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Subchapter 4. Construction Safety Orders
Article 32. Oxygen, Acetylene, and Fuel Gas

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§1742. Hose and Connections.

(a) Fuel gas hose and oxygen hose shall be easily distinguished from each other.

Note: The contrast may be made by different colors or by surface characteristics readily distinguishable by the sense of touch.

(b) A single hose having more than 1 gas passage shall not be used as a connection between torch and gas outlet if a wall failure would permit the flow of either gas into the other passage.

(c) Hoses used for liquefied petroleum gas, such as butane or propane, shall be of, or lined with, materials that are resistant to the action of LP-Gas. They shall be designed for a bursting pressure of at least 1,250 psi, and shall be marked every 5 feet with the letters “LPG.” Hoses over 1/2 inch diameter shall also be marked with the manufacturer's name.

(d) The connection between fuel source and burner shall be with extra heavy steel pipe (Schedule 80), flexible metallic tubing or hose suitable for the service, and where exposed shall be protected against physical damage.

(e) When not in use, manifold and header hose connections shall be capped. As used in this subsection, “manifold” means a device used to connect the outlets of one or more gas cylinders to a central piping system, and “header” means a pipe or duct through which liquid or gas is conveyed and supplied to or received from multiple branches.

(f) When parallel sections or oxygen and fuel gas hose are taped together, not more than 4 inches out of 12 inches shall be covered by tape.

(g) Hose couplings shall be of the type that cannot be unlocked or disconnected by means of a straight pull without rotary motion.

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


1. New subsections (e)-(g) filed 5-21-75; effective thirtieth day thereafter (Register 75, No. 21).

2. Amendment of subsections (a), (b) and (d) filed 1-5-87; effective thirtieth day thereafter (Register 87, No. 2).

3. Amendment of subsection (e) filed 12-9-2010; operative 1-8-2011 (Register 2010, No. 50).

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