N.Y.C. Admin. Code § FGC 408: Section FGC 408: Drips and Sloped Piping

408.1 Slopes.

Piping for other than dry gas conditions shall be sloped not less than 1/4 inch in 15 feet (6.3 mm in 4572 mm) to prevent traps. The local gas supplier/utility company should be consulted to determine the type of fuel gas available for the intended service.

408.2 Drips.

Drips are not permitted.

408.3 Test fittings.

A manufactured test fitting shall be installed where required by the gas supplier. Such fitting shall be downstream of a lockable supply or riser valve in accordance with the requirements of the gas supplier and the manufacturer's instructions. The outlet of the test fitting shall be the smallest commercially available. The installation of manufactured test fittings in other locations shall be prohibited.

408.4 Sediment trap.

Where a sediment trap is not incorporated as part of the appliance, a sediment trap shall be installed downstream of the appliance shutoff valve as close to the inlet of the appliance as practical. The sediment trap shall be either a tee fitting having a capped nipple of any length installed vertically in the bottom most opening of the tee as illustrated in Figure 408.4 or other device approved as an effective sediment trap. Illuminating appliances, ranges, clothes dryers, decorative vented appliances for installation in vented fireplaces, gas fireplaces and outdoor grills need not be so equipped.

Figure 408.4 Method of Installing a Tee Fitting Sediment Trap