Sets out requirements for the approval, filling, handling, inspection, testing, and maintenance of refillable gas cylinders for the storage and transport of compressed gases, where the cylinders exceed 0.1 kg but do not exceed 500 kg water capacity, other than acetylene and gases in vacuum-insulated cylinders. This Standard does not apply to cylinders forming part of aircraft equipment and used solely in aircraft. This Standard specifies requirements for gas cylinders in fire extinguisher systems and fire extinguishers, unless requirements are given in another Australian Standard.