N.Y.C. Admin. Code § FGC_AppE.5: E.5 Gas service piping connections.

Gas service piping connections shall comply with the following:

1. Gas service piping shall be fitted with a gas service line valve, the valve located on the supply side of the meter and service regulator, if a service regulator is required. Where a plug type valve is used, it shall be constructed so as to prevent the core from being blown out by the pressure of the gas. In addition, it shall be of a type capable of being locked in the off position by the local gas utility. Where the gas service line valve is inside the building, it shall be in an accessible location within 2 feet (609.6 mm) of the point where the gas service connection enters the building or at such other location as may be permitted by the commissioner. Where the gas service connection is installed through a building wall below ground, it shall be protected with a wall sleeve extending at least 4 inches (101.6 mm) beyond the outer side of the wall and at least 1 inch (25.4 mm) beyond the inner side of the wall. The sleeve shall be sealed at both ends to prevent the entry of water and gas. Gas service connections, installed through ground slab construction, shall be protected with a floor sleeve sealed at both ends to prevent the entry of water and gas. The sleeve shall extend at least 4 inches (101.6 mm) above the floor, and shall be installed as specified by the utility company providing the service. It shall terminate at least 4 inches (101.6 mm) outside the building.

2. In all high-pressure areas, the utility company providing the service may inspect the gas service line valve and regulator in accordance with the provisions of 16 NYCRR Part 255 in addition to the department in accordance with Section 406 of this code.

3. No gas service shall enter a structure at a horizontal distance of less than 10 feet (3048 mm) from the cellar termination of a stairway, nor shall any gas meters or gas regulators be located less than 10 feet (3048 mm) from such stairway termination. Where such services, meters and regulators are separated from the stairway termination by a permanent partition or wall having a fire-resistance rating of at least 1 hour, the foregoing shall not apply. Unless forbidden by other provisions of this code, locations under a stairway are exempt from this requirement.

4. When the structure is erected on fill or on piles, provision shall be made to preclude possible damage to the gas service piping caused by settlement.

5. The installation of gas service piping shall be made in accordance with the requirements of the utility corporation providing the service as regulated by the provisions of 16 NYCRR Part 255. Further, such installation shall meet the requirements of the department.

6. Gas service piping outside a structure shall be installed not less than 24 inches (609.6 mm) below grade, except that a lesser distance of not less than 18 inches (457.2 mm) may be permitted, provided the piping is adequately protected in accordance with the requirements of this code and the utility corporation supplying service, and the piping is not located below a driveway. Any piping that is exposed to outdoor temperatures or installed underground with a cover of less than 2 feet (609.6 mm) shall be protected against frost, except that frost protection may be omitted in areas where the utility company certifies that dry gas is being distributed.