Canada Occupational Health and Safety Regulations

5.16 (1) The installation of a buried pressure vessel shall meet the requirements set out in Appendix A to Part I of the Boiler Code.

(2) Notice of the proposed backfilling shall be given to a health and safety officer at the regional office or district office before backfilling is done over a pressure vessel.

(3) If test plates are used as an indication of corrosion of a buried pressure vessel, the test plates and, subject to subsection (4), the pressure vessel shall be completely uncovered and inspected by an inspector at least once every three years.

(4) If, on an inspection referred to in subsection (3), the test plates show no corrosion, the buried pressure vessel may be completely uncovered and inspected at intervals exceeding three years if the employer, immediately after the inspection, notifies in writing a regional health and safety officer at the regional office or district office of the condition of the test plates and of the proposed inspection schedule for the pressure vessel.

(5) Every buried pressure vessel shall be completely uncovered and inspected at least once every 15 years.