Why do LP gas cylinders need to be retested?
In Australia, BBQ gas bottles must be tested every ten years.
When that test date expires the gas bottle must be re-inspected by an Australian certified test station and the neck ring re-stamped and dated.
The gas bottles are subject to internal and external inspection for rust and any other damage
Normally, if the bottle has been kept either full of LPG or empty with the valve closed, internal rust and corrosion are not a problem.
Any gas bottle that fails to meet the Standard is condemned