Oil and Gas Occupational Safety and Health Regulations

6.9 (1) Where a pressure vessel is used to store anhydrous ammonia, a hydrostatic test at a pressure equal to one and one-half times the maximum allowable working pressure shall be conducted at least once every five years.

(2) The integrity of a pressure vessel that is a part of a motion compensator system or blowout preventer shall be verified at least once every five years by

• (a) where practicable, an internal inspection; or

• (b) where an internal inspection is not practicable, by a hydrostatic test or other non-destructive test method.