R 408.11224 General rules for cylinders--II.

Rule 1224. (1) Gases shall not be mixed within a cylinder except by the supplier. (2) A cylinder shall not be placed where it will become a part of the electrical circuit by accidental grounding or where it may be burned by electric welding arc. A cylinder shall not be placed so that hot slag or flame will reach it or it shall be protected by a fire resistant shield. An electrode shall not be tapped against a cylinder to strike an arc. (3) A regulator, gauge, or hose shall not be interchangeable between fuel gas, oxidizing gas or inert gas. Connections for compressed gas cylinders shall be as prescribed in ANSI B57.1- “Compressed Gas Cylinder Valve Outlet and Inlet Connections,” 1965 edition, as adopted in R 408.11202. (4) A cylinder valve shall be opened slightly for an instant and then closed before connecting to a regulator or manifold to clear the valve of dust and dirt. This shall not be done near a source of ignition. Pressure to a regulator shall be introduced by slowly opening the cylinder valve. An acetylene cylinder valve shall not be opened more than 1 1/2 turns of the spindle. (5) Acetylene shall not be utilized or piped, except in cylinder manifolds, at a pressure in excess of 15 psig. (6) Only the owner of the cylinder, if the owner is qualified, or a person trained, qualified, and authorized by the owner, shall refill a cylinder.