressure vessel, system, Piping, or equipment used for purpose of heating or distribut- ' ing hot water for heating or processing, operating at pressures in excess of 160 psi and temperatures in excess of 250 de- grees F., shall be classed as high pressure. _..._ - Listed: listed refers to products which are shown in a list pub- lished by a nationally recognized approved agency and whose listing states that the product complies with nationally ' recognized safety requirements. 24 L' Low pressure (and temperature) 1. STEAM: any boiler, generator, pressure vessel, system, piping, or equipment used for the purpose of heating or distributing steam for heating power, and processing, operating at Pres- sures of fifteen (15) psi or less, shall be classed as low pressure.. 2. Hot water: any boiler, generator, pressure vessel, system, piping, or equipment used for the purpose of heating or dis- tributing hot water for heating or processing, operating at 160 psi and 250° F. or less, shall be classed as low pressure. Non -Combustible Material: A material which, in the form in which it is used, meets any of the following requirements: 1. Materials that are judged to be non-combustible shall have - been successfully tested in accordance with the "Method of Test for Determining Non -Combustibility of Elementary Ma- terials, ASTM E136-65." 2. Materials having a structural base of non-combustible material as defined above in paragraph 1, with a surfacing not more than one-eighth (1/g) inch thick which in addition has a flame spread rating not greater than fifty (50) when tested in ac- cordance with the "Method of Test for Surface Burning Char- acteristics of Building Materials, ASTM E84-68." 3. Materials, other than described in 1. or 2:, having a surface flame -spread rating no greater than twenty-five (25) without evidence of continued progressive combustion on any exposed surface that may be exposed by cutting through the material in any way. "The term. non-combustible does not apply to the flamespread characteristics ,of interior finish or trim materials. No material shall be classed as a non-combustible building material which is subject to increase in combustibility or flamespread beyond the limits herein established through the effects of age, moisture or other atmospheric conditions. Plenum: air compartment or chamber to which one or more ducts . are connected and which forms part of an air distribution system. Return air system: an assembly of connected ducts, plenums, fit- tings, registers, and grilles, through which air from the space or spaces to be heated or cooled is conducted back to the supply unit. (See also "Supply air system"). Soldered joint (refrigeration): a gas-tight joint obtained by the joining of metal parts with metallic alloys which melt at temperatures between 1000 degrees F. and 1400 degrees F. 25 9 26 Supply air system: an assembly of connected ducts, plenums, fit- ings, registers and grilles through which air, heated or cooled is con- ducted from the supply unit to the space or spaces to be heated or cooled. (See also "Return 'Air System"). Vent: a passageway; vertical or nearly so, for exhausting prod- ucts of combustion to the outer air. Vents, types: Type B Vents: Factory made vents listed by a nationally recog- nized testing agency for venting listed or approved appliances equipped to burn only gas. Type BW Vents: Factory made vents listed by a nationally recog- nized testing agency _ for venting listed or approved gas fired j vented wall furnaces..' Type L Vents: Factory made vents listed by a nationally recog- nized testing agency for venting listed or approved appliances equipped to burn gas or oil. Single -Metal Wall Vents: Vents constructed of sheet copper not less than No. 24' Manufacturer's Standard gauge or galvanized . iron of not less than No. 20 Manufacturer's Standard gauge, or other approved noncombustible corrosion -resistant material. Vent Connector: the pipe used to connect an approved fuel fired appliance to a chimney or vent. (See also "Flue Connection"). 1 `! Ventilation. the process of supplying air to, or removing air from, any space. For the purposes .of this code the minimum quantity and quality of outside and exhaust air introduced into or exhausted from the space shall be in compliance with the requirements stipulated herein. Ic :). Ventilation system: a mechanical or gravity system installed and operated in such a manner as to secure, with normal operation, the standard of ventilation required by this code. 26 n 16 67.59 r iF CHAPTER III -- AIR CONDITIONING, HEATING AND VENTILATION EQUIPMENT SECTION 301 — GENERAL This chapter is intended to insure the safe design, construction, installation, and repair of equipment used in systems pertaining to air conditioning (space cooling), heating, and ventilation. 301.1— Approval All equipment and installations shall be subject to the approval of the Mechanical Official. Listed equipment may be acceptable when installed in accordance with such listing subject- to the approval of the Mechanical official, and the equipment is labeled accordingly; in- . the cluding the seal or mark of the testing agency which certifies listing. :..., SECTION 302 — AIR CONDITIONING EQUIPMENT 302.1— Scope This section covers the location, installation., alteration, replace- ment, repair and maintenance of air conditioning equipment. J 302.2 — Labeling A permanent factory -applied nameplate(s) shall be affixed to equipment on whichshall appear in legible lettering, the manufac- turer's name or trademark, the model, serial number, and if listed, the seal or mark. of. the testing agency. A label shall also include the . following (a) Electrical Equipment. Electrical rating in volts, amperes, and motor phase; identification of individual electrical components in volts, amperes or watts, motor phase, BTU output and ' required clearance, if clearances are specified. (b) Absorption Units. Hourly rating in BTU; minimum hourly rating for units having, step or automatic modulating con- trols; type.of fuel; type of refrigerant; cooling capacity in BTU. 302.3 — Instructions Permanent factory -applied instructions for ignition, operation and - shutdown shall accompany the equipment. The manufacturer's instruc- tions shall remain attached to the appliance in a position to be easily - read during the life of the appliance. 27 302.4 — National Standards For the purpose of assisting in obtaining the objectives of this Mechanical Code, certain national standards are listed herein and may be referred to for clarification. Author 11 1 Designation and year of. Title of Standard "" Publication Guide and Data. Book - Equipment ASHRAE - 1972 'J Guide and Data Book - Systems ASHRAE -" 1976 American National Standard for Me- ANSI B9.1,- 1971 chanical Refrigerating Systems Water Cooling Towers NFPA Pamphlet 214 -1971 Standard for Installation of Residence NFPA Pamphlet 90B - 1971 Type Warm Air Heating and Air. Con- ditioning Systems '•; . Standard for Installation of Air -Con- ditioning and Ventilating Systems NFPA Pamphlet 90A - 1971 302.5 — Reserved 302.6 — Piping 302.6.1.— Chilled, Steam and Hot Water Piping, Gas Piping . Piping systems in which -chilled or hot water is transported for heating, air conditioning, or refrigerating shall be fabricated and installed in accordance with Chapter VI of this code. Gas piping shall'" conform to the Southern Standard Gas Code. . 302.7 —Pumps and Pump Motors- 302.7.1— Pumps Pumps external to listed equipment and used for circulation of water or other liquid flow in heating, ventilating, and air-conditioning t systems shall comply with the requirements for design and operation of "Centrifugal Pump for Process Use, ANSI B123.1-1971." 302.7.2 - Motors Synchronous motors that are part of a heating, ventilating,_ and air-conditioning system shall, comply with the "Requirements for Syn- chronous Motors, ANSI B50.11-1965." 28 6760 302.8 — Water Cooling Towers and Condensers . The construction and supports for water cooling towers, evaporat- ing condensers and air-cooled condensers shall comply with the . requirements of the Southern Standard Building Code. " Water from .such units shall be discharged into an approved dis- posal system in accordance with the Southern Standard Plumbing Code. All water supply, waste^ water and connection shall comply with the requirements of the Southern Standard Plumbing Code. 302.9— Duct Systems 302.9.1 Design and construction of air ducts shall comply with Chapter V. 302.9.2 — Clearances (a) Clearances from warm air ducts shall conform to Section 303.4. (b) Subject to the approval of the Mechanical Official, no clear- ance is required for ducts without heating used solely for ventilation, air cooling or air conditioning. _ 302.10 — Mechanical Refrigeration . All refrigeration equipment used as a portion.of air conditioning equipment shall comply with Chapter IV. SECTION 303 - HEATING EQUIPMENT .303.1 General' .: (a) Scope. This section covers the location, and installation for heat producing appliances and their accessories. (b) Listed Appliances. When the requirements for listed appli- ances and their accessories are different from the requirements of this section, such listed appliances may be installed in accordance with the. conditions specified in their listing. Listed appliances and their accessories installed or used not according to the conditions specified in their listing and all appliances not listed shall conform to the requirements of this section. 303.2 — Location (a) Accessibility for Service 1. Every appliance shall be located with respect to building construction and other equipment so as to permit access to -� the appliance. Sufficient clearance shall be maintained to 29 30 permit cleaning of heating surfaces; the replacement of filters; blowers, motors, burners, controls and vent con- nections; the lubrication of moving parts where required; and the adjustment and cleaning of burners and pilots. For attic installation the passageway and servicing area adjacent to the appliance shall be floored. 2. Appliances listed for outdoor installation may be installed without protection in ; accordance with the provisions of their listing and shall be accessible for servicing. (b) Hazardous Locations. No heat producing appliance or acces- sory thereto having an open flame or producing electric sparks or glowing particles shall be installed in any space having flammable vapor, flammable gas or dusty atmosphere unless listed for such use and approved by the Mechanical Official. (c) Boiler, Furnace and Heater Rooms. When located in buildings. .} having certain occupancies and when such buildings have heat pro- ducing appliances with certain input ratings, using certain fuels, boiler and heater rooms shall be separated by fire resistive rated noncombustible construction conforming to the Southern Standard Building Code. 303.3 —Mounting (a) Heating producing appliances listed for mounting on com- bustible floors shall be installed strictly according to their listings, subject to the approval of the Mechanical Official. 303.4 —Clearances for Heat Producing Appliances and Their Accessories (a) Clearances for listed heat producing appliances and their ac- cessories, when listed for greater or less clearances than stipulated in this code, shall conform to their listings, subject to the approval of the Mechanical Official. (b) Clearances not covered in this code shall be subject to the } approval of the Mechanical Official. 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O H cd N U d "� U —P.mm�pp,�d Cd�Ndf�-i +'.;> CU LU 11) w ��-+ r cdd.xa �°UUf�wf�+ HC7C3rT�'�u r. e Cd 0;-- m �r Lo c-6 N oo ci w �. .. o z coCd Cn O o asp 3 V - 3 c3v mP.`%3� cs .p p, c3 bn P, v d m a�+' •o . I wd14 n 3 F y cdoo vpvr� w -- Q. ..� o c r/1 .� 3 G v.�-c"a coin 0.0-0, om w°CdZ bo -. �. �� 0.P,ski %.bOw o.� boN 0 to 07 a U c3 cl Pc ra .0 p. O cd P. �w c1'� O Oy �p �pw r w a �. zQ Cd �¢�� 1-4 cq C113 ci C-8 m m C, R o — cd �i �; (c) Warm air ducts employed with steel fireplace units of circu- lating air type shall he constructed of metal or masonry. (d) Fireplace hearth extensions shall be provided of approved noncombustible material for all fireplaces. Where the fireplace open- ing is less than 6 sq. ft., the hearth extension shall extend at least 16 in. in front of, and at least 8 in. beyond each side of the fireplace opening. Where the fireplace opening is 6 sq. ft. or larger, the hearth extension shall extend at least 20 in. in front of and at least 12 in. beyond each side of the fireplace opening. Where a fireplace is ele- vated above or overhangs a floor, the. hearth extension shall also ex-,. } tend over the area under the fireplace.: (e) Fireplaces constructed of .masonry or reinforced concrete shall have hearth extensions of brick, concrete, stone, tile or other approved noncombustible material properly supported and with no combustible material against the underside thereof. Wooden forms or ` centers used during the construction of hearth and hearth extension shall be removed when the construction is completed. (f) Hearth extensions of approved factory built fireplaces and fireplace stoves shall be not less than %-in. thick of asbestos, concrete, . hollow metal, stone, tile or other approved noncombustible material. Such hearth extensions may be placed on the sub or finish flooring whether the flooring is combustible or not. The hearth extension shall be readily distinguishable from the surrounding floor::. (g) All wood beams, joists and studs shall be trimmed away from fireplaces. Headers supporting trimmer arches at fireplaces shall not be less than 20 inches from the face of the chimney breast. Trimmers shall not be less than 6 inches from the inside face of the nearest flue lining. (h) Woodwork shall not be placed within 4 inches of the back of a fireplace but this shall not prevent plastering directly on the ma- sonry or on metal lath and metal furring. . . (i) Woodwork shall not be placed within 6 inches of a fireplace opening. Woodwork above and projecting more than 13/s inches from a fireplace opening shall not be placed less than 12 inches from the top of a fireplace opening. 305.17.4 —False Fireplaces False fireplaces may he used in connection with listed gas or elec- tric heaters, provided such fireplaces are constructed of noncombus- tible materials. 58 305.15.10 -Draft Hoods For information concerning the use and installation of draft hoods, refer to ..Southern Standard . Gas Code. . 305.16 Draft Regulators (a) Gas appliances connected to chimneys, . other than those re- quired by Southern Standard. Gas Code to be installed with draft hoods, may be. installed .Nvith draft regulators if in accordance with the appliance manufacturer's. instruction. (b) For information concerning the use and installation of draft regulators with oil -burning appliances, refer to the "Standard for Oil - Burning Equipment,. NFPA 31, 1972.." (c) Solid fuel -burning appliances may be .installed with draft regulators to reduce draft intensity..Such regulators shall be installed. and set in accordance with ,the . instructions furnished with the ap- pliance or the draft regulator. (d) A barometric draft regulator, if used, shall be installed in the same room or enclosure as the appliance in such a manner that no dif- ference.in pressure between. the air in the vicinity of the regulator and the combustion air supply will be permitted. . 305.17. — Fireplaces_ 305.17.1— Factory -Built Fireplaces - Factory -built fireplaces shall be listed and . shall be installed in accordance. with the conditions of the listing. Hearth extensions shall be provided in -.accordance with Section. 305.17.2(f).." 305.17.2—Factory-Built Fireplace Stoves Factory -built fireplace stoves shall be listed and shall be installed in accordance with the conditions. of the listing. "- 305.17.3 —Masonry Fireplaces .. (a) Fireplaces shall be constructed of solid masonry or of rein- forced concrete with back and sides of the thickness specified in this paragraph, except as provided in Section 305.17.1. Where a lining of firebrick at least 2 inches thick or other approved lining is provided, the total thickness of back and sides, including the lining, shall be not . less than 8 inches. Where no such lining is provided, the thickness of back and sides shall be not less than 12 inches. (b) Steel fireplace units incorporating a, firebox liner of not less than -inch thick steel and an air chamber may be installed with ma- 74 sonry to provide a total thickness at the back and sides of not less than 8 inches, not less than 4 inches of which shall be solid masonry. 57 6 7 6.5 :.; A.� (h) Connectors shall be installed so as to avoid sharp turns or other construction features which would create excessive resistance to the flow of flue gases. A device which will obstruct the free flow .of flue gases shall not be installed in!a connector, chimney, or vent. This shall not be construed to prohibit the use of devices specifically listed for installation in a connector, such as heat reclaimers, draft regu- lators, and safety controls. (i) Connectors shall be securely supported and joints fastened with sheet -metal screws, rivets, or other approved means. (j) The entire length of a connector shall be readily accessible for i inspection, cleaning, and replacement, unless listed materials are used and previous approval has been obtained from the authority having jurisdiction. r ` (k) A vent connector shall not be. connected to a chimney flue serving a fireplace unless the fireplace opening is sealed or the chim- .? ney flue which vents the fireplace is permanently sealed below the ' ® connection. 305.15.8 - Interconnection - (a) Connectors shall not be connected to a chimney, vent, or vent- ing system served by a power exhauster unless the connection is made in the negative pressure side of the exhauster. (b) Two or more fuel -burning appliances may be connected to a ' single chimney or vent provided sufficient draft is available for safe e ` combustion in each appliance and removal of all the products of corn- bust.ion safely to the outdoors. Gas and oil appliances so connected. shall be with .equipped primary safety controls. ; 305.15.9 —Dampers (a) Manually operated" dampers shall not be placed in chimneys, vents or connectors of stoker fired, liquid or gas -burning appliances. Fixed baffles on the appliance side of draft hoods and draft regula- `', tors shall not be classified as dampers. (b) Automatically operated dampers shall be of approved type designed to maintain a.safe damper opening at all times and arranged to prevent the initiation or increase of firing unless the damper is opened to a safe position - (c) On gas appliances in excess of 800,000 ETU input having more than two draft hoods, fixed manual baffles may be in the used connectors between draft hoods and the common breeching as a means _ of equalizing the available draft pull. 56 305.15.6 — Location When the connector used fora gas appliance having a draft hood must be located in or pass through a crawl space or other cold area, that portion of the connector shall be of listed Type B or Type L vent material or be provided with equivalent means of insulation. .305.15.7 — Installation (a) A connector to a masonry, chimney shall extend through the wall to the inner face or liner but not beyond, and shall be firmly cemented to masonry. A thimble may be used to facilitate removal of the chimney connector for cleaning, in which case the thimble shall be permanently cemented in place with high-temperature cement. (b) A chimney connector or a vent connector shall not pass through any floor or ceiling. (c) Connectors for listed residential and low heat gas appliances with draft hoods except incinerators may pass through walls or parti- tions constructed of combustible material if: 1. Made of listed Type B or Type L material and installed with not less than listed clearances to combustible material. _ 2. Made of single wall metal pipe and guarded by a ventilated metal thimble not less than 4 inches larger in diameter than the vent connector. (d) Connectors of low heat appliances except listed residential and low heat gas appliances with draft hoods (Table 305-B, Column 1) shall not pass through walls or partitions constructed of combustible material unless they are guarded at the point of passage by: ' 1. Metal ventilated thimbles not less than 12 inches larger in diameter than the connector. . 2. Metal or burned fire clay thimbles built in brickwork or other approved fireproofing materials extending not less than 8 inches beyond all sides ofthe thimble. (e) In lieu of thimbles all combustible material in the wall or partition shall be cut away from the connector a sufficient distance to provide the clearance required from such connector. Any material used to close up such openings shall be noncombustible insulating material. (f) A connector of any medium or high heat appliance classified in Table 305A shall not pass through any wall or partition constructed of combustible material. (g) Connectors shall maintain a pitch of rise of at least 1/4 inch to the foot (horizontal length of pipe) from the appliance to the chimney. 55 11 0 to factors such as location, maintenance, use, etc., as well as en- gineering design factors. As a guide the following are gages of galvanized. steel for given diameter connectors: Galvanized Sheet Diameter of Gage No. Connector, Inches 24 10 or less 22 v 10 to 12 20 14 to 16 6 16 (b) Connectors used for gas appliances having draft hoods and for listed conversion -burner -equipped appliances having draft hoods may be constructed of materials having resistance to corrosion and heat not less than that of No. 28 gage galvanized steel, or they may be of Type B or Type L vent material. (c) Connectors made of Type L vent material may be used with oil appliances listed as suitable for use with Type L venting systems. 305.15.3 — Length A connector shall be as short and straight as possible. The appli- ance shall be located as close as practicable to the chimney, vent, or venting system. The horizontal run of an uninsulated connector to a natural -draft chimney, or vent, shall be not more than 75 per cent of the height of the vertical portion of the chimney or vent above the connector, unless part of an engineered venting system. 305.15.4 — Size The connector, for its entire length, shall not be smaller than the flue collar of the appliance unless otherwise recommended by the ap- pliance, chimney, or vent manufacturer. 305.15.5 — Clearance Clearance from combustible materials for chimney connectors shall be 18 inches for Residential type appliances, and Commercial Industrial type low -heat appliances. The clearance for Commercial - Industrial type medium -heat appliances shall be 36 inches. Vent connector clearances for gas appliances not equipped with distance draft hoods, except clothes dryers, should be 18 inches. This may be 6 inches for listed gas appliances equipped with draft hoods, and for boilers and furnaces equipped with listed conversion burners and with draft hoods. A vent connector of listed Type B or Type L venting material may be used with listed appliances and may be in- stalled in accordance with their listing. 54 C� r B. Commercial and Industrial Type Incinerators ; (a) Construction 1. Metal chimneys of commercial. and industrial type inciner- ators shall be lined with firebrick not less than 4% inches thick for the full height of the chimney. 2. Firebrick shall be laid in high temperature cement or fire clay mortar. . 3. Subject to approval by the authority having, jurisdiction, com- mercial and industrial type incinerators may be connected to a metal chimney without firebrick flue liner provided the incinerator is specially constructed .to produce low flue gas temperatures. (b) Termination. Metal chimneys of commercial and industrial type incinerators shall extend at least 4 feet above sloping roofs meas- ured from the highest point at which the metal chimney passes through the roof and at least 8 feet above flat roofs. In either case, the chimney shall extend at least, 2 feet higher than any portion of a building within 20 feet. (c) Clearance. A clearance of not less than 4 inches shall be pro- vided between the exterior surface of metal chimneys for commercial and industrial type incinerators and combustible material. 305.15 — Chimney Connectors and Vent Connectors 305.15.1— Connectors Required . Connectors shall be used to connect appliances to the vertical chimney or vent unless the chimney or vent is attached directly to the appliance. 305.15.2 — Materials Connectors shall_be made of noncombustible material capable of withstanding the flue gas temperatures produced by the appliances _and of sufficient thickness to withstand physical damage. The material of connectors shall also be resistant to corrosion. Connectors for ap- pliances installed in attics shall be of Type B or Type L vent material for listed gas appliances with draft hoods or of Type L vent material for oil appliances listed as suitable for Type L vents. For other ap- pliances allowed in attics, a chimney shall be attached directly to the appliance. r."._ Note: When selecting the gage of metal for connectors of appliances not installed in attics, consideration should be given 53 303.5 —Clearances with Protection Appliances may be installed in rooms, but not in alcoves or closets, with clearances less than specified in Table 3-3, provided the combus- tible material or appliance is protected as described in Table 3-4. CONSTRUCTION USING COMBUSTIBLE MATERIAL 'PLASTERED OR UN/PLASTERED A C` C SHEET METAL . OR OTHER' ® PROTECTION CONNECTOR OR APPLIANCE Figure 1 A equals the required clearance with no protection, specified in ` Table 3-3. B equals the . reduced clearance permitted in accordance with Table 3-4. The protection applied to the construction using combustible ma- terial shall extend far enough in each direction to make C equal to A. Fig. 1. Extent of Protection Required to Reduce Clearances 35 36 — -� •fib a� H�b�s` z E r�i O w o v. -0 m _ u ? a q q J N L– E> O •sou r r1 N N N a N - LL. V O u D 4 w r w Ol JJ LA u O CL 4 ` 0 >O b L d O m p _ O W C 'J A. cr q D r` w Vats in C9 b LL N N N w - N -N 'I LA – G M M N N N N w k. M b'- G C O �m EE 28 q O� bL – H – j .fl r uj - ' u O Z c c b a b b c C 0.0 p cs c o CL a n W C E>�o C O a Q v LL .-.Q N P m oauG 0—i— a w CL `c O u«E .k . . 36 — -� •fib a� H�b�s` E r�i w o v. -0 m _ u ? a q q J N . 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CL —> L t i c— M j ! vob3� i v u" c r io' �Z o ^o E'2r1�Ob i moo c i ic5 od ;t �°`� v 0y 0 ►W�mb°;^ E I° f b i Aa E ° O o«� o'er v I E i I E U b A ab 0 m i E E aEacbo, o d o� pL j �yS»«•amu, u I �o N i mo. ..- op �qr ° q` o.^3qb.., � b•E b � bE qq �;-v L OL A r C ^ O �� m _ OE r J O> n C r ry m �c C� �E3 ,p N • a»»vim�o C C4.0cmv- curio cNvm`o` O ✓ – b 0 nE - .n 36 — -� •fib C� E r�i w o v. -0 m _ u ? a q q J N E > C b q L A L r q u CL ` U .0 q u D 4 w r w Ol JJ CL 4 ` 0 >O b L d m p _ O C 'J A. cr q E •:° v c t 0-6 b 5 v� o E0 2 » 6 C � r • E ov v E g m O r �� r Q E r b'- G C O �m EE 28 q O� bL – – j .fl r s-0 „o c c b b b c C 0.0 p cs c o CL n _ oc >�m aab- vq C G �= E •3w� L b b •U - 4 C�� .G O .O � b 0. o w w CL `c O u«E E E > o E o• 0 . . . c'c v `t o> p o o of C L u w `nE o E c �u b — m`AL ov a "Ct– 07 0 u N f7 W"O N O O O . -z Z 6768 ®. � .. .. .__...._..,.,.,..c. �..a_.W,a-c;e: ,........_o-...<-u..,�xx..s.,..::c.a...............__,.....�.�:......-..aa:a...._._ _- _._,._ �.«..:.;iB:.L�w�.�+.c.,.=r. _ .... ... 303.6 —Fuel Piping & Connections (a) General. Each appliance shall be designed for use with the type of fuel to which it will be connected. No such appliance shall be converted from the fuel specified on the rating place for use with a different fuel without securing reapproval from the Mechanical Of- ficial. (b) Oil -burning Appliances. The tank, piping and valves for ap- pliances burning, oil shall be installed in accordance with the require- ments of Chapter VI of this code. When an oil burner is served by a tank any part of which is above the level of the burner inlet connection and where the fuel supply line is taken from the top of the tank, an approved anti -siphon valve or other siphon breaking device shall be installed in lieu of the shutoff valve. (c) Gas -burning Appliances. All appliances designed to burn gas shall be connected to the gas supply outlet in accordance with the Southern Standard Gas Code. 303.7—Electric Heating Equipment (a) Electric duct heaters shall be equipped with an approved auto- matic reset air outlet temperature limit controlthat will limit the outlet air temperature to not more than 200 degrees F. The electric elements of the heater shall be equipped with fusible links or a manual reset temperature limit control that will prevent outlet air tempera- ture in esces3 of 250 degrees F. . (b) Every electric comfort heating appliance shall bear a perma- nent and legible factory applied nameplates on which shall appear: 1. Name of trademark of the manufacturer. 2. The catalog (model) number or equivalent. 3. The electrical rating in volts, ampacity and phase. 4. BTU output rating. 5. Individual marking for each electrical component in amperes or watts, volts and phase. 6. Required clearances from combustibles. 7. A seal indicating approval of the appliance by an approved testing agency. (c) Every electric comfort heating appliance shall be connected in accordance with Chapter VIII of this Code. 37 SECTION 304 — COMBUSTION AND VENTILATION AIR 304.1— Combustion Air—General (a) The standards set forth in this section define the minimum ) requirements of air for combustion and ventilation. These standards shall not be decreased, however, manufacturers specifications' shall be followed where their requirements exceed these standards. The mini- mum dimension of rectangular air ducts shall be not less than three (3) inches. (b) To prevent space temperatures exceeding 120 degrees Fahren- heit, additional ventilation air shall be supplied to the equipment room. Equipment rooms shall not be ventilated by any means which would reduce pressures in the space sufficiently to draw gases of combustion from the appliance into the equipment room. ' (c) Operations of exhaust fans, kitchen ventilating systems or fireplaces shall be installed so as to avoid unsatisfactory equipment operation, 304.2— Combustion Air—Solid Fuel Equipment Rooms or spaces in which an appliance or appliances arranged to burn solid fuel are installed shall be provided with minimum unob- -- tructed combustion.air openings equal to 2 square inches for each 1000 BTU's per hour fuel. input of such appliances, with a minimum_ total free area of 2C0 square. inches as ,specified in Section 304.3. 304.3 —Combustion Air—Liquid and Gas Fuel Equipment Rooms or spaces in which a gas or liquid fuel -burning appliances are installed shall be provided with minimum unobstructed combustion air openings as follows: (a) Where appliances are installed in unconfined spaces in build- ings of conventional frame, brick, or stone construction having air infiltration and without storm windows, air for combustion and draft hood dilution is not required. (b) Where appliances are installed in a confined space within a one or two family residence, provision may. be made forsupplying this space with air for combustion and ventilation by eliminating the ceiling .of the confined space; provided, however, that the area above this confined space has openings directly to outside air as required by this section. (c) Where appliances are installed in confined space within a building having adequate air infiltration, provisions shall be made for supplying this space with air for combustion and ventilation. This may 38 • Ell G 6769 be accomplished through use of two permanent openings freely com- municating with interior areas of adequate infiltration or by com- pliance with provisions of item (b) or (d). These two permanent openings shall each have a free area of not less than 1 sq. in. per 1000 BTU per hour of input. rating. One opening shall be near the top OF of the confined space and onenear the bottom. If necessary, continuous ducts having cross-sectional areas at least equal to the free area of the opening shall be utilized to communicate with the source of air supply. The minimum dimensions of rectangular air ducts shall be not less than 3 inches. Any duct from the top opening must be hori- zontal or pitched upward. (d) Where appliances are installed in a confined space within a building, the building being' of unusually tight construction, air for combustion and ventilation for the confined space shall be provided with two permanent openings, one near the top and one near the bottom of the enclosure, each opening having a minimum free area of 19 square inches. The openings shall communicate directly, or by ducts, with the outside air. 1. When directly communicating with the outside air each open- ing shall have a minimum free area of one square inch per 4,000 BTU per hour of total input rating of all appliances in the enclosure. 2. When communicating with the outside air through vertical ducts, each opening shall have a minimum free area of one square inch per 4,000 BTU per hour of. total input rating of all appliances in the enclosure. 3. When communicating. with the outside air through horizontal ducts, .each opening shall have minimum free area of one square inch per 2,000 BTU per hour of total input rating of all appliances in the enclosure. 4. When ducts are used, they shall have at least the same cross- sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall not be less than 3 inches. Any duct from the top opening must be horizontal or .pitched. upward. (e) Where appliances are installed in unconfined spaces, within a building of unusually tight construction, air for combustion, ventila- tion, and draft hood dilution must be obtained from the outside air or from spaces freely communicating with the outside air. Under these conditions, a permanent opening or opening having a total free area of at least 19 square inches but not less than 1 square inch per 5,000 BTU per hour of total input rating of all appliances shall be provided. Where ducts are required they shall have at least the same cross-sectional area as the free area -of the openings to which they 39 connect. The minimum dimension of rectangular air ducts shall be not less than 3 inches. The air from the outside space must freely com- municate with the room in which the appliance is located. 304.4 —Combustion Air Required—Fuel Inputs Over 400,000 BTU/HR The size of combustion air openings specified in 304.3 shall not ) govern any installations having an input in excess of 400,000 BTU per hour. Where combustion air is taken from the space in which the fuel - burning appliance is located, a permanent opening to the outside air shall be provided having an area at least 108 square inches for each - 1,000,000 B.T.U: s per hour input. _ 304.5—Ducts for Combustion and Ventilation Air Ducts required for combustion air shall be of galvanized steel complying with Chapter. V or other corrosion -resistant material approved for this use;, and terminate in a space not less than 6 inches in depth in. front .of,.or open to,. the front or firebox side of the ap- pliance. Every such space shall extend from the floor to the ceiling of the appliance enclosure. Combustion air openings shall be covered with corrosion -resistant screen of not less than Y4 -inch mesh. 304.6 — Special Provisions to That Specified in Subsections 304.3 and 304.4 . . Alternate methods of supplying combustion air may be approved when special engineering assures an adequate supply of air for com- bustion, ventilation and draft hood dilution by mechanical means. Such mechanical systems shall be as approved by the Mechanical Offi- cial. and shall supply outside air to the space. In no case shall exhaust fans be used to draw air from a space in which gas or liquid fuel appliances are installed. ` SECTION 305 - CHIMNEYS AND !VENTS 305.1,- General , ) (a) Chimneys shall be required for all heating or heat producing appliances except electrical heating and appliances. listed for use with venting systems.. > Every chimney shall be constructed and every venting system shall be installed in accordance with the applicable requirements of ) this section. (b) Draft. Every chimney, vent or venting system shall be capa- ble of producing a draft at the appliance not less than that required for the safe operation of the appliance connected hereto. 40 T A ic 1W 6770 In A power exhauster may be used, except with incinerators, to in- crease low draft. When an .,exhauster is used, provision shall be made to shut off the fuel supply to the appliance in the event of failure of the exhauster. ' (c) Nothing in this Code shall prohibit the joining of two or more connectors into a combined connector, provided that all pipes are of sufficient size to serve all of the appliances thus connected, and pro- vided that all. pipes are constructed to comply with the severest re- quirements of any of those connected. (d) The connector of a fuel burning appliance shall not be con- nected into the chimney flue of an incinerator which has therubbish chute identical with the chimney flue. 305.2 — Chimney Construction — General Requirements (a) No chimney shall carry any load other than its own dead weight. (b) Chimney crickets of metal or other roofing materials shall be laid or installed on solid roof decking consistent with the construction of the roof. (c) All unsafe or dangerous chimneys shall be made safe or taken down. (d) Chimneys shall extend at least three (3) feet above the highest point where they pass through the roof of the building and at least two (2) feet higher than any ridge within ten (10) feet of such chimney. (e) An appliance equipped with a forced or induced draft system which may result in positive pressure in the venting system shall be connected to a pressure -tight venting system. (f) Raising Adjoining Chimneys 1. Whenever a building is hereafter erected, enlarged or raised, the owner of such building shall, at his own ex- pense, carry up, either independently or on his own build- ing, all chimneys, smokestacks, and smoke flues of an adjoining building which are within ten (10) feet of any portion of the wall extending above such chimney or flue. 2. The construction of such chimney shall conform to all requirements of this code. Such a chimney shall be carried up simultaneously with the walls. 3. It shall be the duty of the owner of the building to be erected, enlarged or raised to notify, in writing, at least ten (10) days before such work is to begin, the owner of the chimney affected, of his intention to carry up such chimney. 41 305.3 — Factory -Built Chimneys Factory -built chimneys shall be listed and shall be installed in accordance with the conditions of the listing, and the manufacturer's instructions. (a) Nothing contained in this code shall be construed as prohibit- ing the insulated. use of suspended factory -built chimneys y provided such assemblies have been tested and approved by a recognized labora- tory, for the use intended and are installed in accordance with their approval. (b) Factory -Built` chimneys' may be installed with zero clearance on wood structural members, such as framing, roof rafters, floor and _) ceiling joists and other component structural members, when it has been determined by test reports of recognized and approved testing laboratories that the unit does not transmit heat to the supporting " combustible members of more than 90 degrees F. above room tem- perature. (c) Supports for such chimneys attached to ceiling or floor joists shall be permitted provided the joists are of adequate size to support additional load. (d) All chimney installations shall. conform with the height re- • quirements of this code. - 305.4 = Masonry Chimneys—General Requirements (a) Support.. Masonry. chimneys shall. be supported on properly designed foundations of masonry or reinforced concrete. Noncombusti- ble material having a fire resistance rating of not less than 3 hours may be used to support masonry chimneys where such supports are independent of the floor construction and the load transferred to the ground. } (b) Corbeling. Masonry chimneys shall not be corbeled from a wall more- than 6 inches, nor shall a chimney be corbeled from a wall which is less than 12 inches in thickness unless it projects equally on " each side of the wall provided that in the second story of a 2 -story dwelling corbeling of chimneys on the exterior of the enclosing walls may equal the wall thickness: Corbeling shall not exceed one ir_ch .! projection for each course of brick projected. " (c) Change in size or shape at roof not permitted. A change in size or shape of a chimney flue where the chimney passes through the roof, shall not be made. within a distance of 6 inches above or below the .roof joists or rafters. (d) Cleanout openings. Cleanout openings provided in chimneys shall be equipped with ferrous metal doors and frames arranged to �remain-tightly closed when not in use. Adequate clearance between cleanout doors and combustible material shall be provided. 42 U KI C 6771 (e) Firestopping. All spaces between chimneys and floors and ceilings through which chimneys may pass shall be firestopped with noncombustible material. The firestopping of spaces between chimneys and wood joists, beams, or headers shall be to a depth of one inch only placed on strips of metal or metal lath laid across the spaces • between combustible material and the chimney. (f) Smoke test. Masonry chimneys shall be proved tight by a smoke test after erection and before being put into use. 305.5 — Masonry .° Chimneys for Residential Type Appliances — (See Table 305.A) (a) Construction 1. Masonry chimneys shall be constructed of solid masonry units or reinforced concrete with walls not less than 4 inches thick or rubble stone masonry not less than 12 inches thick. 2. Masonry chimneys for residential type appliances shall be lined with approved fire clay tile flue liners not less than 5/8 of an inch thick, or with other approved liner of material that will resist corrosion, softening or cracking from flue gases at temperatures up to 1800 degrees F. 3. Fire clay tile liners shall be installed ahead of the construction of the chimney as it is carried up, carefully bedded one on the other in fire clay mortar or as listed in Section 1402.12 (Table 3) of Southern Standard Building Code with close fitting joints left smooth on the inside. 4. Liners shall be separate from the chimney wall and the space between the liner and masonry shall not be filled; only enough mortar shall be used to make a good joint and hold the liners in position. 5. Flue liners shall start from a point not less than 8 inches below the intake. They shall extend as nearly vertically as possible for the entire height of the chimney. 6. Where two adjoining flues in the same chimney are separted only by flue liners the joints of the adjacent flue liners shall be staggered at least 7 inches. 7. Where more than two flues are located in the same chimney, masonry wythes (partitions) at least 4 inches wide and bonded into the masonry walls of the chimney shall be built at such points between adjacent flue linings that there are not more than two flues in any group of adjoining flues without such Wythe separation. 43 (b) Termination. Masonry chimneys for residential type appli- ances shall extend at least 3 feet above the highest point where they pass through the roof of a building and at least 2 feet higher than any portion of a building within 10 feet. (c) Clearance from combustible material 1. All wood beams, joists and studs shall be trimmed away from chimneys. Headers,. beams, joists and studs shall be not less . than 2 inches from the outside face of a chimney or from masonry enclosing a flue. Ends of wood girders may be sup- P ported on corbeled shelf of a masonry chimney provided there . is not less than 8 inches of solid masonry between the ends and the flue liner. 2. No combustible lathing, furring or plaster grounds shall be placed against a chimney at any point more than IY2 inches from the corner of the chimney, but this shall not prevent plastering directly on the masonry or on metal lath and metal furring, nor shall it prevent placing chimneys for residential type appliances entirely on the exterior of a building against the sheathing. 305.6—Masonry Chimneys for Low Heat Appliances - (a) Construction - 1. Masonry chimneys shall be constructed of solid masonry units or reinforced concrete with walls not less than 8 inches thick, + except that rubble stone masonry shall be not less than 12 inches thick. 2. Masonry chimneys for low heat appliances shall be lined with ( , approved fire clay tile flue liners not less than 5/8 of an inch " thick, or with other approved liner of material that will resist corrosion, softening or cracking from flue gases at tempera- ture up to 1800 degrees F. - 3. Fire clay tile flue liners shall be installed ahead of the con- struction of the chimney as it is carried up, carefully bedded .' one on the other in fire clay mortar or as listed in Section 1402.12 (Table 3) of Southern Standard Building Code with close fitting joints left smooth on the inside. 4. Flue liners shall start from a point not less than 8 inches below the intake. They shall extend as nearly vertically as possible for the entire height of the chimney. 5. Where two adjoining flues in the same chimney are separated only by flue liners, the joints of the adjacent flue liners shall be staggered at least 7 inches. 44 v 6772 u1c✓....�a'iwrw...a:.s.:.;.i.>:....u:Ll:�%-..r..rc�..Y�.....:.. :: 'r _.�..e1.M1� � ,1^...�..3�`:i-n..u... `L§'w:,:..�^-3� _ - 6. Where more than two flues are located in the sarne chimney, masonry wythes (partitions) at least 4 inches wide and bonded into the masonry walls of the chimney shall be built at such, points between adjacent flue linings that there are not more than two flues in any group of adjacent flues without such wythes separation. (b) Termination. Masonry chimneys for low -heat appliances shall extend at least 3 feet above the highest point, where they pass through the roof of a building and at least 2. feet higher than any portion of a building within 10 feet. (c) Clearance from combustible material. ' 1. All wood beams, joists and studs shall be trimmed away from chimneys. Headers, beams, joists, and studs. shall be not Iess ,C;- than 2 inches from the outside face of a chimney or from F masonry enclosing a flue. 2. Combustible lathing, furring or plaster grounds shall not be placed against a chimney at any point more than 11/2 inches from the corner of the chimney, but this shall not prevent Alas - tering directly on the masonry or on metal lath and metal fur- ring, nor shall it prevent placing chimneys for. low heat appli- ances entirely on the exterior of a building against the sheathing. 305.7 — Masonry Chimneys for Medium Heat Appliances (a) Construction. Masonry chimneys for medium heat. appliances shall be constructed of solid masonry units or of reinforced concrete not less than 8 inches thick, except that stone masonry shall be not less than 12.inches thick; and in addition, shall be lined with not less than 41/2 inches of fire brick laid on the 41/ inch bed in fire clay mortar, starting not less than 2 feet below the chimney connector entrance and extending for a distance of at least 25 feet above the chimney connector entrance. Chimneys extending 25 feet or less above the chimney connector shall be lined to the top. " (b) Termination. Masonry chimneys for medium heat appliances shall extend not less than 10 feet higher than any portion of any building within 25 feet. (c) Clearance from combustible material. Masonry chimneys for medium heat appliances shall have a clearance of 2 inches, from build- ings and structures. 305.8— Masonry Chimneys for High Heat Appliances (a) Construction. Masonry chimneys for high heat appliances shall be constructed with double walls of solid masonry units or of reinforced concrete each not less than 8 inches in thickness, with -an 45 air space of not less than 2 inches between them. The inside of the interior walls shall be of fire brick not less than 41/2 inches in thick- ness laid on the 4% inch bed in fire clay. mortar. (b) Termination. Masonry chimneys for high heat appliances shall extend not less than 20 feet higher than any portion of any building within 50 feet. (c) Clearance from combustible material. -Masonry chimneys for high heat appliances shall have sufficient clearance from buildings and structures to avoid 'overheating combustible material, to permit inspection, maintenance operations on the chimney and to avoid danger ILE of burns to persons. Clearances shall be based on. good engineering practice and acceptable to the authority having jurisdiction. 305.9—Masonry Chimneys for Incinerators type incinera- ) A. Residential. Masonry chimneys for residential tors shall be constructed in accordance with the requirements for Chimneys for Residential Type Appliances, Section 305.5. B. Fuel -Fed Incinerators (apartment house, type). (a) Construction 1. The flue of fuel -fed incinerators shall serve the incinerator only and be used for no other purpose. 2. The flue liner shall be straight and plumb and shall be smooth on the inside. 3. The size of incinerator flues shall be in accordance with the following: Where not more than one service opening is provided, the t size of flue shall be not less than 14 by 14 inches or 196 square inches, inside measurements, except that in one family dwell- ings the size shall be not less than 12 by 12 inches or 144 square inches. -..- Where two to six service openings are provided, the size of flue. shall be not less than 18 by IS inches or 324 square ) inches, inside measurements. Where seven or more service openings are provided, the size of flue shall be not less than 22 by 22 inches or 484 square - inches, inside measurements. with 4_ A masonry chimney serving an incinerator a combustion chamber having a horizontal combined hearth and grate area of 7 square feet or less shall have walls of clay or shale brick work not Iess than 4 inches thick with a lining of 4% inches of fire brick for a distance of not less than 10 feet above the roof of the combustion chamber; beyond this 46 U 01 point chimney walls shall consist of not less than 8 inches of clay or shale brickwork with a standard fire clay tile flue liner not less than 5/8 inch in thickness extending from the top of the fire brick lining to the top of the chimney. 5. A masonry' chimney serving an incinerator with a combustion. chamber having a horizontal combined hearth and grate area exceeding 7 square feet shall have walls of clay or shale brick- work not less than 4 inches thick with a lining of 4% inches of fire brick for a distance of not less than 40 feet above the roof of the combustion chamber; beyond this point, chimney ..walls shall consist of not less than 8 inches of clay or shale brickwork with a standard fire clay tile flue liner not less than 5/8 inch in thickness extending from the top of the fire brick lining to the top of the chimney. 6. Other constructions may be used if equivalent to the construe - tion outlined in the. preceding paragraphs, in structural. strength, insulating value and ability to withstand thermal expansion and flame impingement. . 7. Fire brick shall be laid in high temperature cement or fire clay mortar. 8. A chimney flue that is divided into two channels, one for feed in- refuse and the other for the discharge of combustion gases, shall be constructed as specified in this section. 9. Masonry chimneys for fuel -fed incinerators shall be supported on properly designed foundations of masonry or reinforced concrete. Norimcombustible material having a fire resistance rating of not less than 3 hours may be used to support ma- sonry chimneys where such supports are independent of the floor construction and the load is transferred to the ground. They shall be so constructed as not to place excessive stress upon the roof of the combustion chamber. Masonry chimneys may be supported on incinerator walls. 10. All flues shall terminate in a substantially constructed spark arrester with openings not greater than 3/4 inch, or be pro- vided with other suitable means of avoiding discharge of fly particles. Expansion chambers used as a secondary combustion chamber shall be constructed equivalent to that of the incin- erator combustion chamber. Those used only for settling shall be of construction equivalent to that of the upper portion of incinerator. (b) Termination. Masonry chimneys of fuel -fed incinerators shall extend at least 4 feet above sloping roofs measured from the highest point at which the chimney passes through the roof and at least 8 feet above flat roofs. In either case, the chimney shall extend at least 2 feet higher than any portion of a building within 20 feet. 47 (c) Clearances 1. 'A clearance of not less than 2 inches shall be provided between _-,. the exterior surface of chimneys for fuel -fed apartment house type incinerators and combustible material. 2:_ Combustible lathing, furring: or plaster grounds shall not be 'a. i placed against chimney at any point more than lei inches from the corner of: the chimney but this shall not prevent .: plastering directly on the masonry or on metal lath and metal furring; nor shall it prevent placing chimneys entirely on the -:: exterior of a building against the sheathing. "Service (d) openings to incinerators. All service openings into an ' incinerator flue shall be provided with a hopper or other charging device constructed of metal of sufficient thickness and durability to prevent cracking, breakage, or deformation in normal usage. Such hopper or other charging device shall be firmly built into the masonry and shall be so designed and installed that no part will project into the flue and that the opening to the flue exterior will be closed off while the service opening (hopper) door is fully open. The hopper or other device shall be counter -weighted or otherwise devised so that it will close automatically upon release and be so constructed as to be tightly fitting when in the closed position. C. Commercial and Industrial Type Incinerators .(a) Construction .. 1. Masonry chimneys of commercial and industrial type incinera- tors, except.as provided in the following paragraphs (b) and - _.(c) shall be not less than 8 inches of clay or shale brickwork or reinforced concrete lined with fire brick not less than 4% '_inches thick for the full height of the chimney. 2. Subject to approval by the authority having jurisdiction, com- mercial and industrial type incinerators may be connected to chimneys constructed of 8 inches of clay or shale brickwork or reinforced concrete lined with fire clay flue liner, where the . incinerator is specially constructed to produce low flue gas temperatures. 3. Other constructions may be used if equivalent in structural strength, insulating value, and ability to withstand thermal expansion and flame impingement, to paragraphs 1 and 2 above. 4. Fire brick and other refractory lining shall be laid in high ® .temperature cement or fire clay mortar. 5. Masonry chimneys for commercial and industrial incinerators shall be supported on properly designed foundations of ma- sonry or reinforced concrete. Noncombustible material having 48 6774 a fire resistance rating of not less than 3 hours may be used to support masonry chimneys where such supports are inde- pendent of the. floor construction and the load is transferred to the ground. They shall be so constructed as not to place excessive stress upon the roof of the combustion chamber. Masonry chimneys may be supported on incinerator walls. 6. Incinerators. used for the burning of rubbish or other readily combustible solid waste material shall include effective means for arresting sparks and fly particles, such as an expansion chamber; baffle walls, o r other effective arrangement, or the ¢. flues of- such incinerators shall be provided with an aproved arrester having opening not greater than 1/2 inch. spark (b) Termination. Masonry chimneys for commercial and industrial type incinerators shall extend at least 4 feet above sloping roofs measured from the highest point at which the chimney passes through " through the roof, and at least 8 feet above flat roofs. In either case, ® the chimney shall extend at least 2 feet above any ridge, •parapet, cornice, penthouse or other obstruction within 20 feet. (c) Clearances. A clearance of not less than 4 inches shall be pro- vided between the exterior surface of masonry chimneys for commer- cial and industrial ,type incinerators and combustible material. 305.10 — Metal Chimneys (Smokestacks) —General Requirements (a) Metal chimneys shall be of adequate thickness based on good engineering practice, properly riveted or welded, and securely sup- ported. NOTE.. When selecting the gage of metal chimneys consid- eration should be given to factors such as location, maintenance, use, etc., as well as engineering design factors. As a guide the following are gauges of uncoated sheet steel for given cross- sectional areas: Mf-rs. Std. Gage No. Area (Sq. In.) 16 Up to 154 14 154 to 201 12 201 to 254 10 Larger than 254 I (b) Metal chimneys shall not be carried up inside of ventilating ® ducts unless such ducts are constructed and installed as required by this standard for chimneys and the ventilating ducts are used solely for exhaust of air from the room or space in which the appliance served by the metal chimney is located. 49 (c) Metal chimneys shall have sufficient clearance from buildings and structures to avoid overheating combustible material, to permit inspection and maintenance operations on the chimneys and to avoid danger of burns to persons. 30x.11- Metal Chimneys for Low Heat Appliances (a) Termination. 1. Metal chimneys for residential type low heat appliances except as provided in 305.11(a)2 shall extend at least 3 feet above the highest point where they pass through the roof of a building and at least 1 2 feet higher than an g y portion of a building within 10 feet. " 2. The outlet of a metal chimney for residential type and low heat appliances_ equipped with an exhauster may terminate at a loca- tion not less than 3 feet from an adjacent building or building opening and at least 10 feet above grade or walkways. In any case, the outlet r shall be so arranged that the flue gases are not directed so as to jeopardize people, overheat combustible structures, or enter building openings in the vicinity of the outlet. (b) Clearances. ' 1. Exterior metal chimneys used only for residential type low heat appliances as defined in Table 305A shall have a clearance of not less than 6 inches from a wall of wood frame construc- tion and from any combustible material. 2. Exterior metal chimneys over 18 inches in diameter shall have a clearance of not less than 4 inches, and those over 18 inches or less in diameter a clearance of not less than 2 inches from a building wall of -other than wood frame construction. C.i 3. An exterior metal chimney shall not be nearer than 24 inches to any door or window or to any walkway, unless insulated or shielded in an approved manner to avoid burning a person who might touch the chimney. 4. Where a metal chimney extends through any story above that_, in which the appliances connected to the chimney are located, it shall be enclosed in such upper stories with walls of non- combustible construction having a fire resistance rating of not less than one hour. 5. The enclosure shall provide a space on all sides of the chimney i sufficient to permit inspection.and repair. 6. The enclosing walls shall be without openings, except door- ways equipped with approved self-closing fire doors at various floor levels for inspection purposes. 50 7. Where a metal chimney used for residential type defined in Table 305A is located in the same story of a building as that. in which the appliances connected thereto are located, it shall have a clearance of not less than 18 inches from a wall of wood frame construction and from any combustible material. 8. Where a metal chimney serving only low heat appliances as defined in Table 3.05A passes through a roof constructed of combustible material, it shall he guarded by a ventilating thimble of noncombustible material, of galvanized iron or approved corrosion resistant metal, extended not Iess than 9 inches below and 9 inches above the roof construction, and of - a size to provide not less than 6 inches clearance on all sides of the chimney; or the combustible material in the roof con- struction shall be cut away so as to provide not less than 18 inches clearance on all . sides of the chimney, with non-com- bustible material used to close up such opening entirely. 305.12—Metal Chimneys for Medium Heat Appliances (a) Termination. Metal chimneys for medium heat appliances shall extend not less than 10 feet higher than any portion of any build- ing within 25 feet. ®I. Exterior metal chimneys used for medium heat appliances as defined in Table 305A shall have a clearance of not less than 24 inches from a wall of wood frame construction and from any, combustible material. 2. Exterior metal chimneys over 18 inches in diameter shall have a clearance of not less than 4 inches and those 18 inches or ' less in diameter a clearance of not less than 2 inches from a building wall other than wood frame construction. 3. No portion of an exterior metal chimney shall be nearer than 24 inches to any dooror window or to any walkway, unless insulated or shielded in an approved manner to avoid burning F a person who might touch the chimney_ • 4. Where a metal chimney extends through an Y g Y story of a band- ing above that in which the appliances connected to the chim- ney are Iocated, it shall be enclosed in such upper stories with walls which are continuous of noncombustible construction having a fire resistance rating of not Iess than one hour. 5. The enclosure shall provide a space on all sides of the chimney sufficient to permit inspection and repair. 6. The enclosing walls shall be without openings, except doorways equipped with approved self-closing fire doors at various floor levels for inspection purposes. 7. Where a metal chimney serving a medium heat appliance as defined in Table 305A passes through a roof constructed of combustible material, it shall be guarded by a ventilating thimble of galvanized iron 'or approved corrosion resistant metal, extending not less than 9 inches below and 9 inches ' above the roof construction, and of a size to provide not less :. than 18 inches clearance, on all sides of the chimney. 8. Where a metal chimney used for medium heat appliances as .defined in Table 305A is located in the. same story of a build- } ing as that in which the appliances connected are located; it -J shall have a clearance ,of not less than 36 inches from a wall of wood frame construction and from any combustible ma- terial. i 305.13 — Metal Chimneys for High Heat. Appliances (a) Construction. Metal chimneys used for high heat appliances as defined in Table 305A shall .be lined with not less than 41/2 inches of fire brick laid in fireclay mortar extending not less than 25 feet above the chimney connector entrance. Chimneys extending 25 feet or less above the chimney connector shall be lined to the top. _,,,.,(b) Termination. Metal chimneys for high heat appliances shall _ extend not less than .20 feet higher than any portion of any building within 50 feet. (c) Clearance from combustible material. Metal chimneys for high heat appliances shall have sufficient clearance from buildings and structures to avoid overheating combustible material, to permit inspec- tion, for maintenance operationson the chimney and to avoid danger S of burns to persons. Clearances shall be based on good engineering ` practice and acceptable to the authority having jurisdiction,, 305.14'— Metal Chimneys for Incinerators A. Residential Type Incinerators. Metal pipe not less than No. 20 galvanized sheet gage number or other equivalent noncombustible corrosion resistant material may be used for residential type incinera- tors installed in locations such a sheds, breezeways or carports pro- vided the metal pipe is exposed and readily examinable for its full length and clearances- not less than 1 inches are maintained from combustible material.. The metal pipe shall extend at least 3 feet above the highest point where it passes through the roof and at least 2 feet higher than any portion of the building within 10 feet. Where the metal pipe passes through a roof constructed of combustible material clearances shall conform to the requirements for interior metal chim- neys for Low Heat Appliances 305.11(b)4, 5, 6, 7 and 8. 52 6776 (c) Air exhausted from bath, toilet, urinal, lavatory, locker, coat room, kitchen, boiler room, or rooms of similar use shall not be recir- - . ` culated at any time. _ 307.2 — General Provisions c. , (a) If a greaterquantity of air is supplied by a mechanical ventilating supply system than .is removed by a mechanical exhaust " system for a room, adequate means shall be provided for the natural exit of the exce s air supplied.. If a mechanical exhaust system only is installed for a room or if a greater quantity of air is removed by a mechanical exhaust system than is supplied by .a mechanical ven- tilating supply system for a room,, adequate means shall be provided for the natural supply of the -deficiency in the air supplied. (b) The air removed by every mechanical exhaust system shall be discharged out-of-doors at a point where it;will not cause a nuisance ' and from which it cannot again be readily drawn in by a ventilating system except that air which iso to be used for recirculation may be discharged to a supply system. (c) Mechanical exhaust from bath, toilet, urinal, locker, service sink, closets and similar rooms, shall be an independent system. - 307.3 — Ducts — General The materials used in every mechanical exhaust system shall v be of sheet metal or other approved materials in accordance with Chapter V. Materials shall be of non-absorbent and moisture and cor- rosion resisting character. The design and construction of all equipment and the weight and be that bracing of all duct work shall such will operate under normal t > conditions without excessive vibrations. (See Chapter V). Ducts shall 6 be substantially air -tight. Linings, if used, shall be securely anchored. 307.4 —Ducts— Grease Hoods Only (a) Material. The duct system shall be constructed of steel, cop- per, or other material approved for the use intended. No vibration isolation connector shall be used, unless it consists of a metal sleeve joint packed with asbestos rope and its design is acceptable to the Mechanical Official. . Ducts and plenums having an area of 4 square feet or less . shall be constructed of not less than No. 16 Galvanized Sheet gage steel or of copper sheets weighing not less than 48 ounces per square foot. Ducts and plenums greater than 4 square feet in area shall be con- structed of not less than No. 14 Galvanized Sheet gage steel or of copper sheets weighing not less than 56 ounces per square foot. 65 All joints and seams, except the vibration isolation connector, shall be made with a continuous grease tight weld or braze made on the external surface of the duct system. Every portion of the duct system exposed to the outside air shall be suitably protected against corrosion. _.. .. (b) Prevention of Grease Accumulation.Every duct system. shall be so constructed and installed that grease cannot become pocketed in any portion thereof, and the system shall slope not less than 1 inch per lineal foot toward the hood or toward an approved grease res- When a centrifugal fan is used it shall be positioned so the dis- charge outlet is in a bottom horizontal position and the air shall be so diverted that there will be no impingement on the roof, other equip- ment or parts of the structure. }} (c) Openings. No duct system shall have openings therein, other'/ _ than those required for proper operation and maintenance of the sys- tem. The duct system shall be constructed and designed to permit thorough cleaning of the entire system. Any portion of such system having sections inaccessible from the duct entry of discharge shall be provided with adequate cleanout openings. All cleanout openings shall be of sufficient size and Iocated so as to permit a thorough cleaning of the entire system. Cleanout openings shall be equipped.with tight- fitting doors, constructed of metal which is equal to or greater in thickness than the ducts, and such doors shall be equipped with a sub- stantial method of latching, sufficient to hold the door tightly closed. y These doors shall be so designed that they can be opened easily with- out the use of a tool. (d) Support. Duct systems shall' be securely fastened in place .% at every change of direction and as indicated in Chapter V, except there shall be no penetration of any duct or plenum wall. (e) Air Velocity. Ductsystems shall be designed and installed, in a manner, to provide an air velocity within the duct system of not less than 1500 feet per minute. Each room provided with a duct system shall have an adequate air supply admitted to the room, to provide the amount of air required to be exhausted. (f) Separate System. A separate system and individual duct sys- tem shall be provided exclusively for each grease hood, except as provided herein. A single duct system may serve more than one grease hood located in the same story of the building provided that in addition 66 i 6777 z. to other requirements of this Mechanical Code the installation also F: complies with the following. i, 1. All hoods served by the system shall be. located in the same room or adjoining rooms; 2. No portion of the interconnecting duct shall pass through any construction which would require the opening to be. fire pro- tected as specified in the Southern Standard Building Code. (g) Duct Ducts penetrating a ceiling, wall or floor 4: .Enclosure. shall be enclosed from the point of penetration to the outside air as required for vertical openings in the Southern Standard Building Code. The shaft or enclosure shall be separated from the duct by a minimum of 3 inches and a maximum of 12 inches and this area shall be ven- tilated to the outside air. Such enclosure shall be sealed at the point CIL of penetration. The shaft . or enclosure shall . be used exclusively to r. enclose a single grease exhaust system. - k... (h) Fire-resistive Access Openings. If cleanout openings are lo- _ - cated in ducts within a fire-resistive shaft or enclosure, access open- ings shall be provided in the shaft or enclosure at each cleanout point. s These access openings shall be equipped with tight-fitting sliding or ® hinged doors, equal in fire-resistive construction to that of the shaft or enclosure. _ (i) Dampers. No damper shall be installed in any portion of the is an approved fire- y. duct system, .unless the system equipped ,with h f; extinguishing system. (j) Clearance.. Every duct system shall have a clearance from �- combustible construction of not less than 18 inches. This clearance may be reduced to not less than 3 inches provided the combustible material is protected with materials as. approved for one-hour fire- resistive construction on the duct side. (k) Motors, Fans, and Exhaust Outlets. Motors, fans and exhaust outlets for grease hood duct systems shall comply with all applicable requirements as specified in Sections 306.4 and 307.5 307.5 —Exhaust Outlets Exhaust outlets for ducts that convey noxious gases, flammable vapors, corrosive vapors, and for ducts serving commercial food heat- processing equipment, shall terminate outside of the building and at least 10 feet from any adjacent building, adjacent property line, or f. air intake opening into any building, and shall be located at least 10 feet above the adjoining grade level. Every such exhaust outlet which is located above the roof shall extend at least 40 inches above ® the roof surface. 67 F ...>........ c.+`.-au.�:��t3aau.i+rG.:—.......r..s..v.d�.X.✓:tTt"vx.ie..a..s Y.C:. ��a}L'e'.cu.xuuwuau3k'ie- .... �.��% The exhaust from hoods serving commercial food heat -processing equipment may terminate in a properly engineered air recovery sys- tem for recirculation to the room in which the hood is located. i 307.6 — Hoods " (a) Location. A hood shall be installed at or above all commercial food heat -processing equipment in a food establishment. For the pur- pose of this Code a food establishment shall include any building or portion thereof appropriated to the processing of food but shall not include a one and two-family dwelling unit.' l Provisions shall bemade for air to enter the room in which the hood is located at a rate not less than that at which the room air is exhausted by the hood. " (b) Material and Installation. All canopy and noncanopy type hoods shall comply with the following requirements: 1. Every hood shall be constructed of galvanized steel, stainless steel, copper, or other material approved for the use intended. Hoods constructed of galvanized steel shall be not less than No. 18 Galvanized Sheet gage. Hoods of stainless steel shall be not less than 20 gage. Hoods constructed of copper shall be of copper sheets weighing not less than 24 ounces per square foot. 2. Every hood shall be securely fastened in place by noncombus- tible_ supports. 3. Every joint and seam shall be liquid -tight externally -welded. 4. Every hood shall be so ;designed and installed to provide for ahorough cleaning of the entire hood.. 5. When grease gutters are provided, they shall drain to a col- lecting receptacle fabricated, designed and installed to be readily accessible for cleaning..., 6. Every portion of a hood shall have clearance from combustible construction of not less than 18 inches. This clearance may be reduced to not less than 3 inches provided the combustible material is protected with materials as specified in Section 307.4. Hoods less than 12 inches from the ceiling or wall shall„ be flashed 1 solid with approved metal. 7. Grease filters or other means of grease extraction shall be required,and shall be of steel construction, or other approved material, designed for the specific purpose and shall be readily accessible for cleaning. 68 C: G 6//8 SS -�_•..._..,..<..>:.».....�;...ts..:a�............_.�s�nvsr..�e..�m.,.:.,a.a�....-.,�'.....>�t... .,._.....,., _..:,..�.. � - _.-. �-�v.3)))).1��. estc The height of Ahe lowest. edge of a grease filter located above the " cooking surface or the heating surface shall be not less than that set forth in Table 376.- (c) Residential Range Hoods. When. required as part of the as- sembly, ventilation ducts from residential range hoods shall exhaust to the outside air through an independent system. (Section 307.7 is not applicable.) TABLE 3-6 — MINIMUM DISTANCE BETWEEN THE LOWEST EDGE OF A GREASE FILTER AND THE COOKING SURFACE OR THE HEATING SURFACE Duct System and Hood With Fire -Extinguishing System (In Feet) No exposed Flame Grilles, French Fryers, etc. 2 Exposed • Flame and Burners .2 Exposed Charcoal and Char- .• broil Type Fires 4 ! Fire -extinguishing system shall be of an approved type. _ t '307L.7— Fire Extinguishing Equipment Fire extinguishing equipment shall be installed for the protection of duct systems, grease removal devices and hoods. Listed fire ex- tinguishing systems shall be installed in accordance with terms of their listing and manufacturing instructions. Other fire extinguishing equipment shall be installed in compliance with applicable standards. 69 �l N'4 CHAPTER IV - REFRIGERATION SECTION 401 — CLASSIFICATION OF REFRIGERATION SYSTEMS Refrigerating Systems shall be divided into classes, each descrip- tive of the method employed for; extracting heat, as follows: (a) Direct System is one in which the evaporator is in direct contact with the material or space refrigerated or is located in air circulating passages communicating with such spaces. (b) Indirect System. is one in which a liquid, such as brine or water, cooled by the refrigerant, is circulated to the material or space refrigerated or is used to cool air so circulated. Indirect systems which are distinguished by the type or method of application are given in the following paragraphs: ; (1) Indirect Open -Spray System is one in which a liquid, such as brine or water, cooled by an evaporator located in an enclos- ure external to a cooling chamber, is circulated to such cooling chamber and. is sprayed therein.. -- (2) Indirect Closed -Surface System is one in which a liquid such as brine or water, cooled by an evaporator located in an en- closure external to a cooling chamber, is circulated to and ,3 through, such a cooling chamber in pipes or other closed circuits.. (3) Indirect Vented CIosed-Surface System is one in which a liquid, such.as brine or water, cooled by an evaporator located in a vented enclosure external to a cooling chamber, is circu- lated to and through such cooling chamber in pipes or other closed circuits. (4) Double Indirect Vented Open -Spray System is one in which a liquid, such as brine or water, cooled by an evaporator lo- cated in a vented enclosure external to a cooling chamber, is circulated to a second enclosure where it cools another supply of a liquid, such as brine or water, and this liquid in turn is is therein. circulated to a cooling chamber and sprayed (c) Double (or Secondary) Refrigerant System is one in which an evaporative refrigerant is used in a secondary circuit. For the purpose of this code, each system enclosing a separate body of an evaporative refrigerant shall be considered as a separate direct system. 70 6779 11 f-W SECTION 402 — REFRIGERANT CLASSIFICATION Refrigerants are, for the purpose of this code, divided into groups as follows: i Group 1 Carbon Dioxide (Refrigerant 744)....................... - Dichlorodifluoromethane (Refrigerant 12)... ............................... CCL2F2 - Dichlorodifluoromethane, 73.8%......... .--------- ........._-----.-._-.._-_-._-_CCL2F2) ` and Ethylidere Fluoride, 26.2%....... ........................................ CH3CHFz (Refrigerant 500) Dichloromethane (Methylene Chloride)....... ............. ------------ .------- CH2CLz (Refrigerant 30) Dichloromonofluoromethane (Refrigerant 21)... ........................ CHCL2F = Dichlorotetrafluoroethane (Refrigerant 114)----------------------------- C2CL2F4 Monobromotrifluoromethane (Refrigerant 13B1)..... .............CBrF3 Monochlorodifluoromethane (Refrigerant 22)..........................CHCLF2 Monochlorodifluoromethane, 48%......................:.........................CHCLF21 . ® and Monochloropenta-fluoroethane, 51.2%.............. :------- .... CCLF2CF3S (Refrigerant 502) Monochlorotrifluoromethane (Refrigerant 13)........... .................. CCLF3 Octafluorocyclobutane (Refrigerant C318)........................................C4Fs Trichloromonofluoromethane (Refrigerant 11).............................CCL3F Trichlorotrifluoroethane (Refrigerant 113)...................... ......... C2CL3F3 Group 2 Ammonia .. , . .. - . Dichloroethylene...... ........... .............................•---•--------...----••........Ci2H2CL2 Ethyl chloride ..................•.-•----------•-----•---.-.--..-:.-....----------------- C2H2CL x `' Methyl Chloride................. ....:• ....................................... ...... CH3CL ..Methyl formate------..._...•..............>........................................HCOOCH3 Sulphurdioxide...............:...........•------------------•--•---.--..---•----•-------•-------••---502 Group 3 cButane .............__..........------.C4H i o Ethane...-...-----•---------------------------------------•--•----...-•-•------.-.--.-----------------------C2He Ethylene.............. --------------------------------------------------------------- --------------- --... C2H4 ` Isobutane--------------------•-----------........._............-----•-•--•---....------.........(CH3)3CH Propane-----------------------------------------------•-------••-----.--•--------------- ------------------C3Hs SECTION 403 — EQUIPMENT LOCATION No portion of any refrigerating system shall be located in any elevator shaft, dumb-waiter shaft, or any shaft having moving objects therein. 41 Every room or space, .other than a machinery room complying with the requirements of this Chapter, in which any refrigerant -con- taining portion of a condensing unit is located, shall be provided with permanent gravity ventilation openings of not less than 2 square feet total area, opening directly to the outside of the building, or extend- ing to the the building outside of by continuous ducts, or by a me- chanical exhaust system of ventilation arranged to provide a complete change of air in such room .or space at least every 20 minutes and to discharge to the outer air. No refrigerant compressor of more than one horsepower rating shall be located less than 10 feet from any public aisle or exit pas- sageway in any Occupancy unless separated by. partitions of a mini- mum One -Hour Fire -Resistive construction. All refrigerant piping and fittings, brine piping and fittings which during normal operation could reach a surface temperature below the dery point of the surrounding air and are located in spaces •� or areas where condensation could cause a safety hazard to the.build- ing occupants, structure, electrical equipment, or any other equipment, shall be protected in a manner to prevent such damage. No compressor shall be located in any hazardous location. No portion of any refrigerating system shall be installed in any location where it would be subject to damage from an external source. SECTION 404 —INSTALLATION REQUIREMENTS r (a) Foundations and Supports for condensing units or compressor units shall be of substantial and non-combustible construction when more than 6 inches high. (See Paragraph (c) ). 1 (b) Moving Machinery Mne should. be guarded in accordance with ap- plicable safety standards, or as required by the Mechanical Official. (c) Clear Space adequate for inspection and servicing of con- densing units or compressor units shall be provided. (d) Condensing Units or Compressor Units with Enclosures shall be readily accessible for servicing and inspection. (e) Water supply and Discharge Connections shall be made in accordance with Southern Standard Plumbing Code. (f) Illumination adequate for inspection and servicing of condens- ing units or compressor units shall be provided. A minimum of a 100 watt source within 10 feet of the equipment shall be provided. (g) Electrical Equipment and Wiring shall be installed in accord- ance with the National Electrical Code ANSI -C1-1971, and provided that the person doing such work, as provided for in this code, is au - 72 306.4 — Motors, Fans, and `Filters' ' (a) Motors and fans shall be of sufficient capacity to provide the required air movement as specified in the Southern Standard Building or Code. Every motor and fan shall be so installed as to afford access for,servicing or ., -; (b) . Fan motors- shall: not be installed inside the ducts or under hoods in any ventilation system conveying flammable vapors or com- bustible dusts, or serving food. preparation equipment, nor shall any belt or chain -driven apparatus be inside any such duct or under any such hood unless the belt or chain andany pulley connection therewith is entirely enclosed and grounded.:` •- .: (c) Every fan blade located in any duct shall be of rigid non- combustible construction. In any ventilation system conveying flam- mable vapors or combustible dust, the fan blade, shaft and casing shall be of a nonsparking material;. Bearings for fans shall .be self- lubricating or shall be lubricated from outside the duct. (d) Air filters, other. than grease hood filters regulated by Sec- - tion 307, shall be of a type that, in a clean state, will not burn freely. Liquid adhesive coatings. used on filters shall have a flash point of 350 degrees F., Cleveland open cup tester or higher. 306.5 — Safety Devices Whenever a fire damper is installed it shall be installed and con- structed to comply with Chapter V. Ducts discharging combustible material directly into any combus- tion chamber shall be equipped with- a device designed to prevent fireflashback into other portions of.the system. .. SECTION 307,— EXHAUST SYSTEMS ) 307.1— Systems Required -(a) Exhaust systems" shall be provided, maintained and operated for all occupied areas where machines, vats, tanks, furnaces, forges, salamanders, and any other equipment and processes in such areas produce or throw off dust or, particles sufficiently light to float in w� the air, or which emit heat odors, fumes, spray, gas or smoke, in such quantities as to be irritating or injurious to health or safety, and shall mechanically discharge such exhaust to the outdoor atmosphere. The total outdoor air supplied shall be equal in volume to that removed and shall be conditioned to a temperature equal to the normal tem- perature of the space from which the air was removed. (b) All equipment and system service rooms, which house sources of odors, fumes, noxious gases, smoke, steam, dust, spray, or other contamination shall be such as to prevent spreading of any such con- tamination to any other occupied parts of the building. 64 i i' G Y f 9 t. 4 �a�iov.,.. 'r.wso4)" w cd oom� o �P4�.Cd "C3 cd En��+ Cd 0 :7 N - d =..0cn ai �Cd �P o R �cdtQ - (1) � Ndl H b, �•� � cu cd El Elf cd cc Cd bo 1r•i r: V} VI . �i rte,' :' Jr Cd 3w C, ./y 'C7 m V �ti' C�!..�r F-�.-Oi t3 .ri F'1 Sr' •,5.i: . Cd a EnE `cd CD (D '..a ani c� . UA d ..-W F Cd �O Gcd y vs y, E4 V o R N a��.� �� LU "' Z z y Z p a .. W 71, E-4LA 0 CD W i Or Y en (� i, cdVQ CdP4 0 4) Co > Cd US C'JO U u dl EnSNr 0uCcts •o y '.3 '�� ti cd M bo cu cs D. O 0Z.�",. A 9 •O E-4 w ctf ".Y O wxa�>=�,�axx w N M V �O. tp IN 00 C) O. H N r'1 62 t o - N cd m d) rn if.) gra O 'C ^P cd w o co m u ai o Cd y CA. ,H m P. to 0 uj 0 o �. U } w N P P - • N ce ice: Cd w ^as c O U s. U s• m v N m 0 P ... 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[1 U 61 6.782 I: thorized to r 7 emove and replace electrical control devices, remove. and replace fuses, and disconnect and reconnect +' motors, all of which shall be integral parts, or incident. to the operation of refrigeration equip- inent or apparatus as herein defined when incident to the, repair or_- maintenance of such equipment or apparatus. (h) Gas Fuel Devices and. Equipment used with refrigerating. systems shall be installed in accordance with Southern Standard. Gas Code. (i) Open Flames. When the quantity -of flammable refrigerant in: any one refrigerating system exceeds the amount given in Table 4-1 for each 1000 cubic feet of room volume in which the system or any part thereof, is installed, then.no flame -producing device or hot surface: above 800 F shall be permitted in such room .and all electrical equipment in the room shall conform to the requirements of Hazard- ous Locations Class I the National of Electrical Code, ANSI -Cl -1971. (j) FIammable Refrigerants as listed in Table 4-1 shall not be used in a refrigerating system in excess of 1000 pounds, unless ap- proved by the authority having jurisdiction. TABLE 4-7 — MAXiMUUM PERMISSIBLE QUANTITIES OF FLAMMABLE REFRIGERANTS t, Name Chemical Maximum quantity r formula in lb. Per 1000 cu. ft. F €i of room volume Butane..- IA— -----•------- ------------ -CaHro 2Y Ethane-•-------------------------------------------------CzHg 2i/z . . o, Ethyl chloride ------------------.....-----...-..---.-.CzHsCL 6 Ethylene ,. r ....--- .... •-•- Isobutane----•---•-- 2 -- (CHs)3CH , Methyl 2 /a chloride ...............•... CHaCL 10 Methyl foienate_............................ -..... HCOOCH3 q ;. Propane- r; ---.....C3Hs 2 % 4' SECTION 405 — MISCELLANEOUS a All requirements of installations for refrigerant g pi Ping; design and construction of refrigeration r equipment, including pressure ves- sels; relief. devices for use in systems and on pressure vessels, and other requirements not covered by Chapter IV, shall conform to the "American National Standard for Mechanical Refrigerating Equip- ` ment" ANSI B9-1-1971, subject to the approval of the Mechanical Official. 73 SECTION 406 — FIELD TESTS (a) General. Every refrigerant -containing part of every system that is erected on the premises, except compressors, condensers, evap- orators, safety devices, pressure gages, and control mechanisms that are factory tested, shall be tested and proved tight after complete installation, and before operation, at not less than the minimum -re- e-frigerant f rigerantleak field test pressures shown in Table 4-2 or in accordance with Paragraphs (b) and (c): ' The leak test pressure requirements of Table 4-2 are not intended to apply to gas bulk: storage. tanks that are not permanently connected i to a refrigeration system. (See Table 4-2) j (b) Systems erected on the premises using Group 1 refrigerant 1 and with copper tubing not exceeding 5/8 inch O.D., with wall thick- ness as required by Section 405, may be tested by means of the refrigerant charged into the system at the saturated vapor pressure of the refrigerant at 70 F. or higher. (c) Limited charged. systems equipped with a pressure relief device, erected on the premises, shall be tested at a pressure not less ® than 1Y2 times the pressure setting of the relief device. a (d) Test Medium. No oxygen or any combustible gas or combus- tible mixture of gases shall be used within the system for testing. Any inert, non-toxic gas similar to carbon -dioxide or nitrogen, will be acceptable. , (e) The means used to build up the test pressure shall have either a pressure limiting device or a pressure reducing device and a gage on the outlet side. (f) -Posting of Tests. A -dated declaration of test shall be provided � for all systems containing 50 lb. or more of refrigerant, where re- ') quired by Paragraph (a). The declaration shall be mounted in a frame, protected by glass, and posted in the machinery room and shall give _ the name of the refrigerant and the field test pressure applied to the high side and the low side of the system. The declaration of test shall . be signed by the installer and, if an inspector is present at the tests, he shall also sign the declaration. When requested, copies of this dec- laration shall be furnished to the enforcing authority. 74 6783 i 04L, 0 0 0 0 C. 0 o 0 0 0 0 0 0 0 0 to o OLO ul:l 0 -0 10 co co •d' LO O W O L N La -lW rA - H O r! ri L N ,t �{ an LU - - W ,b o 6 Om s tO O O o 0 o O C O o o ItD m 0 .. M m N N co M i- 1(J N CO 'W M . - _ �+•1 r -f ti W N +' N O LU &U .. ~ •nVn aO AJ" O N N N r- N N 'D avMw Ma MT N rri O Ld Ir+j hh�N Il W u W UWGz, r-, =U 1" 11 1.11 M N N 1-� a N n N m LU U vZ4v rJ x v r Q LU i M _ o C a ar O4 H rNDNoilU� a C4 CIS mCd cd d o M +' o oca �"' t1 y Y O' r♦ N N rl d' CG C 47 G G.. ar E o o o o, r R; o. k o o q ,r.{. 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O cC G� M N P ° O Sr F oCD 2 o. o �+ o 0 o WVI +� Cl to m +� i.1 0 0 0 �i Y ° ;q 41 y O PI �+ S-1 V I' .�.y N N y p 4, w U P° o in U1 ° N to a cyd v N o cwt a u r. � O Pi M H F Z 76 6784 CHAPTER V - DUCTS AND DUCT SYSTEMS SECTION 501 — GENERAL This chapter applies to duct systems used for the movement of air or materials in air conditioning, heating, ventilating, exhaust, or conveying systems. All .ducts and ductwork shall conform to the f' standards outlined herein. SECTION 502 — STANDARDS Ducts shall be constructed,: braced, reinforced and installed to Provide structural strength and durability, and when in accordance with the following standards shall be deemed as meeting the intent of this code. Title of Standard Author Designation and Year of Publication Low Velocity Duct Construction ' Standards _ SMACNA—Fourth Edition, 1969 ' High Velocity Duct Construction Standards SMACNA—Second Edition, 1969 Fibrous Glass Duct Construction Standards SMACNA—Third Edition, 1972 : Duct Liner" Application Standard SMACNA-First Edition, 1971 Guide and Data Book—Equipment ASHRAE-1972 SECTION C ON 503 — "CONSTRUCTION OF DUCTS' All ducts shall be constructed of materials and construction qual- ih as set forth for its class .as outlined in Section 502. 1. Residential ducts shall be minimum of Class 2 air duct ma- terial. 2. Commercial ducts shall be minimum Class 1 air duct material but shall not exceed 250 degrees F. temperature, 2000 FPM Velocity, or 2 inches Static Pressure. 3. 1 Industrial or Medium and High Pressure commercial ducts shall be minimum Class 0 of air duct material and shall be used"on applications which exceed 250 degrees F., 2000 FPM or 2 inches SP. ® r 4. Other ducts may be of independent construction or a part of the building structure, provided they are installed using one of the following methods; 77 a. Ductwall construction consisting of not less than %-inch cement or gypsum plaster on metal lath applied to suitable supports may be used as duct walls. b. Duct walls of masonry constructon of proper strength and design. c.. Properly constructed and lined passages of gypsum wall- board may be used as ductwalls for return air or heating ducts in which no condensation is to be encountered. All ducts mentioned herein shall comply with Section 508 where ducts pass through floors... SECTION 504 - FLEXIBLE CONNECTORS Flexible connectors for use between ducts and air outlets or air outlet units, and which do not pass through floors of buildings, need not conform to the requirements for ducts if they conform to the following _provisions_ 1. Connectors not exceeding 8 inches in diameter shall conform to the requirements for Class 2 duct material. 2. Connectors exceeding 8 inches in diameter shall conform to ' the requirements for Class 1 duct material. 3. Flexible connectors shall not exceed 14 feet in length. 4. Flexible connectors shall not pass through a fire wall or fire partition. SECTION 505 — VIBRATION ISOLATION CONNECTORS Vibration connectors in duct systems shall. be made of woven asbestos or approved flameproofed fabric or shall consist of sleeve joints with packing or rope asbestos or other approved non-combus- tible material. Vibration isolation connectors shall not exceed 10 inches in length. 1 SECTION 506 — INSULATION (a) Duct Linings 1. Lining and adhesives for ducts shall have flame -spread rating not over 25 without evidence of continued progressive combus- tion and with smoke developed rating not higher than 50. 2. Tests shall be in accordance with ASTM C411-61 (Hot Surface Performance of High Temperature Thermal Insulation) at a minimum test temperature of 250 degrees F. r8 I" G 6785 3 3. Linings shall be interrupted at the area of operation of a fire damper or fire door. 4. Linings shall be interrupted for a minimum of 18 inches up- stream and 3Q inches downstream (See Duct Coverings - 506(b)) in the vicinity of heat sources in a duct system involv- ing electric resistance or fuel burning heaters. (b) Duct Coverings 1. Thermal Insulation of an approved type with an approved vapor barrier having a flamespread rating of not over 25 and SDR of 50 and of a minimum 1" thickness to prevent sweating shall be provided as follows - A. On air conditioning. supply air ducts where they pass through non air conditioned spaces. Where liner is properly applied no vapor barrier shall be required. B. On exterior of all ducts. where required and where duct. liner has been interrupted (See Duct Lining at fire dam- pers of heating units). 2. All ducts which operate at temperatures in excess of 120 degrees F, shall have sufficient thermal insulation to limit the exposed surface temperature to 120 degrees F. (Vapor barrier not required). SECTION 507 DUCTS IN CONCRETE SLABS 1. Ducts embedded in or under concrete slabs shall be of sufficient structural strength and shall be covered on all sides with not less than 2 inches of concrete properly reinforced. 2. Ducts shall not pass through a beam or girder unless said beam or girder is designed for passage. All ducts shall be sloped to an accessible plenum for drainage of condensate. 4. Ducts shall bey ro erl - sealed and secured p p prior to pouring the concrete encasement. 5. Ducts shall not be installed in such a manner as to impair the ef- fectiveness of the fire -proofing around steel or iron of structural members. SECTION 508 — DUCT SUPPORTS, HANGERS AND SPECIALTIES 1. Ducts shall be suitably protected when placed in locations where they may be subject to damage or rupture. 79 2. Hangers or brackets for supporting ducts shall be of flat metal angle iron, or other approved materials, adequately spaced to securely support, suspend, or hang the ductwork. 3. Ducts passing through walls shall be sealed in accordance with the requirements of NFPA 90B - 1971, Warm Air Heating and Air Conditioning Systems, Residence Type or NFPA 90A -1971 Air Conditioning and Ventilating Systems. 4. Exposed openings in fan housings shall be protected with screens or gratings to prevent accidents or the entry of foreign material. 5. All mechanical equipment shall be provided with guards or protec- tors over rotating components to prevent accidents. 6. Lights or lighting installed within the enclosure of any duct sys- tem shall be enclosed fixtures of the marine (vapor tight) type. Germicidal lamps are not included. ' SECTION 509 - FIRE PROTECTION OF DUCTS 509.1— Fire Doors When a fire wall is of 3 hour or greater fire endurance, a fire door meeting the requirements of U.L. 10(b) -1970 shall be employed. 509.2— Fire Dampers Fire dampers shall be installed under the following conditiong subject to exceptions in Section 509.5. (a) Ducts passing through Occupancy separations. (b) Ducts penetrating fire -rated corridor walls. (c) Duct penetrations.of fire -rated shafts. (d) Ducts penetrating the ceiling of a fire -resistive floor -ceiling assembly. 509.3 —Fire Dampers, Construction of Fire dampers, as required at other than fire walls openings, shall be made of steel of the following gauges: Duct Size-Diameter'or Thickness Long Side -Inches Manufacturers Standard Gage 18 or less 16 ga. 19-36 12 ga. Over 35 7 ga. Fire dampers listed by a nationally recognized testing laboratory shall be used in accordance with the conditions of listing. 80 6'786 ' F ,..._. a r..:lleF:.S:i�a... .�.... �-.l.nrr�a.'5 :?sndeL....n�:.w. S::u.`�i.i.Z....mc.......:...ss�uvl`"., ywJL•':��".�artf:.. b N_1�...(1.aL:�,C��.i... ' Approved . fire clampers shall have the following performance characteristics:. (a) They shall be arranged to close automatically in event of abnormal high temperature 4 (b) They shall provide the maximum practical barrier to passage r of air when in the closed position. (c) They shall remain in the closed position under fire conditions. (d) They shall have resistance to corrosion. l- (e) They shall be so installed as to stay in place at the pro- tected opening, even though the duct is disrupted during a fire, such as by the use of a substantial sleeve or frame secured by perimeter ' r - angles on both sides of the opening. Fire dampers shall be installed ' in accordance with the conditions of their approval and the manufac- I: turer's instructions. (f) Suitable hand hole openings with tightly fitted covers shall be provided to make them accessible for inspection and maintenance. (g) They shall possessa. 11/2 -hour standard fire protection rating in accordance with NFPA No. 252, Standard Method of Fire Tests of Door Assemblies, except for dampers protecting openings in fire - resisting ceilings. (h) Fire dampers provided -in ducts .used, solely for exhaust of air to the outside shall be installed in such a "way that they will not interfere with the flow of air in the main duct. The designer of an air duct system shall show on the plans the location of all automatic fire doors and fire dampers as required by this Code. 509.4—Fire Doors and Fire Dampers —Closing Mechanism Fire doors and fire dampers shall be arranged to close auto- matically and remain tightly closed, upon the operation of a fusible 5; link or other approved heat actuated device located where readily affected by an abnormal rise of temperature in the duct. Fusible links shall have a temperature rating approximately fifty degrees (50) r above the maximum temperature that would normally be encountered " with the systems in operation or shut down. 509.5 — Fire Dampers, Exceptions (a) Fire dampers are not required in ducts having a cross sec- tional area of less than twenty-eight (28) square inches. (b) In small buildings with unprotected floor openings. 81 82 o 1. (c) In duct systems serving only one floor and used only for exhaust of air to the outside and not penetrating a fire wall or par- tition which serves to restrict the spread of fire and is required to have a standard fire resistance rating of not less than two hours, or passing entirely through the enclosure for a vertical shaft. (d) Where branch ducts connect to return risers in which the air flow is upward and subducts at least 22 inches in length .are carried up inside the riser from each inlet. SECTION 510 — AIR FILTERS."'' All heating and air conditioning systems of the central type shall be provided with approved type air filters. Low velocity type filters shall have a face area of not less than 1 square inch for each 2.5 .cubic feet per minute of air circulated by the unit. Filters shall be installed in the return air, upstream from any heat exchanger or coil, in an approved convenient location, and shall be easily accessible for clean- ing or replacement. Filters shall be of a type that will not burn freely or emit large .volume of smoke or other objectionable products of combustion when attacked by flames. Liquid adhesive coatings used on filters shall have a flashpoint not lower than 325 degrees Fahrenheit. SECTION .511 - WEATHERPROOFING All ducts installed outside buildings and exposed to the elements shall be properly weatherproofed in an approved manner. Ducts with internal insulation shall have all joints and seams soldered or other- wise sealed so as to be weathertight. Ducts externally insulated shall have this insulation protected with a covering of sheet metal, weather- ' proof membrane or a mastic coating, all of which shall be applied in an approved manner. SECTION 512 - PLENUM CHAMBERS No room, attic, void, hollow or concealed space shall be used as an integral part of a duct system, or plenum unless the component parts of such space is constructed entirely of non-combustible material, properly protected by means of fire dampers and/or fan cut-off con- . trols so as to restrict the spread of fire, and arranged so as to protect the fire -resistiveness of the assembly. Such chambers shall not be used for storage or occupational purposes. Public exit halls in hotels, hos- pitals, institutions and similar occupancies and in multi -family houses shall not be used as plenums. Stairway enclosures connecting two or more stories shall not be used as plenums. 82 6787 C SECTION 513 = PLENUM FLOOR SYSTEMS 513.1— General } The use of a crawl space as a plenum shall be restricted as pro- vided herein., (a) Such spaces shall have not more than 24 inches nor less than 3 inches clearance between the bottom of the floor joists and sand or concrete cover. Such spaces shall be cleaned of all excess combus- tible material. ` h (b) The enclosing material of the under -floor space, including the side wall insulation, shall have a flame spread classification of not more than 200. (c) Access, if provided to such spaces, shall be through an open- ing in the floor and shall not be greater than 24 inches by 24 inches. 513.2 — Construction Practices (a) Framing. Framing shall comply with the requirements of the Southern Standard Building Code. . (b) Decay and Termite Protection. Where required, preserva- tives shall be of approved water borne type. (c) Soil Poisoning. Chemical soil treatment shall be applied to both sides of the foundation wall from the footing to the grade level. Approved chemicals shall be used. All excavations for plumbing and other services shall be com- pleted at the time of the chemical soil treatment, or retreatment shall be necessary. (d) Vapor Barrier. After the soil has been treated, a vapor bar - vier shall be provided within the foundation perimeter, from wall to wall, with joints lapped two inches but not sealed. The vapor barrier membrane shall be carefully fitted around pipes and drains and turned up at the foundation wall. R� The vapor barrier membrane shall be equal to or greater than polyethylene film of 4 mil thickness. The vapor barrier membrane shall be covered with a 2 inch layer of clean sand or other non-combustible material. (e) Insulation and Sill Sealer. The foundation wall shall be in- sulated along its inner face from the sill vertically to the under -floor plenum grade level and horizontally over the vapor barrier, a distance of two feet. The insulation shall provide a maximum heat loss of 35 BTU per linear foot of perimeter wall above the under -floorspace, as- suming a plenum air temperature of 70 degrees for return and 110 degrees Fahrenheit for supply. 83 ----------- -JA A positive seal' shall be provided at the junction of the house wall -and the foundation. (f) Outlets. Outlets from the plenum shall be provided by one of the following methods:-. .-. (1) An air slot shall be provided at the base of the exterior wall or interior partitions iniaccordance with the recommendations of the National. Forest Products Association... (2) Floor registers shall be designed for easy removal in order to give access for cleaning.. (3) Wall registers shall be connected to the plenum space with. a duct or boot complying with the requirements of this Section. SECTION M4— FRESH AIR INTAKES �. ) Fresh air intakes shall be protected against exterior fire exposure by means of approved fire doors, dampers, or other suitable protection in accordance with the degree of exposure hazard and shall be screened with a corrosion -resistant material not larger than one-half inch mesh. Fresh air intakes shall not be taken from a location closer than ten feet from any chimney or vent outlet, or sanitary sewer vent outlet, unless such vent outlet is not less than eighteen (18) inches above the fresh air inlet. ad 84 CHAPTER VI - PIPING SECTION 601 — GENERAL The provisions of this chapter shall govern the construction, in- stallation, alteration and repair of all heating, cooling and certain process piping for steam, chilled and hot water systems unless other- wise provided for in this code.. SECTION 602 — STEAw AND HOT WATER PIPING 602.1— General All steel and wrought iron pipe shall be at least Schedule 40 pipe, or pipe or tubing of equivalent working pressure and tensile strength. Brass or copper pipe, and copper or steel tubing may be used on hot water installations, if the system is designed to operate within such pipe or tubing working pressure rating. 602.2 — Reaming " All pipe or tubing shall be reamed after cutting to not less than full internal dimensions. .602.3 — Pipe Jointing Steel or -wrought iron piping may be joined by welding or by the use of screw or flanged fittings. Copper or tinned steel tubing may be joined by brazing, soldering or approved compression fittings. 602.4 — Pipe Support Pipe and piping shall be properly hung and supported to permit expansion and contraction. "U" bends, swing joints or expansion joints shall be installed so as to permit free expansion and contraction of the piping. Swing joints of "U" bends shall be fabricated of equivalent pipe material, and shall be suitable for the pressures and temperatures at which the installation is designed to operate. Expansion joints of either the slip sleeve or corrugated copper type may be used where such joints meet the temperature and pressure requirements of the installation. (a) All piping shall be securely supported on substantial non- combustible supports or hangers. Such supports or hangers shall be securely fastened to an adequate support or structural member. The hanger or supports shall be so spaced that there shall be no undue _... stress or strain on the pipe, joints, fittings or valves so that sagging will not occur in the pipe between points of suspension under normal operating conditions. 85 (b) The piping shall be securely fastened to.proper type anchor foundations where necessary to prevent undue stress or strain on boilers or equipment due to weight of the pipe or expansion and contraction. - 602.5— Piping Through Walls, Floors, _Etc l Piping passing through walls, ceilings, floors, in or under con- crete slabs, beams, or any portion of the building structure, shall be free to expand and contract and shall not be embedded in plaster, concrete,or masonry..Such.piping shall be provided with metal sleeves or thimbles when passing through concrete or masonry walls, ceilings, floors or beams, and such sleeves or thimbles shall be at least three- eighths (3/8) inch larger than the outside diameter of the pipe plus the insulation. Openings through wooden floors, ceilings, walls and beams shall be at least three-eighths (3/8) inch larger than the out- j side diameter of the pipe or the pipe plus insulation. When copper tubing is installed in a concrete slab or in the earth below a slab it shall be installed in a sleeve with a diameter not less than three- fourths (3/4) inch greater than the outside diameter of the tubing; the tubing shall be arranged to permit expansion and contraction without damage to the tubing or to the building structure; and all joints shall be made with brazing metals having a melting point of eleven hundred ten (1110) degrees F. or higher. Where steel pipe is installed in a concrete slab or in the earth below a slab, it shall be installed in a casing or conduit, and such steel pipe shall be protected against corrosion. The casing or conduit shall be laid in a straight line and shall extend into accessible portions of the building to permit the removal or insertion of the pipe when the casing or conduit is in place. The Mechanical Official shall approve the type of sleeve and insula- Ar tion to be used on piping carrying steam, water, or other fluids at temperatures. in excess of three hundred (300) degrees F. 602.6 — Vertical Piping Secured Vertical piping shall be secured at sufficiently close intervals to keep the pipe in alignment and carry the weight of the pipe and con- tents but in no case less than at every other story height. 602.7—Branch Main Stress Where the main stream supply or hot water supply piping or the main return piping of a system is divided into two (2) or more branch mains or returns, such branches from the main piping shall be taken off with tees and elbows or "Y" branch fittings, so installed and connected that no undue stresses or strains from pipe expansion or other causes shall be placed on the pipe fittings or threads at the point or points of junction of the piping. 86. ic U L 6789 602.8 — Bull -Heading Tee The use of bull -heading tee connections is prohibited where the side opening of a tee is connected to the main piping and where the two (2) branch connections are taken off of the run of the tee thereby forming a rigid connection. 602.9 Welding Where welding is used as a means of connection or joining branch mains to the main stream piping, provisions shall be made for the expansion of the pipe at this point so that no undue stresses or strains shall be placed on the welds or Piping. The bull -heading or rigid tee is prohibited on this type of connection. 602.10—Connection from Mains, Branch Mains or Return Piping All connections from the mains, branch maim or return piping of a steam system to radiators or to supply risers running to upper floors of a building shall be taken off at the top of the supply or return piping by use of a forty-five (45) degree or ninety (90) degree elbow where fittings are used, or welded into the top of the piping where the welded method of connection is used. 602.11— ColdWater Supply to Hot Water Tank The cold water supply to a hot water tank shall be discharged within three (3) inches of the bottom of the tank either by direct connection at this point or by means of a pipe or tube inside the tank. There shall be installed on the cold water line close to the tank a hand shut-off valve and a vacuum relief valve. The vacuum relief valve shall he installed so that hot water cannot flow back from the tank through the cold water supply piping. (See Southern Standard Plumbing Code.) 602.12 — )Iaterials 602.12.1 All threads on Pipe, fittings, valves, flanges and similar shall conform to American Standard for Pipe Threads, ANSI B2.1 - 1960. 602.12.2 Required gaskets shall be made of material approved for the pres- sure and temperature to which they are to be subjected. Rubber shall not be used where pressures exceed fifteen (15) psig steam and forty- five (45) psig water or on temperatures greater than two hundred fifty (250) degrees F. 602.12.3 Threaded joints shall be made up with an approved thread com- pound or lubricant. 87 602.12.4 Flanges, screw type, cast iron` or steel, or of the forged integral type may be used up to their working pressure and temperature ratings. All companion flanges shall have matching facing and drilling. 602.12.5 All pipe fittings and ,valves . used on. high pressure installation shall be of the type designed for the pressures and temperatures of. the installation. 602.12.6 All pipe and piping used on high pressure -high temperature in- stallations shall be of the required weight and strength suitable for the type service and pressures intended. Stress relieving may be re- quired by the Mechanical Official for high pressure -high temperature ,} welded installations. SECTION 603 CONDENSATE DRAIN PIPING 603.1— General Condensation from all cooling coils or evaporators shall be carried full size from drip pan outlet and piped to a sanitary sewer drain, storm sewer drain or an approved French drain on units larger than three tons nominal capacity. Drains from units three tons and smaller -' capacity may terminate in gutter or roof drain, on a concrete pad or other location subject to approval: of the Mechanical Official. Con- densate drains from roof. top "units may spill on roof providing it does not drain into street or alley, or other area, of sufficient amount to be a menace. lr 603.2 — Material All condensate drain piping shall be galvanized steel, copper pipe or. tubing or plastic pipe. Black steel pipe shall not be used for condensate drains. Condensate waste and drain lines shall be not �. less than three -fourth (3/4) inch size pipe or seven -eighths (7/8) inch tubing size.- When more than one unit is manifolded together for condensate drainage, the pipe or tubing must. be sized in accordance with good engineering practices. 603.3 —French Drain A French drain shall consist of a pit not less than 24 inches in diameter and 24 inches deep filled with coarse gravel. The drain pipe shall extend into the pit not less than 6 inches below grade and securely anchored in place. The drain may be covered with sod if desired after inspection and approval of same. 88 89 6790 a `T' - sfcl i G}z = SECTION 604"—'CHILLED WATER PIPING All chilled- water piping and fittings shall be of wrought -iron,. . steel, copper, brass or polyvinyl chloride plastic, (PVC) Schedule 40 type I and •II high' and normal impact, polyvinyl chloride plastic - (PVC) Schedule 80.type I and II high and normal impact. Pressure rated cement -asbestos epoxy lined pipe may be used where tempera- ture of water does not exceed 210 degrees fahrenheit. The aforemen- tioned materials shall be installed in compliance with Table 6-1. IC 89 6791 (a) Type Ii or L Copper may be used on all underground or undersla brazing filler metal. ab copper lines and joined by (b) Aluminum. Tubing. Type 3003-0 aluminum tubing may. be. used for chilled water piping only. (c) Identification. All piping and fittings shall be marked to . indicatetype, weight 'or pressure as applicable. (d) All pla-tic pipe shall be installed and supported in accordance with the manufacturer's recommendations and in such a manner as to give protection .from physical damage to the piping and shall not - be used as a connection material to heating devices, nor other equip be where temperature and/or vibration could affect the piping. SECTION 605 — CONDENSER WATER PIPING 605.1— General .. , Condenser water piping shall be of the same quality and installed in the same manner as required in Section 604 of this code. ® 605.2 — Bleed -Off All cooling tower bleed -off lines shall be extended to a sanitary • in or storm sewer drain. In no case shalt such drain be sewer ch a allowed to drain into yards, street o r alleys, or on the roof of a build - ing which drains into such an area. t. + 605.3 — Installation f Cooling towers shall be provided with a direct connection to a The 4 ' water supply, through an individual float control valve. control three inches above the highest valve shall terminate not less than possible water level. in the cooling tower pan. A convenient means shall be provided, either a gate valve or a capped nipple, for draining or flushing the . tower. k SECTION 606 — MAKE-UP WATER PIPING From an approved back-flow preventer installed as required by the Southern Standard Plumbing Code, to the inlet on a boiler, chiller, or other water -using device covered by this Code, the piping shall be �- fv as hereinbefore specified for hot and chilled water piping, except on boilers operating above 250 degrees F. or .100 p.s.i. pressure, the make-up water line shall be black iron or wrought -iron pipe conform- ing to Schedule 80 of American Standard on Wrought -Steel and B36.10 and extra -heavy malleable iron fit- ® Wrought -Iron Pipe ANSI tings. `lake -up water piping to chillers or water towers shall be either galvanized steel or copper pipe. 606.1 —Cross -Connections No direct cross -connection shall be permitted between the potable water supply and any other circulating water system.. On closed type systems an approved backflow preventer shall be installed in the water supply line ahead of the control valve. On open type systems, where the water is supplied to an open tank or vessel,, the outlet of the water vL supply shall terminate not less than three inches above the highest possible water level 'in the tank or vessel `Waste water lines shall terminate not less than three inches above floor drain or fixture into which they spill SECTION 607— FUEL PIPING 607.1— Natural Gas Piping-. _ - All natural gas fuel piping shall be sized, installed, tested, and placed in operation in accordance with the requirements of the Sou- thern Standard Gas Code..._; 607.2— Liquefied Petroleum Gas (LPG) Piping , All LPG fuel piping shall be sized, installed, tested, and placed in operation in accordance with .the requirements of the Southern Standard Gas Code. :. 607.3 — Liquid Fuel Piping . 607.3.1—Piping Materials and Design s . (a) All piping shall be wrought iron, steel or brass pipe, or brass or copper tubing except as provided in 607.3.1(b). Wall thicknesses of wrought iron and steel pipe shall be in accordance with design methods outlined in the American Standard on Wrought -Steel and � Wrought -Iron Pipe ANSI B36.10-1959. Listed flexible metal hose r may be used to reduce the effect of jarring and vibration or where rigid connections are impracticable and shall be installed in full com- pliance with its listing. (b) Piping may be of materials other than those specified in 1 607.3.1(a) if used underground. Such piping shall be designed to speci- fications embodying principles recognized as good engineering design for the material used and shall. be approved by the authority having jurisdiction. (c) Piping used in the installation of oil burners and appliances other than conversion range oil burners shall be not smaller than 3/8 in, iron pipe size or 3/8 OD tubing except that 1/4 in. pipe or 5/16 OD tubing may be used in the suction line of systems where the top of the tank is below the level of the oil pump. Copper tubing shall have 0.035 in, nominal and 0.032 in. minimum wall thickness.. 92 K-1 1W W 6'792 (d) Pipe shall be connected with standard- fittings and tubing with fittings of listed type. Pipe connectors made of combustible ma- terials or depending upon the frictional characteristics of combustible materials shall not be used inside of buildings or above ground outside, of buildings. If used below ground outside of buildings, connectors shall be of listed type and installed in accordance with their listing. All threaded joints and connections shall be made tight with suitable lubricant or pike compound- Unions. requiring gaskets or packings, right or left couplings, and sweat 'fittings employing solder having a meltingpoint of less than 1000 degrees F. shall not be used in oil lines. Cast iron fittings shall not be used. (e) Piping shall be substantially supported and protected against physical damage and where_ necessary protected against corrosion. All buried piping shall be protected against corrosion. Drop pipes from shop piping mains to. burners are, subject to physical damage and it may be necessary to enclose them in heavier pipe or the equivalent means to safeguard. against. breakage., � : �.. I M Proper allowance shall be made for expansion, contraction, jarring and vibration. Pipe lines other than tubing, connected to underground 'tanks, except straight fill lines and test wells, shall be provided with double swing joints, flexible connectors, or otherwise arranged to permit the tanks to settle without. impairing the tight -I nets of the pipe connections. 607.3.2—Fill and Return Piping (a) A fill pipe shall terminate outside of a building at a point at least two feet from any building opening at the same or lower level. A fill pipe shall terminate in a manner designed to minimize spilling when the -filling hose is disconnected. Fill opening shall be equipped with a tight metal cover designed to discourage tampering. -ner or pump to k shall a supply tank (b) A return line from a bui n enter the top of the tank. (c) Cross connections, except between two, supply tanks not ex- ceeding 660 gallons (550 Imp. gallons) aggregate capacity, permitting gravity flow from one tank to another shall be prohibited. (d) An auxiliary tank shall be filled by a pump transferring the Oil from the supply tank. (e) An auxiliary tank shall be located at a level above the top of the supply tank from which it is filled. (f) A, auxiliary tank shall be provided with an overflow pipe drainage to the supply tank and extending into the top of the supply tank not more than one inch. This requirement does not apply to an auxiliary tank specifically listed for use without an overflow pipe. (g) An overflow pipe from an auxiliary tank and a return line from a burner or pump shall have no valves or obstructions. 93 607.3.3—supply Connections (a) All piping, except the burner supply line from a tank having a capacity not over 660 gallons (550 Imp. gallons) and the cross connection between two tanks having an aggregate capacity of 550 gallons or less, shall be connected into the top of a supply tank. When two tanks are cross connected, the tops of the 1 tanks shall be on the same horizontal plane:_ - (b) The burnersupply connection to a tank having a capacity of more than 660 gallons (550 Imp. gallons) or to two or more tanks having an aggregate - capacity' of more than 660 gallons (550 Imp: gallons) shall be connected into the top of each tank, mitted by 607.3.3(f).:,...:_ except as per- (c) A transfer pump or an automatic pump may be used to deliver oil from a supply tank to a burner or to an auxiliary tank. Except as permitted by 607.3.3(f), a transfer pump shall not be con- nected to a tank having a capacity over 660 gallons (550 Imp. gallons) or to two tanks having an a. g ggregate capacity of over 660 gallons (550 Imp. gallons). "..- (d) The pressure at the oil supply be greater than 3 psi inlet to an appliance shall not (e) Where supply tanks are set below the level of the burner, ' the oil piping shall be so Iaid as to pitch toward the supply tank without traps. (f) For commercial and industrial. installations the oil supply from tanks of any capacity permitted by this Standard may be in accordance with the following; (1) The burner supply line may be connected to an outside above- ground supply tank at a point below the liquid level but each such connection shall be provided with an internal or external i. shutoff valve located as close as practicable to the shell of the tank. External valves and their ' connection to the tank shall be of steel. . (2) A'transfer pump may be used. 607.3.4 —Liquid Fuel Vent Piping l (a) Liquid fuel ventPipes shallid as to drain so acan tank without sags or traps in hiichbliquide collect They shall be located so that they will not be subjected to physical damage above- ground. Vent pipes from tanks may be connected into one outlet pipe. The outlet pipe shall be least at one pipe size larger than the largest individual vent pipe connected thereto. In no case shall the point of connection between two or more vent pipes be lower than the top Of any fill pipe opening. The lower end of a vent pipe shall enter the tank through the top and shall extend into the one inch. tank not more than 94 V (b) Liquid fuel vent pipes shall terminate outside of buildings at a point not less than two feet measured vertically or horizontally from any building opening. Outer ends of vent pipes shall terminate in a weather-proof vent cap or fitting or be provided with a weather- proof hood. All vent caps shall have a minimum free open area equal to the cross-sectional area, of the vent pipe and shall not employ screens finer than four mesh. Vent pipes shall terminate sufficiently above the ground to avoid being obstructed with snow and ice. Vent pipes from tanks containing heaters shall be extended to a location where oil vapors discharging from the vent will be readily diffused. If the static head with a vent pipe filled with oil exceeds 10 psi, the tank shall be designed for the maximum .static head which will be imposed. (c) Liquid fuel vent pipes shall not be cross connected with fill pipes, returnlines from burners or overflow lines from auxiliary tanks. 607.3.5 —Pressurized Tank Feed Air or other gases shall not be used to pressurize tanks. 607.3.6 —Oil Gauging (a) All tanks in which a constant oil level is not maintained by an automatic pump shall be equipped with a method of determining the oil level. (b) Test wells shall not be installed inside buildings. For outside service they shall be equipped with a tight metal cover designed to discourage tampering: The gauging of inside tanks by means of measuring sticks is a pronounced hazard and shall not be permitted. (c) Gauging devices such as liquid level indicaters or signals shall be designed and installed so that oil vapor will not be discharged into a building from the liquid fuel supply system. NOTE: An inside tank provided with fill and vent pipes shall be provided with a device to indicate either visually or audibly at the fill point when the oil in the tank has reached a predetermined safe level. (d) No tank used in connection with any oil burner shall be equipped with a glass gauge or any gauge which when broken, will permit the escape of oil from the tank. 607.3.7—Valves (a) A readily accessible manual shutoff valve shall be installed at each point where required to properly control the flow of fuel in normal operation and where required to avoid oil spillage during servicing. The valve shall be installed to close against the supply. 95 w An automatically operated device designed to shut off the oil supply in case of fire in the immediate vicinity of the burner shall be provided. (b) Where a shutoff is. installed in the discharge line of an oil pump not an integral part of 'a burner, a. pressure relief valve shall he connected into the discharge line between the pump and the shutoff` valve and arranged to return surplus oil to the supply tank or to by- pass it around the pump, unless the pump includes an internal bypass. (c) Any fuel oil line incorporating a heater shall be provided with a relief valve arranged to discharge to the return line when any valve, pump, or other device may prevent the release of excessive pressure '- because of the expansion of the oil when heated. (d) Where oil is supplied to a burner requiring uniform flow by gravity feed and a constant level valve is not incorporated in the burner assembly or the oil is not supplied by an automatic pump, a constant level valve shall be installed in the supply line at the gravity tank or close thereto as practicable, to insure uniform delivery of oil to the burner. The vent opening of such constant level valve shall be connected by piping or tubing to the outside of the building, un- less the constant level is provided with an antiflooding device. Vent piping or tubing of constant level valves shall not be connected to tanks or tank vents. - SECTION 608 — REFRIGERANT PIPING (a) All refrigerant piping shall be sized,- installed, tested, and placed in operation in accordance with Chapter IV of this code and the "American National Standard for Mechanical Refrigerating Equip- ment" ANSI 139-1-1971. (b) Rigid or flexible metal enclosures or pipe ducts shall be pro- vided for soft, annealed copper tubing used for refrigerant piping ` erected on the premises and containing other than Group 1 refrigerants. No enclosures shall be required for connections between condensing unit and the nearest riser box, provided such connections do not ex- ceed 6 feet in length.. } (c) Specified Minimum Requirements for Refrigerant Pipe and Tubing. (1) No less than Schedule 80 wall thickness carbon steel or wrought iron pipe shall be used for Group 2 and Group 3 refrigerant liquid lines for sizes 11/z inches and smaller. No less than Schedule 40 wall thickness carbon steel or wrought iron pipe shall be used for Group 1 refrigerant liquid lines sizes 6 inches and smaller, Group 2 and Group 3 refrigerant liquid lines sizes 2 inches through 6 inches, and Group 1, Group 2, and Group 3 refrigerant vapor lines 6 inches and smaller. 96 a 6794 Butt -Welded carbon steel and butt -welded wrought iron pipe shall not be used for refrigerant liquid lines. Cast iron pipe shall not be used for Group 1, Group 2, or Group 3 refrigerant lines. (2) Standard iron pipe size copper and red brass (not less than 80 per cent copper).pipe may be used and shall conform to American Standard for Seamless Copper Pipe ANSI H26.1- 1963 and American Standard for Seamless Red Brass Pipe A1SI H 27.1-1963. (3) Watertube size hard copper tubing.used for refrigerant pip- ing erected on the premises shall conform to American Standard for Seamless Copper Water Tube, ANSI H 23.1-1967 for dimensions and specifications, except that copper tubing With outside diameter of 1/4 inch and 3/8 inch shall have a minimum nominal wall thickness of not less than 0.030 inch and 0.034 inch, respectively. (4) Soft annealed copper tubing used. for refrigerant piping erected on the premises shall not be used in sizes larger than 1%-. inch Standard size (1.375 outside diameter). Mechanical joints shall not be used on soft annealed copper tubing on sizes larger than 7/8 inch standard size (0.875 outside diam- eter). It shall conform to American Standard for Seamless Copper Tube for Refrigeration Field Service, ANSI 1123.5- 1957. (5) Copper tubing jo;nts used in refrigerating systems contain- ing Group 2 or Group 3 refrigerants shall be brazed. Soldered joints shall not be used in such refrigerating systems. (6) Type 3003-0 Aluminum, tubing with high pressure fittings. may be used with all refrigerants except methyl chloride, and those others known to attack aluminum. (d) Joints and Refrigerant -Containing Parts in Air Ducts. Joints and all refrigerant -containing parts of a refrigerating system located in an air duct of an air-conditioning system carrying conditioned air to and from humanly occupied space shall be constructed to with- stand, without leakage, a temperature of 700° F. (e) Exposure- of Refrigerant Pipe Joints. Refrigerant pipe joints erected on the premises shall be exposed for visual inspection prior to being covered or enclosed. (f) Stop Valves (1) General Requirements. All systems containing more than 6 pounds of a Group 2 or 3 refrigerant, other than systems. utilizing non -positive displacement compressors, shall have stop valves installed as follows: 97 (a) Each inlet of each compressor, compressor unit, or con- densing unit; (b) Each discharge outlet of each compressor, compressor unit, or condensing unit, and of each liquid receiver. (2) Systems containing 100 Pounds or More of Refrigerant. All systems containing 100 pounds or more of a refrigerant, other than systems utilizing nonpositive , displacement corn - pressors, should have stop valves, in addition to those in Paragraph (1), on each inlet of each liquid receiver except that none shall be required on the inlet of a receiver in a condensing unit nor on the inlet of a receiver which is an . integral part of the condenser. .: (3) Stop Valves used with soft annealed copper tubing or hard drawn copper tubing 7/8 inch standard size (0.875 outside diameter) or smaller shall be securely mounted, independent of tubing fastenings or supports. (4) Stop Valves shall be suitably labeled if their purpose is not obvious. Numbers may be. used to label the valves provided a key to the numbers is located near the valves. o (g)Location of Refrigerant Piping. -- (1) Refrigerant Piping crossing an open space which affords pas- sageway in any building shall be not less than 71/z feet above the floor unless against the ceiling of such space. (2) free passageway shall not be obstructed by refrigerant pip- ing. Refrigerant piping shall not be placed in any elevator, dumbwaiter, or other shaft containing a moving object; or in any shaft which has openings to living quarters or to main = exit hallways, Refrigerant piping shall not be placed in public hallways, lobbies, or stairways, except that such re- frigerant piping may pass across a public hallway if there are no joints in the section in the public hallway, and pro- vided nonferrous tubing of 1 inch nominal diameter (l1s inch outside diameter) and smaller be contained in a rigid -� metal pipe. SECTION 609 = TESTS AND INSPECTIONS No work shall be concealed prior to inspection and tests. All pipe, except cast-iron and plastic as approved in this code, shall be tested with nitrogen, compressed air or other inert gas (not oxygen) or hydrostatically at a minimum of one and one-half (11/) times the operating pressure. Cast-iron pipe shall be tested hydrostatically only. Approved plastic piping shall be tested at 11/'2 times the operating pressure of the system. 98 6795 CHAPTER V11 - INCINERATORS SECTION 701 — SCOPE AND PURPOSE L ` (a) Scope. The application of this Chapter is intended to insure the safe design, .construction,` installation, repair, maintenance, and operation of incinerators, (b) Purpose. The purpose of this Code is to provide minimum standards to saf3guard life or limb, health, property, and public wel- fare by regulating and controlling the design, construction, quality, of materials, use, location.and maintenance of all incinerators. SECTION 702 — GENERAL REQUIREMENTS FOR NEW AND ALTERED INSTALLATIONS . The installation and alteration of incinerators shall be governed by all applicable provisions of this Code. SECTION 703 — APPROVED EQUIPMENT. ® (a) Standards. Construction and installation of equipment and appurtenances complying with the Incinerator Standards of the Incin- erator Institute of America, dated November 1968, and operation of incinerators in accordance with incinerator Operator's Manual of the Incinerator Institute of America, dated March 1968, and not in con- flict with this Code, will be approved. (b) Equipment designed and constructed as controlled air pack- aged units and having complied with the Incinerator Institute of America Standards recommended velocity profiles in a physical ar- rangement that permits established mixing, combustion, and separa- tion paramaters that results in stack emissions acceptable to the Environmental Protection Agency or state, or local governing agencies will be approved for installation and operation under this Code. SECTION 704 - ALTERNATE MATERIALS AND METHODS Existing Premises. In existing buildings or premises in which - incinerator installations are to be altered, repaired, or renovated, the Mechanical Official may permit deviations from the provisions of this Code provided that such deviations are in keeping with the intent of _ the Code to protect the health, safety and welfare of the occupant of such _ premises and the general public. SECTION 705 — LOCATIONS AND CLEARANCES 705.1— Location All commercial and industrial incinerators installed indoors shall be located in rooms separated from the rest of the building by a 99 . v. minimum of ,one-hour fire -resistive construction. More restrictive requirements may be required due to occupancy or building type classification which may be determined by reference to the Southern Standard Building Code. In one and two family dwellings, residential type incinerators. ne@d not be in a separate room. Outdoor installation of incinerators shall be so located as not to introduce any direct exposure to adjacent buildings, structures, or out- side permanent storage areas of combustible material while the incinerator is in operation. SECTION 706 — CLASSIFICATION Or INCINERATORS � r Incinerators shall be classified as follows: (a) Class I—Portable, packaged, completely assembled, direct- fed incinerators, having not over 5 cu. ft. storage capacity, 25 lbs. % 1 or per hour burning rate, suitable for Type 2 Waste. (b) Class IA -Portable, packaged or job -assembled, direct -fed . incinerators 5 cu. ft. to 15 cu. ft. primary chamber volume; or a burn- ing rate of 25 lbs. per hour up to, but not including; 100 lbs. per hour of Type 0, Type 1, or Type 2 Waste; or a burning rate of 25 lbs. per hour up to, but not including, 75 lbs. per hour of Type 3 Waste. (c) Class II—Fuel-fed, single chamber incinerators with more than 2 sq. ft. burning area,.suitable for Type 2 Waste. This type of incin- erator is served by one vertical flue functioning both as a chute for charging waste and to carry the products of combustion to atmosphere. This type of incinerator installed in apartment houses or multiple dwellings not more than five stories high. THIS TYPE OF INCIN- ERATOR IS PROHIBITED. (d) Class IIA—Chute-fed multiple chamber incinerators, with more than 2 sq. ft. burning area, suitable for Type 1 or Type 2 Waste. (Not recommended for industrial wastes). This type of incinerator is served by a vertical chute for charging wastes from two or more floors above the incinerator and a separate flue for carrying the products of combustion to atmosphere. (e) Class III—Direct-fed incinerators with a burning rate of 100 lbs. per hour and over, suitable for Type O, Type 1 or Type 2 Waste. (f) Class IV—Direct-fed incinerators with a burning rate of ' 75 lbs. per hour or over, suitable for Type 3 Waste. (g) Class V—Municipal incinerators suitable for Type O, Type 1, Type 2 or Type 3 Wastes, or a combination of all four wastes, and are rated in tons per hour or tons per 24 hours. 100 G n V 6.796 (h) Class VI—Crematory and pathological incinerators, suitable for Type 4 Waste. (i) Class VII—Incinerators, designed for specific by-product wastes, Type 5 or Type 6. SECTION 707 — CLASSIFICATION OF WASTE Classification of waste shall be as follows (a) Type O—Trash, a mixture of highly combustible waste such, as paper, cardboard, cartons, wood boxes, and combustible floor sweep- ings, from commercial and industrial activities. The mixtures contain up to 10% by weight of plastic bags, coated paper, laminated paper, treated corrugated cardboard, oily rags and plastic or rubber scraps. (b) Type 1—Rubbish, a mixture of combustible waste such as paper, cardboard cartons, wood scrap, foliage and combustible floor sweepings, from domestic, commercial and industrial activities. The mixture contains up to 20% by weight of restaurant or cafeteria waste, but contains little or no treated, plastic or rubber wastes. (c) Type 2—Refuse, consisting of an approximately even mixture of rubbish and garbage by weight. a This type of waste is common to apartment and residential occu- pancy, consisting of up to 50% moisture, 7%incombustible solids, and has a heating value of 4300 BTU per pound as fired. (d) Type 3—Garbage, consisting of animal and vegetable wastes from restaurants, cafeterias, hotels, hospitals, markets, and like in- stallations. This type of waste contains up to 790 moisture, up to 5% incom- bustible solids, and has a heating value of 2500 BTU per pound as fired. (e) Type 4—Human and animal remains, consisting of carcasses, organs, and solid organic wastes from hospitals, laboratories, abat- toirs, animal pounds, and similar sources, consisting of up to 851yo moisture, 5% incombustible solids, and having a heating value of 1000 ETU per pound as fired. (f) Type 5—By product waste, gaseous, liquid or semi-liquid, such as tar, paints, solvents, sludge, fumes, etc., from industrial operations. ETU values must be determined by the individual ma- terials to be destroyed. (g) Type 6—Solid by-product waste, such as rubber, plastics, wood waste, etc., from industrial operations. BTU values must be determined by the individual materials to be destroyed. 101 SECTION 708 — GAS-FIRED INCINERATORS (a) Clearances. Listed gas-fired incinerators shall be installed as close as practicable to a vent and with at least 12 inches clearance be- tween sides and combustible construction, except that appliances approved for installation at lesser clearances may be installed in ac- `- cordance with their listing. In no case shall the clearance be such as to interfere with the requirements for combustion air and accessibility. Incinerators of the wall . type shall be installed in a non-combustible wall communicating directly with a chimney flue. (b) Flue Pipe Connection. No draft hood shall be connected into 1 a flue pipe of an incinerator. Where conditions permit, it is preferable to have the flue pipe connected to a separate chimney flue. (c) Flue Pipe Clearance. Flue pipes shall have at least 18 inches clearance from combustible construction and shall not pass through combustible construction unless guarded at the point of passage. (d) Flue Pipe Materials. The flue pipe from an incinerator to a vent shall be galvanized steel of a thickness at least No. 24 U. S. Standard Gage or of material having equivalent or superior heat and corrosion -resistant properties, and the joints shall be secured by sheet metal screws. (e) Automatic Pilot Devices. Automatic pilot devices having a response time of not more than 5 seconds shall be installed on all gas burners in unlisted 'commercial incinerators installed in buildings. SECTION 709 - GAS BURNERS (a) Gas burner equipment up to, but not exceeding, 400,000 BTU per hour may be of either the atmospheric or power burner type. In either case, a continuous burning or intermittent stable pilot adequate to ensure safe, reliable ignition shall be installed. A flame safeguard shall be used so that no gas can flow to the main burner unless satis- factory ignition is assured. The . response time of this flame safe- guard to de -energize the gas shut-off device on flame failure shall not not exceed 240 seconds. (b) Above 400,000 BTU per hour input, the burner equipment shall be of the power type which utilizes a forced draft blower to supply air needed for combustion under controlled conditions. A con- tinuous burning or intermittent pilot shall be used to ensure safe and reliable ignition. Automatic spark ignition shall be used on pilots for burners with input . above 1,000 000 BTU per hour. A suitable flame safeguard shall be utilized so that no gas can flow to the main burner . unless satisfactory ignition is assured. On burners with inputs from 400,000 to 1,000,000 BTU per hour, the response time of the flame safeguard to de -energize the gas shut-off device on flame failure shall 102 n U O 6797 not exceed 240 seconds. In capacities above 1,000,000 BTU per hour, the response time of the aforementioned flame safeguard shall be not more than four seconds, (c) The burner assembly shall consist of the main burner, pilot burner, automatic valve, the necessary manual valves and accessory equipment, plus interconnecting pipes and fittings with provision for rigid mounting. The burner shall be constructed so that parts cannot be incorrectly located or incorrectly fitted together. Power burners sealed to incinerator wall with capacities above 100,000 BTU per hour shall be supplied with a means of providing air supply before the main. gas valve can be energized. (d) Electrical motors over 1/12 horsepower on power burner equipment shall be designed for continuous duty and shall be pro- vided with thermal overload protection, or current -sensitive devices. (e) When a complete automatic pilot shut-off system is utilized, the controls shall be readily accessible and arranged so that the main burner gas can be manually shut off during lighting of pilot. When a complete automatic system is not utilized, a readily -accessible manu- ally -operated, quarter -turn lever handle, plug type valve shall be provided to shut off or turn on the gas supply to the main burner manifold. This valve shall be upstream from all controls except the pilot control valve. ' (f) For additionalgas requirements, see Southern Standard Gas Code. SECTION 710 — SCRUBBER OR GAS WASHER (a) The total dust emissions from the flue gas scrubber shall be not more than 0.40 lbs, dry dust per 1,000 lbs, flue gas, corrected to 50610 excess air. (b) The scrubber may be separate from or an integral part of the incinerator, but no internal volume of the scrubber shall be included as a part of the incinerator internal volume. Lined (c) scrubbers shall have a welded or gasketed casing of not less than No. 12 gauge steel. The density of the refractory lining shall not be less than 120 lbs. per cubic foot. The thickness of the refractory shall in no case be less than two inches and adequately anchored to the casing. (d) All scrubbers requiring an induced draft fan shall have the motor horsepower sized for cold start-up (70). All induced draft fans . with the impeller in the flue gas stream must be equipped with a cleanout door and drain. (e) All scrubbers shall be equipped with an access door for cleanout. 103 104 (f) The induced. draft fan, if provided, shall be interlocked with the sprays. (g) A damper shall be located either between the incinerator and scrubber, or at the inlet of the induced draft fan, with a by-pass ar- rangement of breechings or, flue connections to by-pass the scrubber and induced draft fan. SECTION 711 = STACKS AND CHIMNEYS (a) Masonry Chimneys. Masonry chimneys for commercial and industrial type incinerators shall be designed and constructed in ac= cordance.,with the requirements of Chapter III. (b) Metal Stacks. of Flues. Metal stacks shall be designed and constructed as specified in Chapter III. CaSECTION 712 :SPARK ARRESTORS All chimneys and stacks shall terminate in a spark arrestor. Spark arrestor shall be constructed of Series.300 stainless steel wire of not less than .063" diameter. Wire shall be woven in a mesh with wire spacing of. not less than three equal spaces per inch. ..:.,,!_SECTION 713 MARKING INCINERATORS A name plate shall be conspicuously fastened to the incinerator indicating the, manufacturer's name, model number, rated capacity of the unit, .classification and` the type of waste for which the incinera- tor is designed. SECTION 714 — OPERATION OF INCINERATOR 'The incinerator operator'shall follow the written operating in- structions of the manufacturer. A copy of these instructions shall be submitted for approval to the Mechanical Official at the time of application of the permit. Ah 104 0 'L 6798 > , 1 R CHAPTER Vlll - ELECTRICAL REQUIREMENTS SECTION 801 — ELECTRICAL CONNECTIONS All electrical connections between fuel -fired appliances, mechani- cal equipment, etc. and the building wiring shall conform to the National Electrical Code, ANSI C1-1971. A disconnecting means shall be installed within sight and easy reach in the ungrounded leads of each power circuit to electrically operated components which are in unprotected locations and in other locations not readily accessible for service. SECTION 802 — ELECTRICAL IGNITION AND CONTROL DEVICES No devices employing or depending upon an electrical current shall be used to control or ignite a fuel supply if of such a character that failure of the electrical current could result in the escape of unburned fuel or in failure to reduce the supply of fuel under condi- tions which would normally result in its reduction unless other means are provided to prevent the development of dangerous temperatures, pressures or the escape of fuel. SECTION 803 — ELECTRICAL GROUND The fuel piping system shall not be used as a grounding electrode for an electric fuse panel, telephone circuit or lightning arrestor. Elec- tric circuits shall not utilize fuel piping, casing of controls, panels or other metal parts in lieu of an electrical conductor. This provision shall not apply to low voltage control and ignition circuits, and to electronic flame detection device circuits incorporated as part of the appliance - SECTION 804 — ELECTRICAL CIRCUIT The electrical circuit employed for operating the automatic main fuel control valve, safety shut-off device, room temperature thermo- stat, limit control or other electrical devices used with a fuel -burning appliance shall be in accordance with the wiring diagrams supplied with the appliance. SECTION 805 — CONTINUOUS POWER All fuel -burning appliances using electrical controls shall have the controls connected into a permanently live electrical circuit, i.e., one that is not controlled by a light switch. 105 m d F V C: ,y C 'i� S