1308.9 Overpressure Protection Devices

Overpressure protection devices shall be one of the following:

(1) Pressure relief valve.

(2) Monitor regulator.

(3) Series regulator installed upstream from the line regulator and set to continuously limit the pressure on the inlet of the line regulator to the maximum values specified by Section 1308.8 or less.

(4) Automatic shutoff device installed in series with the line pressure regulator and set to shut off when the pressure on the downstream piping system reaches the maximum values specified by Section 1308.8 or less. This device shall be designed so that it will remain closed until manually reset. [NFPA 54:5.8.3.1]

1308.9.1 Separate Devices. The devices in Section 1308.9 shall be installed either as an integral part of the service or line pressure regulator or as separate units. Where separate overpressure protection devices are installed, they shall comply with Section 1308.9.2 through Section 1308.9.7. [NFPA 54:5.8.3.2]

1308.9.2 Construction and Installation. All overpressure protection devices shall meet the following requirements:

(1) Be constructed of materials so that the operation of the device is not impaired by corrosion of external parts by the atmosphere or of internal parts by the gas.

(2) Be designed and installed so they can be operated to determine whether the valve is free. The devices shall also be designed and installed so they can be tested to determine the pressure at which they operate and be examined for leakage when in the closed position. [NFPA 54:5.8.4]

1308.9.3 External Control Piping. External control piping shall be designed and installed so that damage to the control piping of one device does not render both the regulator and the overpressure protective device inoperative. [NFPA 54:5.8.5]

1308.9.4 Setting. Each pressure limiting or pressure relieving device shall be set so that the gas pressure supplied to the connected appliance(s) does not exceed the limits specified in Section 1308.8 and Section 1308.8.1.

[NFPA 54:5.8.6]

1308.9.5 Unauthorized Operation. Where unauthorized operation of any shutoff valve could render a pres

FUEL GAS PIPING

TABLE 1308.12

MANUAL GAS VALVE STANDARDS

[NFPA 54: TABLE 5.11]

SHUTOFF VALVE APPLICATION	STANDARDS
Appliance shutoff valve up to1_/_2 psi	CSA/ANSI Z21.15/CSA 9.1
Appliance shutoff valve up to1_/_2 psi	ASME B16.44
Appliance shutoff valve up to1_/_2 psi	ASME B16.33 marked 125 G
Appliance shutoff valve up to1_/_2 psi	CSA/ANSI LC 4/CSA 6.32
Valve up to1_/_2 psi	ASME B16.44
Valve up to1_/_2 psi	ASME B16.33 marked 125 G
Valve up to1_/_2 psi	CSA/ANSI LC 4/CSA 6.32
Valve up to 2 psi	ASME B16.44 labeled 2G
Valve up to 2 psi	ASME B16.33 marked 125 G
Valve up to 2 psi	CSA/ANSI LC 4/CSA 6.32 with ANSI/ASME B16.44 labeled 2G or labeled 5G
Valve up to 2 psi	CSA/ANSI LC 4/CSA 6.32 with ANSI/ASME B16.33 marked 125 G
Valve up to 5 psi	ASME B16.44 labeled 5G
Valve up to 5 psi	ASME B16.33
Valve up to 5 psi	CSA/ANSI LC 4/CSA 6.32 with ANSI/ASME B16.44 marked 5G
Valve up to 5 psi	CSA/ANSI LC 4/CSA 6.32 with ANSI/ASME B16.33 marked 125 G
Valve up to 125 psi	ASME B16.33 marked 125 G
Valve up to 125 psi	CSA/ANSI LC 4/CSA 6.32 with ASME B16.33 marked 125 G

For SI Units: 1 pound-force per square inch = 6.8947 kPa