This information is provided free of charge by the Department of Industrial Relations from its web site at These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at

Subchapter 7. General Industry Safety Orders
Group 10. Gas Systems for Welding and Cutting
Article 86. Manifolding of Cylinders to Headers for Shop Pipe Line Supply Systems and Pressure Reducing Regulators and Hose

Return to index
New query

§4839. Hose.

(a) Fuel gas hose and oxygen hose shall be easily distinguished from each other. The contrast may be either by different colors or by surface characteristics readily distinguishable by the sense of touch. Oxygen and fuel gas hoses shall not be interchangeable. A single hose having more than one passage shall not be used.

NOTE: Red is generally accepted as the color for fuel gas, while green is used for oxygen hose.

(1) Hose for oxy-fuel gas service shall comply with the Specification for Rubber Welding Hose, 1979, Rubber Manufacturers Association.

(2) When parallel lengths of oxygen and acetylene hose are taped together for convenience and to prevent tangling, not more than 4 inches out of 12 inches shall be covered by tape.

(3) Hose connections shall comply with the Standard Connections for Regulator Outlets, Torches and Fitted Hose for Welding and Cutting Equipment, Compressed Gas Association, Pamphlet E-1-1980.

(4) Hose connections shall be clamped or otherwise securely fastened in a manner that will withstand, without leakage, twice the pressure to which they are normally subjected in service, but in no case less than a pressure of 300 p.s.i. Oil-free air or an oil-free inert gas shall be used for the test.

(5) Manifold hose connections, including both ends of the supply hose that lead to the manifold, shall be such that the hose cannot be interchanged between fuel gas and oxygen manifolds and supply header connections. Adapters shall not be used to permit the interchange of hose. Hose connections shall be kept free of grease and oil.

(6) All hose in use, carrying acetylene, oxygen, natural or manufactured fuel gas, or any gas or substance which may ignite or enter into combustion, or be in any way harmful to employees, shall be inspected at the beginning of each working shift.

(7) Hose which has been subject to flashback, or which shows evidence of severe wear or damage, shall be tested to twice the normal pressure to which it is subject, but in no case less than 300 p.s.i. Defective hose, or hose in doubtful condition, shall not be used.

(8) Hose showing leaks, burns, worn places, or other defects rendering it unfit for service shall be repaired or replaced.

(9) Boxes used for the storage of gas hose shall be ventilated.

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


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

2. Amendment of subsection (a) filed 2-20-80; effective thirtieth day thereafter (Register 80, No. 8).

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

Go BackGo Back to Article 86 Table of Contents