.-(1) Welded cylinders shall not be used for filling any permanent or high pressure liquefiable gas or highly toxic gases like Boron trifluoride, Carbonyl chloride (Phosgene), Chlorine trifluoride, Cyanogen, Cyanogen chloride, Hydrogen cyanide, Hydrogen sulphide.(2)No cylinder, which has once been used for storage and transportation of Coal gas, Carbon monoxide or Methane, shall be used for filling with any other gas except mixture of these gases with inert gases.(3)No cylinder shall be filled with any gas that is capable of combining chemically so as to endanger its serviceability.
