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Subchapter 7. General Industry Safety Orders
Group 10. Gas Systems for Welding and Cutting
Article 85. Service Piping for All Gases

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§4828. Hydraulic Back-Pressure Valves.

(a) In low-pressure fuel gas systems, including acetylene, liquefied petroleum gas, manufactured gas, natural gas, etc., where the gas is piped at a pressure not in excess of 1 p.s.i., an approved hydraulic back-pressure valve shall be employed at every point where fuel gas and oxygen are withdrawn from the piping system. A shut-off valve shall be installed at the inlet of each hydraulic valve.

(b) In fuel gas systems where the gas is piped at a pressure in excess of 1 p.s.i. an approved service regulator, check valve or hydraulic seal shall be employed at every point where fuel gas and oxygen are withdrawn from the piping system. A shut-off valve shall be installed at the inlet of each hydraulic seal, regulator or check valve. Fuel gas for use with equipment not requiring oxygen shall be withdrawn upstream of the piping protective devices.

(c) Maintenance and inspection of hydraulic back-pressure valves shall be in accordance with manufacturer's instructions.

(d) If the station outlet is equipped with a detachable regulator, the outlet shall terminate in a union connection that complies with the Standard Connections for Regulator Outlets, Torches and Fitted Hose for Welding and Cutting Equipment, Compressed Gas Association, Pamphlet E-1-1980.

If the station outlet is connected directly to a hose, the outlet shall terminate in a union connection complying with the Standard Connections for Regulator Outlets, Torches and Fitted Hose for Welding and Cutting Equipment, Compressed Gas Association, Pamphlet E-1-1980.

Station outlets may terminate in pipe threads to which permanent connections are to be made, such as to a machine.

Station outlets shall be equipped with a detachable outlet seal cap secured in place. This cap shall be used to seal the outlet except when a hose, a regulator, or piping is attached.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

HISTORY

1. Amendment of subsection (b) and new subsection (d) filed 5-16-75; effective thirtieth day thereafter (Register 75, No. 20).

2. Amendment of subsections (a) and (b) filed 7-13-78; effective thirtieth day thereafter (Register 78, No. 28).

3. Amendment filed 6-12-87; operative 7-12-87 (Register 87, No. 26).

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