1308.7 Gas Pressure Regulators.

A line pressure regulator or gas appliance pressure regulator, as applicable, shall be installed where the gas supply pressure is higher than that at which the branch supply line or appliances are designed to operate or vary beyond design pressure limits. [NFPA 54:5.8.1] 1308.7.1 Listing. Line pressure regulators shall be listed in accordance with CSA Z21.80. [NFPA 54:5.8.2] 1308.7.2 Location. The gas pressure regulator shall be accessible for servicing. [NFPA 54:5.8.3] 1308.7.3 Regulator Protection. Pressure regulators shall be protected against physical damage. [NFPA 54:5.8.4] Line pressure regulators shall comply with all of the fol- 1308.7.4 Venting of Line Pressure Regulators. lowing: (1) An independent vent to the exterior of the building,

sized in accordance with the regulator manufac

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An independent vent to the exterior of the building,

sized in accordance with the regulator manufac

256 2019 CALIFORNIA MECHANICAL CODE

FUEL GAS PIPING

turer’s instructions, shall be provided where the location of a regulator is such that a ruptured diaphragm will cause a hazard. Where more than one regulator is at a location, each regulator shall have a separate vent to the outdoors or, if approved by the Authority Having Jurisdiction, the vent lines shall be permitted to be manifolded in accordance with accepted engineering practices to minimize backpressure in the event of diaphragm failure. Materials for vent piping shall be in accordance with Section 1308.5 through Section 1308.5.11.5. Exception: A regulator and vent limiting means combination listed as complying with CSA Z21.80 shall be permitted to be used without a vent to the outdoors. (2) The vent shall be designed to prevent the entry of

water, insects, or other foreign materials that could

(2) The vent shall be designed to prevent the entry of

water, insects, or other foreign materials that could cause blockage. (3) The regulator vent shall terminate at least 3 feet (914

mm) from a source of ignition.

(3) The regulator vent shall terminate at least 3 feet (914

mm) from a source of ignition. (4) At locations where regulators might be submerged

during floods, a special antiflood-type breather vent

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(4) At locations where regulators might be submerged

during floods, a special antiflood-type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters. (5) A regulator shall not be vented to the appliance flue

or exhaust system. [NFPA 54:5.8.5.1]

(5) A regulator shall not be vented to the appliance flue

or exhaust system. [NFPA 54:5.8.5.1] ulators.1308.7.5 Venting of Gas Appliance Pressure Reg- For venting of gas appliance pressure regulators, see Section 902.15. [NFPA 54:5.8.5.2] 1308.7.6 Discharge of Vents. The discharge of vents shall be in accordance with the following: (1) The discharge stacks, vents, or outlet parts of all

pressure -r elieving and pressure-limiting devices

(1) The discharge stacks, vents, or outlet parts of all

pressure -r elieving and pressure-limiting devices shall be l ocated so that gas is safely discharged to the outdoors. (2) Discharge stacks or vents shall be designed to pre vent the entry of water, insects, or other foreign

pressure of 14 inches water column or less, overpressure protection devices shall be installed. Piping systems serving equipment designed to operate at inlet pressures greater than 14 inches water column (3.5 kPa) shall be equipped with overpressure protection devices as required by the appliance manufacturer’s installation instructions. [NFPA 54:5.9.1]