You must ensure that compressed gas cylinders, portable tanks, and cargo tanks have pressure relief devices installed and maintained in accordance with Compressed Gas Association Pamphlets S-1.1-1963 and 1965 addenda and S-1.2-1963.
Wash. Admin. Code § 296-24-29505
Order 73-5, § 296-24-29505, filed 5/9/73 and Order 73-4, § 296-24-29505, filed 5/7/73.