Pennsylvania Statutes Title 52 P.S. Mines and Mining § 690-263. Storage of oxygen and gas

(a) General rule.--All oxygen and gas tanks or cylinders shall be properly secured and protected against possible damage when stored in and about bituminous coal mines. When oxygen and gas tanks or cylinders are stored in underground shops or surface structures, they shall be protected from damage by falling material and secured in an upright position. Not more than a one-week supply of oxygen or gas shall be stored in any underground or surface shop. This quantity shall be determined in agreement with the department.

(b) Valves and hoses.--The valves on oxygen and gas tanks or cylinders shall be closed. The hoses shall be removed when not in actual use, except in a properly ventilated and protected underground machine shop or surface structure. Valves on empty tanks or cylinders shall be kept closed.