This chapter shall govern the design, installation, modification and maintenance of fuel-gas piping systems. The scope covered by this chapter includes piping systems from the point of delivery to the connections with the appliances and includes the design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance of such piping systems.
Service piping includes the fuel-gas piping up to the point of delivery. Meters and service piping shall comply with the requirements of Appendix E. In addition, service piping located within buildings shall be designed and installed in accordance with the structural integrity, firestopping, and fire protection provisions of the New York City Building Code.
Approved gas meters shall be permitted to be installed for gas consumption monitoring, energy measurement, verification and analysis. Gas meters shall be listed in accordance with ANSI B109.1, ANSI B109.2, or ANSI B109.3 and installed in accordance with the manufacturer's instructions. A full size valve bypass shall be provided around gas meters for maintenance and repair.
In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.
Where an additional appliance is to be served, the existing piping shall be checked to determine if it has adequate capacity for all appliances served. If inadequate, the existing system shall be enlarged as required or separate piping of adequate capacity shall be provided.
All piping installed in new construction and all new piping installed in existing buildings, whether or not the piping is intended to be enclosed when construction is completed, shall be identified by a yellow label marked "Gas" in black letters. Where the installation requires a gas test, such labeling shall be completed prior to such test. Labels shall be provided in accordance with ASME A13.1 and the marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on pipe located in the same room as the appliance served.
Piping from multiple meter installations shall be marked with an approved permanent identification by the installer so that the piping system supplied by each meter is readily identifiable. Such marking shall be in accordance with ASME A13.1.
Pipe utilized for the installation, extension and alteration of any piping system shall be sized to supply the full number of outlets for the intended purpose and shall be sized in accordance with Section 402.
Piping, tubing and fittings shall comply with the applicable referenced standards, specifications and performance criteria of this code and shall be identified in accordance with Section 401.9. Piping, tubing and fittings shall either be tested by an approved third-party testing agency or certified by an approved third-party certification agency.
Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.
The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the appliances served.
The total connected hourly load shall be used as the basis for pipe sizing, assuming that all appliances could be operating at full capacity simultaneously. Where a diversity of load can be established, pipe sizing shall be permitted to be based on such loads.
The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2,000 feet (610 m) in elevation.
Gas piping shall be sized in accordance with one of the following: