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(a) Distribution lines shall be installed and maintained in a safe operating condition. All piping shall be run directly as practicable, protected against physical damage, proper allowance being made for expansion and contraction, jarring and vibration. Pipe laid underground in earth shall be located below the frost line and protected against corrosion. After assembly, piping shall be thoroughly blown out with air, nitrogen, or carbon dioxide to remove foreign materials. For oxygen piping, only oil-free air, oil-free nitrogen, or oil-free carbon dioxide shall be used.
(b) Oxygen piping shall never be placed in tunnel, trench, manhole or duct where it may be exposed to contact with oil.
(c) Only piping which has been welded or brazed shall be installed in tunnels, trenches or ducts. Shutoff valves shall be located outside such conduits. Oxygen piping may be placed in the same tunnel, trench or duct with fuel-gas pipelines, provided there is good natural or forced ventilation.
(d) All drip pots shall be readily accessible and provided with outlets normally closed with screw caps or plugs. No open end valves or pet-cocks shall be used.
(e) Gas cocks or valves shall be provided for all buildings at points outside the buildings where they will be readily accessible for shutting off gas supply to buildings in any emergency.
NOTE: Authority cited: Section 142.3 Labor Code. Reference: Section 142.3, Labor Code.
1. Amendment of subsections (a) and (c) filed 5-16-75; effective thirtieth day thereafter (Register 75, No. 20).
2. Amendment of subsections (a) and (c) filed 6-12-87; operative 7-12-87 (Register 87, No. 26).