1310.2 Installation of Piping.

Piping installed aboveground shall be securely supported and located where it will be protected from physical damage. Where passing through an exterior wall, the piping shall also be protected from corrosion by coating or wrapping with an inert material approved for such applications. The piping shall be sealed around its circumference at the point of the exterior penetration to prevent the entry of water, insects, and rodents. Where piping is encased in a protective pipe sleeve, the annular spaces between the gas piping and the sleeve and between the sleeve and the wall opening shall be sealed. [NFPA 54:7.2.1]

2019 CALIFORNIA MECHANICAL CODE 259

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FUEL GAS PIPING any other purpose or distributed to any other persons or parti es.

1310.2.1 Building Structure. The installation of gas piping shall not cause structural stresses within building components to exceed allowable design limits. Approval shall be obtained before any beams or joists are cut or notched. [NFPA 54:7.2.2 – 7.2.2.2] 1310.2.2 Gas Piping to be Sloped. Piping for other than dry gas conditions shall be sloped not less than ¹ ⁄4 inch in 15 feet (1.4 mm/m) to prevent traps. [NFPA 54:7.2.3]

on of gas piping shall not cause structural stresses within building components to exceed allowable design limits. Approval shall be obtained before any beams or joists are cut or notched. [NFPA 54:7.2.2 – 7.2.2.2] 1310.2.2 Gas Piping to be Sloped. Piping for other than dry gas conditions shall be sloped not less than ¹ ⁄4 inch in 15 feet (1.4 mm/m) to prevent traps. [NFPA 54:7.2.3]

1310.2.2.1 Ceiling Locations. Gas piping shall be permitted to be installed in accessible spaces between a fixed ceiling and a dropped ceiling, whether or not such spaces are used as a plenum. Valves shall not be located in such spaces. Exception: Appliance or equipment shutoff valves required by this code shall be permitted to be installed in accessible spaces containing vented appliances. 1310.2.3 Prohibited Locations. Gas piping inside any building shall not be installed in or through a clothes chute, chimney or gas vent, dumbwaiter, elevator shaft, or air duct, other than combustion air ducts. [NFPA 54:7.2.4] Exception: Ducts used to provide ventilation air in accordance with Section 701.0 or to above-ceiling spaces in accordance with Section 1310.2.2.1. 1310.2.4 Hangers, Supports, and Anchors. Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers, or building structural components, approved for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and equipment and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58. [NFPA 54:7.2.5.1] 1310.2.4.1 Spacing. Spacing of supports in gas piping installations shall not be greater than shown in Table 1310.2.4.1. Spacing of supports of CSST shall be in accordance with the CSST manufacturer’s instructions. [NFPA 54:7.2.5.2] 1310.2.4.2 Expansion and Contraction. Supports, hangers, and anchors shall be installed so as not to interfere with the free expansion and contraction of the piping between anchors. All parts of the supporting system shall be designed and installed so they are not disengaged by movement of the supported piping. [NFPA 54:7.2.5.3] 1310.2.4.3 Piping on Roof Tops. Gas piping installed on the roof surfaces shall be elevated above the roof surface and shall be supported in accordance with Table 1310.2.4.1. [NFPA 54:7.2.5.4] 1310.2.5 Removal of Piping. Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting or welding is done.

Roof Tops.** Gas piping installed on the roof surfaces shall be elevated above the roof surface and shall be supported in accordance with Table 1310.2.4.1. [NFPA 54:7.2.5.4] 1310.2.5 Removal of Piping. Where piping containing gas is to be removed, the line shall be first disconnected from sources of gas and then thoroughly purged with air, water, or inert gas before cutting or welding is done.

(4) Where necessary to insert fittings in gas pipe that

has been installed in a concealed location, the pipe shall be reconnected by welding, flanges, or the use of a right/left nipple/coupling. 1310.3.2 Piping in Partitions. Concealed gas piping shall not be located in solid partitions. [NFPA 54:7.3.3] 1310.3.3 Tubing in Partitions. This provision shall not apply to tubing that pierces walls, floors, or partitions. Tubing installed vertically and horizontally inside hollow walls or partitions without protection along its entire concealed length shall meet the following requirements: (1) A steel striker barrier not less than 0.0508 of an inch

(1.3 mm) thick, or equivalent, is installed between

(1) A steel striker barrier not less than 0.0508 of an inch

(1.3 mm) thick, or equivalent, is installed between the tubing and the finished wall and extends at least 4 inches (102 mm) beyond concealed penetrations of plates, firestops, wall studs, and so on. (2) The tubing is installed in single runs and is not

rigidly secured. [NFPA 54:7.3.4]

FUEL GAS PIPING any other purpose

TABLE 1310.2.4.1 SUPPORT OF PIPING

[NFPA 54: TABLE 7.2.5.2]

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