Australia Model Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace J1: Appendix J: Test, store and handle gas cylinders, including used and empty ones

Used or empty cylinders keep residual hazards and need the same precautions as full ones. Cylinders must be tested periodically (AS 2030.1): as a guide every 10 years for dry gases and more often for damp or corrosive gases, with the last test date stamped near the valve or on the collar or foot ring. A cylinder past its test date should not be refilled until retested, although its contents may be used up, and owners should keep test records. For storage: keep caps and valve protection in place, keep the valve closed when not in use including when empty, secure against movement with chains, do not lubricate valves or repair leaks (move a leaking cylinder outdoors and get expert help), and keep a water hose or extinguisher handy and use water spray to keep it cool in a fire. Cylinders of liquefied flammable gas must be positioned so the relief device contacts vapour, usually upright. Standards cover specific gases such as ammonia, cryogenic liquids, chlorine, natural gas, LP gas and welding gases.