Regulations Made Under Part II of the Canada Labour Code Respecting Occupational Safety and Health of Employees Employed on or in Connection with Exploration or Drilling for, or the Production, Conservation, Processing or Transportation of, Oil or Gas in Canada Lands, as Defined in the Canada Oil and Gas Act

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.