Always use a cylinder wrench or another tightly fitting wrench to tighten the regulator nut and hose connections. Do not use a wrench to open or close a hand wheel type cylinder valve. If it cannot be operated by hand, the valve should be repaired. G. Stand to the side of the regulator when opening the cylinder valve. H. Do not attempt to repair cylinder valves or their relief devices while a cylinder contains gas pressure.
Tag leaking cylinders or cylinders with stuck valves and move to a safe, secure outdoor location.
For additional information refer to NFPA 55 Storage, Use, and Handling of Compressed and Liquefied Gases in Portable Cylinders and NFPA 45 Fire Protection for Laboratories Using Chemicals.