1. No user shall use, cause or permit a vessel under pressure or gas fuel system, including all automatic controls, indicators and appurtenances, to be used unless it is at all times maintained in a safe working condition and the efficiency thereof is proved by regular testing.
2. No user shall use or cause or permit a vessel under pressure to be used unless it is kept clean and free from any:
a. carbonized oil or other inflammable material which may ignite under working conditions;
b. material which may cause corrosion; or
c. material which is liable to chemical reaction which may cause an uncontrolled rise in pressure.