Section 4516.5 - LPG - Gas Container Safety Relief Devices(a) Department of Transportation (DOT) containers shall be provided with safety relief devices as required by the regulations of the U. S. Department of Transportation. ASME containers shall be provided with relief valves in accordance with Subsection 2.3.2 of the Liquefied Petroleum Gas Code (NFPA No. 58, 2001 (ANSI)), incorporated by reference herein. Safety relief valves shall have direct communication with the vapor space of the vessel.(b) Final stage regulators shall be equipped on the low pressure side with one or both of the following: (1) A relief valve having a start-to-discharge pressure setting of not less than 1.7 times and not more than three (3) times the delivery pressure of the regulator.(2) A shutoff device that shuts the gas off at the inlet side when the downstream pressure reaches the overpressure limits of not less than 1.7 times and not more than three (3) times the delivery pressure of the regulator. Such a device shall not open to permit flow of gas until it has been manually reset.(c) Systems installed outside of a commercial modular shall be so located that discharge from safety relief devices shall be not less than three (3) feet (0.9m) horizontally away from any openings into the commercial modular and from all the internal combustion engine exhaust termination(s) below the level of such discharge. When a system is located in a recess vaportight to the inside, vent openings to the exterior shall be not less than three (3) feet (0.9m) horizontally away from any opening into the interior of the unit below the level of these vents.(d) Systems located near doors without screens or openable windows below the level of the gas compartment vents are exempt from the requirement of Subsection (c) of this section.(e) Safety relief valves located within liquefied petroleum gas (LPG) container compartments may be less than three (3) feet (0.9m) from openings provided:(1) The bottom vent of the compartment is at the same level or lower than the bottom of any opening into the interior.(2) The compartment is not located on the same wall plane as the opening(s) and is at least two (2) feet (0.6096m) horizontally from such openings.Cal. Code Regs. Tit. 25, § 4516.5
1. New section filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).
2. Repealer and new section heading, section and NOTE filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38). Note: Authority cited: Section 18015, Health and Safety Code. Reference: Section 18025, Health and Safety Code.
1. New section filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).
2. Repealer and new section heading, section and Note filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38).