You must ensure that the piped systems for the in-plant transfer and distribution of nitrous oxide are designed, installed, maintained, and operated in accordance with Compressed Gas Association Pamphlet G8.1-1964.
Wash. Admin. Code § 296-24-325
Order 73-5, § 296-24-325, filed 5/9/73 and Order 73-4, § 296-24-325, filed 5/7/73.