MSHA - Code of Federal Regulations - 30 CFR 56.4603
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MSHA - Title 30 CFR
30 CFR § 56.4603
Closure of valves.

To prevent accidental release of gases from hoses and torches attached to oxygen and acetylene cylinders or to manifold systems, cylinder or manifold system valves shall be closed when

(a) The cylinders are moved;

(b) The torch and hoses are left unattended; or

(c) The task or series of tasks is completed.