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216357,t ORDINANCES a .•i'/ri8inal to City Clerk � 11 4 Qouncil File No. 218357- 0rdinance No. 12664 —By Frank L. Loss— � ORDIN m Ordinance mending Chapters If i.►d 6 20 ,+ a the Saint Paul Legi•� °atsa ?a- :t ^in9ng to `4 � NO. '3 ap gc Frank Loss ��alr 3 ' -"' ` }-e F PRESENTED BY • ` 6RDINANCE NO 1 _JrN� JU :0 nc IL C„ ) Z II11je V An ordinance amending Chapters 16, 18, 19 and 20 of the Saint Paul Legislative Code pertaining to Building Construc- tion. This is an emergency ordinance rendered necessary for the preservation of public peace, health and safety. THE COUNCIL OF THE CITY OF SAINT PAUL DOES ORDAIN: Section 1 - That Section 16.04 Technical Regulations for ,Gas Burner Installations of Input Capacity 400,000 BTU per Hour and Smaller is hereby amended by deleting subsection 7 Ventilation, which reads as follows: 7. Ventilation. Gas burners and gas burning appliances as hereinbefore defined shall not be installed for operation in a room where the normal, facilities for ventilation do not permit, proper combustion of the gas, unless special provision is made for supplying sufficient air for complete combustion. and add the following in lieu thereof: 7.. Ventilation Gas burners and gas burning equipment as hereinbefore defined shall not be installed for operation in a room where the normal facilities for ventilation do not permit proper combustion of gas, unless special provision is made for supplying sufficient air for complete combustion as ' provided in Section 16.07 Provisions For Combustion Air and Equipment Room - Ventilation For Gas Fired Equipment. - Section 2 - That Section 16.04 Technical Regulations For Gas Burner Installations of Input Capacity of 400,000 BTU Per Hour And Smaller is hereby amended by deleting subsection 11 Flue Pipes, which reads as follows: 11. Flue Pipes, a. The internal cross - sectional area of the flue pipe between the appliance and the chimney liner shall be such as to provide not less than one (1) square inch of flue area per 7,500 hourly BTU input. In no case shall this flue Pipe be less than five (5) inches'in diameter for cen- tral heating gas appliances nor less than four (4) inches in diameter for space heating appliances and it shall not be larger than the`next integral inch diameter above the size given in the following Table No. 1. 32/ ql�, Yeas Councilmen Nays Passed by the Council Dalglish Holland Loss Tn Favor Mortinsan Peterson Against Rosen Mr. President (Vavoulis) Approved: Attest: t City Clerk .Xayor 1M 6-62 -060-22/, 4 a ` 'Vrl$inal to- City Clerk r V� t ORDINANCE COUNCIL FILE NO PRESENTED BY ORDINANCE NO. /"� to � ation of Residence `hype Warm Air Heating and Air Condition- ing Systems are hereby adopted by reference as requirements for Warm Air Heating-And Ventilation work in the City of Saint Paul with additions and exceptions as provided herein. Section. 11 - This ordinance is hereby declared to be an emergency ordinance rendered necessary for the preservation of public peace, health, and safety. _ Section 12 - This ordinance shall take effect and be in force from and after its passage and publication. Yeas Councilmen Nays Dalglish Holland Loss Mortinson Peterson Rosen Mr. President' (V is) Attest : • ,.. City Clerk 1111 6-62 22 10 FEB 131964 Passed by the Council Tn Favor 6 Against 1 FEB 131964 IL Mayor 14 t:� +fir r.+k J,. -i _._.. �.?�"� ^-• `� Duplicate tp Printer ORDINANCE PRESENTED BY Frank L. Loss COUNCIL FILE NO. (� Ivy,a 51 ORDINANCE NO. 6�- An ordinance amending Chapters 16, 18, 19 and 20 of the Saint Paul Legislative Code pertaining to Buildincf Construc- tion. This is an emergency ordinance rendered necessary for the preservation of public peace, health and safety. THE COWCIL OF THE CITY OF SAINT PAUL DOES ORAAINs Section 1 - That Section 16.04 Technical Regulations for Gas Burner Installations of Input Capacity 400,000 BTU per Hour and Smaller is hereby amended by deleting subsection 7 Ventilation, which reads as follows: 7. Ventilation G burners and gas burning appliances as hereinbefore defi d shall not be installed for operation in a room where, the normal facilities for ventilation do not permit propat combustion of the gas, unless special provision is madeifor supplying sufficient air for complete combustion. and adck. the following in lieu thereof: 7 Ventilation G burners and gas burning equipment as hereinbefore defi�d shall not be installed for operation in a room where'!the normal facilities for ventilation do not permit proper combustion of gas, unless special provision is made for supplying sufficient air for complete combustion as provided in Section 16.07 Provisions For Combustion Air and Equipment Room,Ventilation For Gas Fired Equipment. Section 2 That Section 16.04 Technical Regulations For Gas Burner Installations of Input Capacity of 4000000 BTU Per Hour And Smaller is hereby amended by deleting subsection 11 Flue Pipes, which reads as follows: 11. Flue Pipes a. The internal cross - sectional area of the flue pipe between the appliance and the chimney liner shall be such as to provide not less than one (1) square inch of flue area per 7,500 hourly BTU input. In no case shall this flue Pipe be less than five (5) inches in diameter for cen- tral heating gas appliances nor less than four (4) inches in diameter for space heating appliances and it shall not be larger than the next integral inch diameter above the. size given in the following Table No. 1. Yeas Councilmen Nays Dalghsh Holland Loss Mortinson ` Peterson Rosen Mr. President (Vavoulis) Attest: City Clerk 1M 6-62 22 Passed by the Council Approved: Mayor Tn. Favor Against nnpllexta to Printer PRESENTED BY ORDINANCE COUNCIL FILE NO. ORDINANCE NO. ation.of Residence Type Warm Air Heating and Air Condition - ing Systems are hereby adopted by reference as requirements for Warm Air Heating And Ventilation work in the City of Saint Paul with additions and exceptions as provided herein. Section 11 - This ordinance is hereby declared to be an emergency ordinance rendered necessary for the preservation of public peace, health, and safety. Section 12 -'this ordinance shall take effect and be in force from and after its passage and publication. Yeas Councilmen Nays Dalglish Holland Loss Mortinson Peterson Rosen Mr. President (Vavoulis) Attest: City Clerk 1D1 8-82 X22 V 10 Passed by the Council �+ 7 In Favor Aroainst I Z 7v� Approved: Mayor TABLE N0. 1 MINIMUM PERMISSIBLE FLUE SIZES FOR GAS BURNER INSTALLATIONS NOTES: (1) This table is based on one (1) sq. in. of flue area per 7,500 BTU per hour input. (2) If flue pipe exceeds ten (10) feet in length or contains more than two elbows, use next size pipe and draft hood. (3) In cases where the outlet from the appliance is larger than the above indicated size, an orifice plate may be inserted, or a section of the flue pipe restricted' to the size indicated. (4) In special cases with high chimneys or flues, the above schedule or areas may be modified subject to specific approval by the Bureau. r b. The draft hood should ordinarily be located adjacent to the appliance. In cases where it appears desirable to place the draft hood at a distance from the appliance, the size of the restricted section may be modified according to the length and rise of the flue pipe. c. The proportioned section of the flue outlet of the appliance eliminates the necessity of using an adjustable damper in the flue pipe and -such damper will not be permit- ted. d, Where dampers are an integral part of the boiler or furnace, they shall be removed or permanently secured in the_ wide open position, except such dampers, the function of which is to alter the passage of flue gases through the appliances, which shall be locked in such a position as not to interfere with the normal operation of the burners. e. Material used for flue pipe shall be such as to re- sist the corrosive action of flue gases. f. Flue pipe of existing systems shall be relocated where necessary and new flue pipe.installations shall be made as to avoid sharp turns or other constructional features which would create excessive resistance to the flow of the -2- Area Of Diameter of Input Rating Flue Outlet Flue Pipe (BTU per Hour) (Sq. In.) (Inches) 94,500 12.6 4 147,000 19.6 5 J f 212,250 28.3 6 288,750 38.5 7 377,250 50.3 8 477,000 63.6 9 NOTES: (1) This table is based on one (1) sq. in. of flue area per 7,500 BTU per hour input. (2) If flue pipe exceeds ten (10) feet in length or contains more than two elbows, use next size pipe and draft hood. (3) In cases where the outlet from the appliance is larger than the above indicated size, an orifice plate may be inserted, or a section of the flue pipe restricted' to the size indicated. (4) In special cases with high chimneys or flues, the above schedule or areas may be modified subject to specific approval by the Bureau. r b. The draft hood should ordinarily be located adjacent to the appliance. In cases where it appears desirable to place the draft hood at a distance from the appliance, the size of the restricted section may be modified according to the length and rise of the flue pipe. c. The proportioned section of the flue outlet of the appliance eliminates the necessity of using an adjustable damper in the flue pipe and -such damper will not be permit- ted. d, Where dampers are an integral part of the boiler or furnace, they shall be removed or permanently secured in the_ wide open position, except such dampers, the function of which is to alter the passage of flue gases through the appliances, which shall be locked in such a position as not to interfere with the normal operation of the burners. e. Material used for flue pipe shall be such as to re- sist the corrosive action of flue gases. f. Flue pipe of existing systems shall be relocated where necessary and new flue pipe.installations shall be made as to avoid sharp turns or other constructional features which would create excessive resistance to the flow of the -2- -flue gases. Flue pipes shall slope upward to chimney. / �o g.. Flue pipe shall be tightly connected to the chimney liner,. so as to prevent infiltration of cold air. h. No baffles shall be applied which will interfere with the proper combustion of the gas. i. Flue pipe shall be well supported to prevent sag- ging and shall not be installed closer than six (6) inches to any combustible building materials unless flue pipe is covered with incombustible insulation such that the surface temperature of the exterior surface thereof attain a temperature not higher than one hundred twenty -five (125) degrees Fahrenheit when the appliance is under continuous operation. j.. All space heating equipment shall be of the vented type and properly vented to an effective flue. Space heat- ers shall have one hundred (100) per cent shut -off. k. Radiant heaters or other unvented heaters of less than 25,000 BTU input may be installed in fireplaces provid- ing the chimney has a positive draft with the damper closed. and add the following in lieu thereof: 11. Flue Pipes (Breeching) a. For equipment or appliances specifically designed to burn only gas, the internal cross - sectional area of the flue pipe between the equipment or appliance and the chim- ney liner shall be such as to provide not less than one (1) square inch of internal cross - sectional area per 7500 hour- ly BTU input in accordance with Table I herein. In no case shall this flue pipe be less than five (5) inches in diam- eter or equivalent cross - sectional area for central heating equipment or four (4) inches in diameter or equivalent cross - sectional area for space heating equipment and further, in no case shall this flue pipe have an internal cross - sectional area less than the internal cross - sectional area of the flue collar opening as provided on the equip- ment or appliance by the manufacturer, regardless of input rating. b. For installation of gas conversion burners in equip ment or appliances originally designed for burning various fbels including but not specifically gas, the internal cross - sectional area of the flue pipe between the equipment or appliance and the chimney liner shall be such as to provide not less than one (1) square inch of flue area per 7500 hourly BTU input. In no case shall this flue pipe be less than five (5) inches in diameter or equivalent cross - sectional area for central heating equipment or less than four (4) inches in diameter or equivalent cross - sectional area for space heating equipment and it shall not be larger than the next integral inch diameter above the size given in the following Table No. 1. -3- TABLE NO. 1 Minimum Permissible Flue Sizes For Gas Burner Installations Input Rating Area of Diameter of P 9 Flue Outlet Flue Pipe (BTU per Hour) (Sq. Inches) (Inches) 94,500 12.6 4 147,000 19.6 5 212,250 28.3 6 288,750 38.5 7 377,250 50.3 8 477,000 63.6 9 Notes: (1) This table is based on one (1) sq. in. of flue area per 7500 BTU per hour input. (2) If flue pipe exceeds ten (10) feet in length or contains more than two elbows, use next size pipe and draft hood. (3) In special cases with high chimneys or flues, the above schedule or areas may be modified sub- ject to specific approval by the Bureau. (4) In cases where the outlet from the equipment to be converted is larger than the above indicated size, an orifice plate may be inserted, or a section of the flue pipe restricted to the size indicated. The plate or restriction must be installed between the equipment and the draft hood. (5) The draft hood should ordinarily be located ad- jacent to the equipment. In cases where it ap- pears desirable to place the draft hood at a distance from the equipment, the size of the restricted section may be modified according to the length and rise of the flue pipe. (6) The proportioned section of the flue outlet of the equipment eliminates the necessity of using an adjustable damper in the flue pipe and such damper will not be permitted. (7) Where dampers are an integral part of the equip- ment to be converted, they shall be removed or permanently secured in the wide open position, except such dampers, the function of which is to alter the passage of flue gases through appli- ances, which shall be locked in such a position as not to interfere with the normal operation of the burners.. MC c. Material used for flue pipe shall be such as to re- sist the corrosive action of flue gases. d. Flue pipe of existing systems shall be relocated where necessary and new flue pipe installations shall be made as to avoid sharp turns or other constructional features which would create excessive resistance to the flow of flue gases. e. Changes in cross - sectional areas in flue pipe and Venting systems shall be accomplished by properly design- ed and tapered transformations or other similar appropriate fittings and shall be subject to approval by the Bureau. f. Flue pipe shall slope upward to the chimney at a grade of not less than one quarter (14) inch per foot of length unless otherwise approved by the Bureau. g. Flue pipe shall be tightly connected to the chimney liner so as to prevent infiltration of cold air. h. No baffles shall be applied which will interfere with the proper combustion of the gas and /or proper vent- ing of the equipment. i. Flue pipe shall be well supported to prevent sagging and shall not be installed closer than six (6) inches to any combustible building materials unless flue pipe is cov- ered with noncombustible insulation such that the surface temperature of the exterior surface thereof will not exceed one hundred twenty -five (125) degrees Fahrenheit when the appliance is under full, continuous operation. j. All space heating equipment shall be of the vented type and properly vented to an effective flue. Space heaters shall have one hundred (100) per cent shut -off. k. Radiant heaters or other unvented heaters not exceed- - ing 25,000 BTU per hour input may be installed in fireplaces providing the chimney has a positive draft with the damper closed. Section 3 - that Section 16.05 Technical Regulations For Gas Burner Installations, Exceeding 400,000 BTU Per Hour Input is hereby amended by adding the following to subsection 15 Air Intakes. The area of fresh air intakes for combustion air and equipment room ventilation shall be in accordance with Section 16.07 Provisions For Combustion Air And Equipment Room Ventilation For Gas Fired Equipment. -5- �l 1 Section 4 - that Chapter 16 Gas Space Heating Requirements is hereby amended by adding Section 16.07 Provisions For Com- bustion Air find Equipment Room Ventilators For Gas Fired Equip- ment, which reads as follows: 16.07 Provisions For Combustion Air And Equipment Room Ventilators For Gas Fired Equipment 1. For heating equipment installed with a draft hood, the air requirement for primary and secondary air,excess air, and dilution air is 30 cubic feet for each cubic foot of gas input. The following table for certain selected inputs is based on a reasonable velocity (300 FPM) and a reasonable pressure drop across the grilled intake (0.030.05" H20) Overall Input Air Reqd. Size of Intake (50% Free Area) 75,000 BTUH 37.5 CFM 0.25 sq. ft.or 36 sq. in. 100,000 50 0,333 48 150,000 75 0.50 72 ' 200,000 100 0.667 96 250,000 125 0.833 120 300,000 150 1.00 144 400,000 200 1.333 192 500,000 250 1.667 240 600,000 300 2.00 288 700,000 350 2.33 336 800,000 400 2.667 384 900,000 450 3.00 432 1,000,000 500 3.33 480 2. For heating equipment.installed with a barometric damp- er, the excess air and dilution air requirements are reduced and total air requirement becomes 17.5 cubic feet for each cubic foot of gas input. The following table is based on the same velocity and pressure drop as in Section 1. Input Air Read. 400,000 BTUH 120 CFM 450,000 135 500,000 145 600,000 175 700,000 205 800,000 235 900,000 265 1,000,000 295 1,250,000 365 1,500,000 435 1,750,000 505 2,000,000 575 Overall Size of Intake (50% Free Area 0.8 sq. ft. 115 sq. in. 0.9 130 0.97 140 1.17 168 1.37 197 1.57 226 1.77 255 1.97 284 2.43 350 2.90 417 3.37 485 3.83 552 I� Y 3. For heating equipment other similar types of draft requirement is 15 cubic feet gas input The foll t installed with uptake dampers or control equipment, the total air of air for each cubic foot of bI owing a e is based on the same velocity and pressure drop as in Sections 1 and 2. Overall Input Air Read. Size of Intake (50% Free Area) 750,000 BTUH 187.5 CFM 1.25 sq. ft. 180 sq. in. 800,000 200.0 1.33 192 900,000 225.0 1.50 216 1,000,000 250.0 1.67 240 1,500,000 375.0 2.50 360 29000,000 500.0 3.33 480 2,500,000 625.0 4.17 600 3,000,000 750.0 5.00 720 It should be noted that the sizes indicated are for gravity intakes communicating directly to the outdoors and, while al- lowance has been made for ordinary equipment such as bird screens, etc.., no allowance has been made for-duct losses. Siz- es shall be increased accordingly for any appreciable amount of duct work and /or other restrictions placed in the intake. For systems equipped with an intake fan, the air requirements indicated shall be used in determining fan capacities. For intetior, or alcove install ttons pf eguipmen�; -of the normal esid.ential size 'r..,_ s wi:th� .vin'_. ;3;lati:otz� ;�3.r�.ftom An tide' bui�.ding;� 'then..xe irement > s the qu $ Of -Nat ona_i Boud A- ",t: ;te Under- ' �5`�errlters cim hl:et 54 da a `A" .r` 9, .:sYi�1�. a ` 1 . ,- d':_ ugu t' M 1.. PP Y3 two .�' openi�nga;-_ one at to 6f ,exiclosure arid_ aiie at bottom; dae ` ,%* th- _a Ttee ;area of --(1 s ar. s. gi r: �:. qu e . inch., Per ,1000 BTUH ingUt; .thesa� openings shall com* date; .with lhte ior, . areas having adequate inflltxat gn4;fro ;.the Ou.t � ^Other ventilation: rmeth,od "sacceptal�ie under :ecuiremnts. of t�F(J� „54 shall he con- M .s der'ecl - acceptable- by- tli` Bureau where'' the above conditions do not apply. For Incinerators 1.5 CFM for each pound per hour capacity shall be provided. - Section 5 - that Section 18.17 Appliance Installation is hereby amended by adding the following to item e: The minimum area for fresh air intakes for combustion air and equipment room ventilation shall be in accordance with Section 16.07 Provisions For Combustion Air And Equipment Room Ventilation For Gas Fired Equipment. Section 6 - that Section 19.03 Permit Regulations is hereby amended by deleting item a of subsection 1 Work For Which Permits Are Required, which reads as follows: a. It shall hereafter be unlawful for any person, firm or corporation to construct or install any heating plant or equipment, such as is subject to regulation by the provisions of this code, in or for any building or to alter or repair 50 _DLOO any such existing heating plant or equipment, without first making written application to and securing a permit from the Bureau therefor, or to fail or neglect to comply with the provisions of this code and of the permit so issued thereunder, and any person, firm or corporation, when applying for any such permit shall, upon demand of said Bureau, furnish all necessary plans, in duplicate, for such proposed construction, installa- tion, alteration or repair and with all proper and sufficient information relating thereto and shall secure the approval of said plans before such permit shall be issued. All such plans and /or specifications, except for single family or two family dwellings or for heating installations wherein the space to be heated does not exceed 100,000 cubic feet, shall be prepared and signed by a "Registered Professional Engineer" duly qualified by registration as required by "An Act to Regulate the Practice of Architecture, Professional Engineering and Land Surveying," Chapter 523, Laws of 1921, as amended by Chapter 404, Laws of 1933, State of Minnesota, and by no other person or persons. and substitute the following in lieu thereof: a. It shall be unlawful for any person, firm or corporation to construct or install any heating plant or equipment in any building or to alter or repair any existing heating plant or equipment without first making written application to and secur- ing a permit from the Bureau therefor, or to fail or neglect to comply with the provisions of this code and of any permit is- sued thereunder. Plans shall be required in duplicate as provid- ed in Section 1.08 Permits (Application, Issuance and Regula- tions). Plans shall include in addition to the details of the system to be installed, the heat loss for each room or area in- cluded in the space to be heated. Section 7 - that Section 19.05 Regulations is hereby amended by deleting paragraph c of subsection 9, which reads as follows: c. On single boiler installations of low pressure steam systems, the return connections shall preferably be made through a water line loop connection without check valves (Hartford connections). Whenever a gate valve is provided on the steam outlet from any boiler, a gate valve shall be placed in the corresponding return to the boiler. and insert the following in lieu thereof: c. On low pressure steam systems involving single or multi- ple boilers with gravity condensate return (including boiler re- turn trap installations) the return connections shall be made through a Hartford connection and safety loop on each boiler. The safety loop shall be of proper size as approved by the Bur- eau but not less than 2 -inch NPS, shall connect the steam out- let or header to the return, and shall not be separated from the boiler by any type of valve. Section 8 - that Section 19.05, Regulations, is hereby amended by deleting paragraph e of Subsection 9, which reads as follows: e. Each low pressure steam boiler installation shall have an equalizing pipe of proper size, not less then two (2) inch, connecting the steam outlet or header, to the return. and insert the following in lieu thereof: e.. Whenever a valve is provided on the steam outlet or header of any boiler, a gate valve shall be placed in the corresponding return to the boiler. Whenever a low pressure steam system incorporates a boiler feed, pumped return, or combination feed - return device, at least one check valve and one gate valve shall be installed, respectively, between the device and the boiler with the gate valve being located as close to the boiler as possible,. Section 9 - that Sectionr20.03 Warm Air Heating, Ventila- tion And Sheet Metal Work Permit Regulations is hereby amended by deleting item b of Subsection 2 Permit Application, Issu- ance and Fees, which reads as follows: b. No plan shall be approved or permit issued where the building to be heated or ventilated exceeds 100,000 cubic feet unless the plan so submitted shall be prepared and signed by a registered professional engineer,duly qualified by registration as required by an act to regulate the prac- tice of architecture, professional engineering and land surveying, Chapter 523, Laws of Minnesota for 1921, as amend- ed by Chapter 404, Laws of Minnesota for 1933, and Chapter 380, Laws of Minnesota for 1945. Provided, however, that the Bureau may waive the above requirement of a permit in the case of alterations or repairs to any existing warm air heat- ing or ventilation systems where the cost of such altera- tions or repairs will not add to the required capacity of such heating or ventilating systems, and are not, in the opin- ion of said Inspector, of such a nature as to render an in- spection of the same necessary or desirable. and insert the following in lieu thereof: b. Plans shall be submitted in duplicate as provided in Section 1.08 Permits (Application, Issuance and Regulations). Section 10 - that Section 20.03 Warm Air Heating, Venti- lation And Sheet Metal Work, Permit Regulations is hereby furth- er amended by adding item c to subsection 3 Publications as folio*. c. The National Fire Protection Association Pamphlet 90A (1963 Edition) Standards For The Installation of Air Condi- tioning and Ventilation Systems of Other Than Residence Type and Pamphlet 90B (1961 Edition) Standards For The Installa- • I CITY OF SAINT PAUL] ICanifal of Minnpcnfa i Gs BUREAU OF PUBLIC BUILDINGS ALFRED H. SCHROEDER, City Architect 445 City Hall, Zone 2 CApital 4 -4612 Ext. 361 January 16, 1964 RECEIVED Hon. Donald L. Lais JAN 17 1964 Corporation Counselor =; CORPORATION_ C_QUNSEL Dear Sir: I am referring to you for your study and approval as to form the enclosed copies of an ordinance which will amend the Saint Paul Legislative Code, Chapters 16, 18, 19 and 20 referring generally to gas fired installations, boiler installations, and permit regulations. If this amendment meets with your approval as to form, I would like to introduce it at an early council meeting. Yours truly, ank L. Loss Commissioner a 1 +a•r " 216" TABLE NO. 1 MINIMUM PERMISSIBLE FLUE SIZES FOR / lc GAS BURNER INSTALLATIONS Area Of Diameter of Input Rating Flue Outlet Flue Pipe (BTU per Hour) (Sq. In.) (Inches) 94,500 12.6 4 147,000 19.6 5 212_,250 28.3 6 288,750 38.5 7 377,250 50.3 8 4770-000 63.6 9. NOTES: (1) This table is based on one (1) sq, in. of flue area per 7,500`BTU per hour input. (2) If flue pipe exceeds ten (10) feet in length or contains more than two elbows, use next size pipe and draft hood. (3) In cases where the outlet from the appliance is larger than the above indicated size, an orifice plate may be insertgd, or a section of the flue pipe restricted to the size indicated. (4) In special cases with high chimneys or flues, the above schedule or areas may be modified_ subject � to specific approval by the Bureay. b. The draft hood should ordinarily be located adjacent to,the appliance. In cases where it appears desirable to place the draft hood at a distance from the appliance, the size of the restricted section may be modified according to the length and rise of the flue pipe: c. The proportioned section of the flue outlet of the appliance eliminates the necessity of using an adjustable damper in the flue pipe and such damper will not be permit- ted. d, Where dampers are an integral part of the boiler or tprnace, they shall be removed or permanently secured in t-he wide open position, except" such dampers, the function of which is to alter-the passage of flue gases through the appliances, which shall be locked in such a position as not to interfere with the normal operation of the burners. e. Material used for flue pipe shall be such as to re- sist-the corrosive action of flue gases. . f. Flue pipe of existing systems shall be relocated where necessary and new flue pipe installations shall be made as to avoid sharp turns or other constructional features" which would create excessive resistance to the flow of the t -2- .. 211666 flue gases. Flue pipes shall slope upward to chimney. % g.. Flue pipe shall be tightly connected to the chimney .,liner, so as to prevent infiltration of cold air, h. No baffles shall be applied which will interfere with the proper combustion of the gas. i. Flue pipe shall be well supported to prevent sag - ging'and shall not be installed closer than six (6) inches to any combustible building materials unless flue pipe is covered with incombustible insulation such that the surface temperature of the exterior surface thereof attain a temperature-not higher than _one hundred twenty -five (125) degrees Fahrenheit when the appliance is under continuous operation, -- j.. All space heating equipment shall.be of the vented type and properly vented to an effective flue. Space heat- ers shall have one hundred (100) per cent shut -off. k. Radiant heaters or other, unvented heaters of less than 25,000 BTU input may be installed in fireplaces provid- ing the chimney has a positive draft with the damper closed.-- and add the following in lieu thereof: 11. Flue Pipes (Breeching) ~� a: For equipment or appliances specifically designed to burn only gas, the internal cross - sectional area of the flue pipe between the equipment or appliance and the chim- ney liner shall be such as to provide nbt less than one (1) square inch of internal cross - sectional area per 7500 hour- ly BTU input in accordance with Table I herein. In -no case shall this'flue pipe be less than five (5) inches in diam- eter or equivalent cross - sectional area for central heating equipment or four (4) inches in diameter or equivalent cross - sectional area for space heating equipment and further, in no case shall this flue pipe have an internal cross- sectional area less than the internal cross - sectional area of the flue collar opening as provided on the equip- ment or appliance by_the manufacturer, regardless of input rating., b. For installation of gas conversion burners in equip- ment or appliances originally designed for burning various fuels including but not specifically gas, the internal cross - sectional area of the flue pipe between the equipment or appliance and the chimney liner shall be such as to provide not less than one (l) square inch of flue area.per 7500 hourly BTU input. In no case shall this flue.pipe be less than five (6) inches in diameter or equivalent cross - sectional area for central heating equipment or less than four (4) inches in diameter or equivalent cross - sectional area for space heating equipment and it shall not be-larger than the next integral inch diameter above the size given in* the following'Table No. 1.. -3- Minimum Gas Input Rating (BTU per Hour) TABLE NO. 1 Permissible Flue Sizes.For Burner Installations Area of Flue Outlet (Sq. Inches) 42V 31:yj 1"n-6611 Diameter of Flue Pipe (Inches) 94,500 12.6 4 147,000 19.6 5 212,250 28.3 6 288,750 38.5 7 377,250 50.3 8 477;000 63.6 9 Notes: (1) This table is based on one (1) sq. in. of flue area per 7500 BTU per hour input. (2) If flue pipe exceeds ten (10) feet in length or contains more than two elbows, use next size pipe and draft hood. (3) In special cases with high chimneys or flues, the above schedule or areas may be modified sub- ject to specific approval by the Bureau. (4) In cases where the outlet from the equipment to be converted is larger than the above indicated size, an orifice plate may be inserted, or a section of the flue pipe restricted to the size indicated. The plate or restriction must be installed between the equipment and'the draft hood. (5) The draft hood should ordinarily be located ad- jacent to the equipment. In cases where it ap- pears desirable to place the draft hood at a distance from the equipment, the size of the restricted section may be modified according to the length and rise of the flue pipe. (6) The proportioned section of the flue outlet of the equipment eliminates the necessity of using an adjustable damper in the flue pipe and such damper will not be permitted. (7) Where dampers are an integral part of the equip- ment to be converted, tfiey shall be removed or permanently secured in the wide open position, except such dampers, the function of which is to alter the passage of flue gases through appli- ances, which shall be locked in such a position as not to interfere with the normal operation of the burners.. ME . J 'a `l c. Material used for flue pipe shall be such as to re- sist the corrosive action of flue gases. d. Flue pipe of existing systems shall be relocated .� where necessary and new flue pipe installations shall be made as to avoid sharp turns or other constructional features which would create excessive resistance to the flow of flue gases. e. Changes in cross - sectional areas in flue pipe and .venting systems shall be accomplished by properly design- ed and tapered transformations or other similar appropriate fittings and shall be subject to approval by the Bureau. f. Flug pipe shall slope upward to the chimney at a grade of not less than one quarter (%) inch per foot of length unless otherwise approved by the Bureau. g. Flue pipe shall be tightly connected to the chimney liner so as to prevent infiltration ofJcold air. h. No baffles shall be applied which will interfere with the proper combustion of'the gas and /or proper vent- ing of the equipment. i. Flue pipe shall be well supported to prevent sagging and shall not be installed closer than six (6) inches to any combustible building materials unless flue pipe is cov- ered with noncombustible insulation such that the surface temperature of the exterior surface thereof will not exceed one hundred twenty -five (125) degrees Fahrenheit when the appliance is under full, continuous operation. j. All space heating equipment shall be of the vented type and properly vented to an effective flue. Space heaters shall have one hundred (100) per cent shut -off. k. Radiant heaters or other unvented heaters not exceed- ing 25,000 BTU per hour input may be installed in fireplaces providing therchimney has a positive draft with the damper closed. " Section 3 - that Section 16.05 Technical Regulations For Gas Burner Installations, Exceeding 400,000 BTU Per Hour'Input is hereby amended by adding the following to subsection 15 - Air Intakes. - - The area of fresh air intakes for combustion air and equipment room ventilation shall be in accordance with Section 16.07 Provisions For Combustion Air And Equipment Room Ventilation For Gas Fired Equipment. -5- Section 4 - that Chapter 16 Gas Space Heating Requirements is hereby amended by adding Section 16,07 Provisions For Com- bustion Air find Equipment Room Ventilators For Gas;Fired Equip- ment, which reads as follows: 16,07 Provisions For,Combustion Air And Equipment Room Ventilators For Gas Fired Equipment 1.- For heating equipment °installed with a draft hood, the air requirement for primary and secondary air,excess air, and dilution air is 30 cubic feet for each cubic foot of gas input. The following table for certain selected inputs-is based on a reasonable velocity (300 FPMI) and a reasonable pressure drop across the grilled intake (0.03 - 0.05" H20) Overall Input Air Reqd. Size of Intake (50% Free Area) 751000 BTUH 37.5 CFM 0..25• sq. ft. or 36 -sq. In. 100;000 ( 50 0,333 48 150, 000 75 0, 50- 72. 200,000 100 0,667. 96, 250,000 125. 0.,833 - 120 300,000 150 1.00- 144, . 400, 000 200 1.333, 192. - -• 500,000 250 1.667 240: 600,000 _ 300. 2.00.' 288 ~ 700,000 350. 2.33 336 `800,000 400 2.667 384 r 9100,000 450. 3.00- 432. • `I , 000, -000 500 3.33 480 2. For heating equipment installed with a barometric damp- er, the excess air and dilution air requirements -are reduced and total air requirement becomes 17.5 cubic feet for each cubic foot of gas input, The following table is based on the same velocity and pressure drop as in Section j .- Input , Air Reqd. 400,000 BTUH 120 CFM 450,000 135 500,000 145 600,000 175 700,000 205 800,000 235 900,000 265 1,000,000 295 1,250,000 365 1,500,000 435 1,750,000 505 2,000,000 575 -6- Overall Size of Intake (509 Free Area) 0.8 sq. ft. 115 sq. in. 0.9 130 0.97- 140 1.17 168 1..37- 197 1.57 226 1.77 255 1.97 284- 2.43 350 2.90 417. 3..37. 485, 3..83 552 a r' 3. For heating equipment installed with uptake dampers or other similar types of draft control equipment, the total air requirement is 15 cubic feet of air for each cubic foot of gas input. The following table is based on the same velocity and pressure drop as in Sections 1, and 2.. Overall Input Air Regd. Size of Intake (50% Free Area) 7501000 BTUH 187.5 CFM 1.25 sq. ft. 180 sq. in. 800,000 200.0 1.33 192 900,000 225.0 1.50 216 1,000,000 250.0 1.67 240 1,500,000 375.0 2.50 360 2,000,000 500.0 •3.33 480 2,500,000 625.0 4.17, 600 3,000,000 750..0 5.00 720 `f It should be noted that the sizes indicated are for gravity intakes communicating directly to the outdoors and, while al- lowance has been made for ordinary equipment such as bird screens, etc.., no allowance has been made for duct losses. Siz- es shall be increased accordingly for any appreciable amount of ductwork and /or other restrictions placed in the intake. For systems equipped with an intake fan, the air requirements indicated shall be used in determin' g fan caps it-ies. For interio "r or alcove installations of e ui Ze t of ith6v- nora a�]�.;�aental�;- siz'es:, with yentilatiori _aim j �t ,,,,�,w- ,_ from °inside.,, h�e buiw��c�zng t ie `_�eFquireh!V of :National hoar .x _ a" Qfire .Under= writens`-'Pam tvuo p ,, g ,,w ones ate .top<.fehc]�o. sure and- one : pat'i bo„ tto; each i��: "I'�wth; ':'free =` areaof�. oner(:�squ`ae- ,inch= M1pes�`•1000�'�BTtJH "nputy� N. _ eri3 n x 411 —rd areas= haying :ad''equate nfilftratiorZ fronf.7-th6`6:6t sid ver}titlation Yme`thods - acceptable'.tinde,r requirements of- �NBM'54' sha�,l be- ,con - °^ ;�� r "- sdeyed' �.acceptab4le`by.:tYiisrBure,au "-where the above ,c'rYd`ij_ ons do not a' `"''•N • n ` = 4' - For.incinerato ,rs 1.5.CFM for each pound per hour capacity shall be provided., Section 5 - that Section 18.17 Appliance Installation is hereby amended by adding the following to item e, The minimum area.for fresh air intakes for combustion air and equipment room ventilation shall be in accordance with Section 16.07 Provisions for Combustion Air And Equipment Room Ventilation For Gas Fired Equipment; Section 6 - that Section 19,03 Permit Regulations is hereby amended by'deleting item a of subsection 1 Work For 'Which Permits Are Required, which reads as follows,: a. It shall hereafter be unlawful for any person, firm or corporation to construct or install any heating plant or equipment, such as is subject to regulation by the provisions of this code, in or for any building or to alter or repair -7- any such existing heating plant or equipment, without first making written application to and securing a permit from the Bureau therefor, or to fail or neglect to comply with the provisions of this code and of the permit so issued thereunder, and any person, firm or corporation, when applying for any such permit shall, upon-demand of said Bureau, furnish all necessary plans, in duplicate, for such proposed construction, installa- tion, alteration or repair and with all proper and sufficient information relating thereto and shall secure the approval of said plans before such permit shall be issued. All such plans- and/or specifications, except for single family or two family dwellings or for heating installations wherein the space to be heated does not exceed 100,000 cubic feet, shall be prepared and signed by a "Registered Professional�Engineer" duly qualified by registration as required by "An Act to _Regulate the Practice of Architecture,! Professional Engineering and Land Surveying," Chapter 523, Laws of 1921, as amended by Chapter 404, Laws of 1933,. State of Vinnesota,.and by no —other person or persons. and substitute the I following in lieu thereof: a. It shall be unlawful for any person, firm or corporation to construct or install any heating plant or equipment in any building or to alter or repair any existing heating plant or equipment without first making written application to and secur- ing a permit from the Bureau therefor, or to fail or neglect to comply with the provisions of this code and of any permit is- sued thereunder.{ Plans shall be required in duplicate as provid- ed in Section 1.08 Permits (Application, Issuance and Regula- tions). Plans shall include in addition to the details of the system to be installed, the heat loss for each room or area in- cluded in the space to be heated. Section 7 - that Section 19.05 Regulations is hereby amended by deleting paragraph c of subsection 9, which reads as follows: c. On singlelboiler installations of low pressure steam systems, the return connections shall preferably be made through a water line loop connection without check valves (Hartford connections). Whenever a gate valve is provided on the steam outlet from any boiler, a gate valve shall be placed in the corresponding return to the boiler. and insert the following in lieu thereof: c. On low pressure steam systems involving single or multi- ple boilers with1gravit condensate return (including boiler re- turn trap installations the return connections shall be made through a Hartford connection and safety loop on each boiler.- : The safety loop shall be of proper size as approved by the Bur- : eau but not less than 2 -inch NPS, shall connect the steam out- let or header tolthe return, and shall not be separated from the boiler by any type of valve. ray Section 8' - that Section 19.05, Regulations, is hereby amended by deleting paragraph e of Subsection 9, which reads as follows: I e. Each flow pressure steam boiler installation shall have an equalizing pipe of proper size, not less then two (2) inch, connecting the steam outlet or header, to the return. and insert the following in lieu thereof: e. Whenever a valve is provided on the steam outlet or header of any boiler, a gate valve shall be placed in the corresponding,return to the boiler. Whenever a low pressure steam system incorporates a boiler feed, pumped return, or combination feed - return device, at least one check valve and one gate valve shall be installed, respectively, between the device and the boiler with the gate valve being located as close to the boiler as possible. Section 9 ,, that Section 20.03 Warm Air Heating, Ventila- tion And Sheet Metal Work Permit Regulations is'hereby amended by deleting item, b of Subsection 2 Permit Application, Issu- ance and Fees, which reads as follows: b. No plan shall be approved or permit issued where the building to be heated or ventilated exceeds 100,000 cubic feet unless the plan so submitted shall be prepared and signed by a registered professional engineer,duly qualified by registration as required by an act to regulate the prac- tice of architecture, professional engineering and land t surveying, Chapter 523, Laws of Minnesota for 1921, as amend- ed by Chapter 404, Laws of Minnesota for 1933, and Chapter 380, Laws of Minnesota for 1945. Provided, however, that the Bureau may waive the above requirement of a permit in the case of alterations or repairs to any existing warm air heat- ing or ventilation systems where the cost of such altera- tions or repairs will not add to the required capacity of such heating or ventilating systems, and are not, in the opin- ion of said Inspector, of such a nature as to render an in- spection of the same necessary or desirable. and insert the following in lieu thereof: b. Plans shall be submitted in duplicate as provided in Section 1.08 Permits (Application, Issuance and Regulations). Section 10 - that Section 20.03 Warm Air Heating, Venti- lation And Sheet Metal Work, Permit Regulations is hereby furth- er amended by adding item c to subsection 3 Publications as folio*. c. The National Fire Protection Association Pamphlet 90A (1963 Edition) Standards For The Installation of Air Condi- tioning and Ventilation Systems of Other Than Residence Type and Pamphlet 90B (1961 Edition) Standards For The Installa- 1st 2n Laid over to 3rd and ap A dopte Yeas Nays Yeas Nays Dalglish Dalglish Holland Holland Loss Loss -7 Mortinson n Mortinson Peterson (' / Peterson -Remy- v Rosen Mr. President V Mr. President Vavonlis s J PUBLIC =`�D ��