You must construct and test containers, with a design pressure exceeding 15 psig, according to the Unfired Pressure Vessel Code.
Wash. Admin. Code § 296-826-30030
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 06-10-067, § 296-826-30030, filed 5/2/06, effective 9/1/06.