CHAPTER 4 GAS PIPING INSTALLATIONS - iccsafe.org

1 CHAPTER 4 GAS PIPING INSTALLATIONSSECTION FGC CHAPTER shall govern the design, installation,modification and maintenance of fuel-gas PIPING systems. Thescope covered by this CHAPTER includes PIPING systems from thepoint of delivery to the connections with the equipment andincludes the design, materials, components, fabrication,assembly, installation, testing, inspection, operation and main-tenance of such PIPING Meters and service pipingincludes the fuel-gas PIPING up to the point of and service PIPING shall comply with the require-ments of Appendix E and Appendix F of this code .

2 In addi-tion, service PIPING located within buildings shall bedesigned and installed in accordance with the structuralintegrity, firestopping, and fire protection provisions of theNew York City Building Plastic plastic pipinginstalled outside of buildings shall be in compliance withAppendix E and Appendix F of this Modifications to existing modifying oradding to existing PIPING systems, sizes shall be maintained inaccordance with this Additional an additional applianceis to be served, the existing PIPING shall be checked to deter-mine if it has adequate capacity for all appliances served.

3 Ifinadequate, the existing system shall be enlarged as required orseparate PIPING of adequate capacity shall be other than black steel pipe, exposedpiping shall be identified by a yellow label marked Gas inblack letters. The marking shall be spaced at intervals notexceeding 5 feet (1524 mm). The marking shall not be requiredon pipe located in the same room as the equipment two or more meters areinstalled on the same premises but supply separate consumers,the PIPING systems shall not be interconnected on the outlet sideof the PIPING meter from multiplemeter INSTALLATIONS shall be marked with an approved perma-nent identification by the installer so that the PIPING systemsupplied by each meter is readily Minimum pipe utilized for the installation.

4 Extension and alteration of any PIPING system shall be sized tosupply the full number of outlets for the intended purpose andshall be sized in accordance with Section FGC 402 PIPE General systems shall be ofsuch size and so installed as to provide a supply of gas suffi-cient to meet the maximum demand without undue loss of pres-sure between the point of delivery and the gas Maximum gas volume of gas to be pro-vided, in cubic feet per hour, shall be determined directly fromthe manufacturer s input ratings of the gas utilization equip-ment served.

5 Where an input rating is not indicated, the gassupplier, equipment manufacturer or a qualified agency shallbe contacted, or the rating from Table shall be used forestimating the volume of gas to be supplied. The total con-nected hourly load shall be used as the basis for pipe sizing,assuming that all equipment could be operating at full capacitysimultaneously. Where a diversity of load can be established,pipe sizing shall be permitted to be based on such PIPING shall be sized in accordance with oneof the following:1. Pipe sizing tables or sizing equations in accordance withSection The sizing tables included in a listed PIPING system smanufacturer s installation Other approved engineering Individual outlets to gas ranges shall not be less than (19 mm) Sizing tables and Tables (1)through (6)

6 Are used to size PIPING or tubing, the pipelength shall be determined in accordance with Section , or Equations 4-1 and 4-2 are used to size PIPING or tub-ing, the pipe or tubing shall have smooth inside walls and thepipe length shall be determined in accordance with , or Low-pressure gas equation [Less than pounds persquare inch (psi) ( kPa)]:DQHCLr= 0 3810 (Equation 4-1)2008 NEW YORK CITY FUEL GAS CODE25 :\data\CODES\STATE CODES\New York City\2008\Fuel Gas\Final VP\ , June 02, 2008 1:38:55 PMColor profile: Generic CMYK printer profileComposite Default screen2.

7 High-pressure gas equation [ psi ( kPa) andabove]:()DQPP YCLr=- 0 38112220 20618 (Equation 4-2)where:D= Inside diameter of pipe, inches (mm).Q=Input rate appliance(s), cubic feet per hour at 60 F(16 C) and 30-inch mercury columnP1= Upstream pressure, psia (P1+ )P2= Downstream pressure, psia (P2+ )L= Equivalent length of pipe, feetDH= Pressure drop, inch water column ( inch water col-umn = 1 psi)TABLE FOR NATURAL GASAT STANDARD CONDITIONS GASEQUATION FACTORSCrYNatural SI: 1 cubic foot = m3, 1 foot = 305 mm, 1-inch water column = kPa, 1 pound per square inch = kPa, 1 British thermalunit per hour = Longest length pipe size of each sec-tion of gas PIPING shall be determined using the longestlength of PIPING from the point of delivery to the mostremote outlet and the load of the Branch length shall be sized as fol-lows:1.

8 Pipe size of each section of the longest pipe run fromthe point of delivery to the most remote outlet shall bedetermined using the longest run of PIPING and theload of the The pipe size of each section of branch PIPING not pre-viously sized shall be determined using the length ofpiping from the point of delivery to the most remoteoutlet in each branch and the load of the Hybrid pipe size for each section ofhigher pressure gas PIPING shall be determined using thelongest length of PIPING from the point of delivery to themost remote line pressure regulator.

9 The pipe size from theline pressure regulator to each outlet shall be determinedusing the length of PIPING from the regulator to the mostremote outlet served by the Allowable pressure design pressure loss inany PIPING system under maximum probable flow conditions,from the point of delivery to the inlet connection of the equip-ment, shall be such that the supply pressure at the equipment isgreater than the minimum pressure required for proper equip-ment Gas distribution gas distribution pipingcontaining gas at a pressure in excess of1/2psig ( kPa gauge)shall be run within a building, except that pressure not exceed-ing 3 psig (20 kPa gauge) is permitted for the following uses.

10 (a) commercial (b) industrial (c) other large volume use inwhich fuel requirements for boiler room equipment exceed4,000 cubic feet per hour ( m3/h) and such large volumeuse is supplied through separate gas distribution PIPING to theboiler room. Gas pressure not exceeding 15 psig (100 kPagauge) is permitted for boiler room equipment in excess of100,000 cubic feet per hour (2830 m3/h) provided the gas distri-bution PIPING is installed as provided for in Section 404. Theuse of pressure in excess of 15 psig (100 kPa gauge) shall bepermitted for distribution PIPING provided all of the require-ments of Section 406 are NEW YORK CITY FUEL GAS CODEGAS PIPING INSTALLATIONSTABLE GAS INPUT FOR TYPICAL APPLIANCESAPPLIANCEINPUT BTU/H(Approx.)