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(a) Single-stage regulators shall have a maximum outlet pressure setting of 1 psi and shall be equipped with one of the following:
(1) An integral pressure-relief device on the outlet-pressure side, having a start-to-discharge pressure setting within the limits specified in the Standard for LP-Gas Regulators, UL 144.
(2) An integral over-pressure shutoff device that shuts off the flow of LP-Gas vapor when the outlet-pressure of the regulator reaches the over-pressure limits specified in UL 144. Such a device shall not open to permit flow of gas until it is manually reset.
(b) Second-stage regulators and integral two-stage regulators shall have a maximum outlet-pressure setting of 14 inches, water column, and shall be equipped with one of the following:
(1) An integral pressure-relief valve on the outlet-pressure side having a start-to-discharge pressure rating within the limits specified in the Standard for LP-Gas Regulators, UL 144. This relief device shall limit the outlet pressure of the second-stage regulator to 2.0 psi when the regulator seat disk is removed and the inlet pressure to the regulator is 10.0 psi or less as specified in the Standard for LP-Gas Regulators, UL 144.
(2) An integral over-pressure shutoff device that shuts off the flow of LP-Gas vapor when the outlet pressure of the regulator reaches the over-pressure limits specified in UL 144. Such a device shall not open to permit flow of gas until it has been manually reset.
Exception: Regulators with a rated capacity of more than 500,000 Btu/hr shall be permitted to have a separate over-pressure protection device complying with Paragraphs 2.9.2 through 2.9.8 of the National Fuel Gas Code, NFPA 54 (ANSI Z223.1) . The over-pressure protection device shall limit the outlet pressure of the regulator to 2.1 psi when the regulator seat disk is removed and the inlet pressure of the regulator is 10 psi or less.
(c) Integral two-stage regulators, except automatic changeover regulators, shall be provided with means to determine the outlet pressure of the high-pressure regulator portion of the integral two-stage regulator.
(d) Integral two-stage regulators shall incorporate an integral pressure-relief valve in the high-pressure regulator portion of the unit.
(e) First-stage regulators shall incorporate an integral pressure-relief valve having a start-to-discharge setting within the limits specified in the Standard for LP-Gas Regulators, UL 144.
Exception: First-stage regulators with a rated capacity of more than 500,000 Btu/hr shall be permitted to have a separate pressure-relief device.
(f) High-pressure regulators with a rated capacity of more than 500,000Btu/hr, where permitted to be used in two-stage systems, shall incorporate an integral relief valve or shall have a separate relief valve.
(g) First-stage regulators shall have an outlet-pressure setting up to 10 psi in accordance with the Standard for LP-Gas Regulators, UL 144.
(h) Regulators shall be designed so as to drain all condensate from the regulator spring case when the vent is directed vertically down.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 13241, Health and Safety Code.
HISTORY:
1. New section filed 12-4-96; operative 1-3-97 (Register 96, No. 49).
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