WAC 296-104-230   Construction -- What are the testing requirements for new boilers or unfired pressure vessels exempted from code requirements for volume, pressure or temperature?  Boilers or unfired pressure vessels that are not required by the codes adopted in WAC 296-104-200 to be built to those codes (except those exempted in the RCWs), shall be tested as follows:

     One boiler or unfired pressure vessel of each design and size taken from the manufacturer's stock at random, shall be subjected to a hydrostatic test of twice the rated maximum allowable working pressure in the presence of an inspector holding a national board commission. The boiler or unfired pressure vessel shall withstand the hydrostatic pressure test without leaks and without exceeding 80% of the boiler or unfired pressure vessel material's yield strength. Samples shall be taken from the longitudinal seam and tests made as outlined in Section IX ASME Code for root and face bends and reduced tensile coupons. Upon successfully passing the above tests, the maximum allowable working pressure will be allowed for all boilers or unfired pressure vessels constructed to identical specifications. The company name, serial number, maximum allowable working pressure, and energy input (if applicable) shall be stamped or marked in a permanent manner on each boiler or unfired pressure vessel. A retest shall be made at the inspector's discretion or by the request of the chief inspector. Any unfired pressure vessels containing water and an air cushion designed for less than 300 psi and 210 degree F, in use prior to January 1, 1997, may be accepted by hydrostatically testing them to twice their maximum allowable working pressure.



[Statutory Authority: RCW 70.79.030, 70.79.040, 70.79.150, 70.79.290, 70.79.330, 70.79.350, and chapter 70.79 RCW. 02-23-036, § 296-104-230, filed 11/13/02, effective 12/14/02. Statutory Authority: RCW 70.79.030, 70.79.040 and chapter 70.79 RCW. 00-21-024, § 296-104-230, filed 10/10/00, effective 11/13/00. Statutory Authority: RCW 70.79.030 and 70.79.040. 96-21-081, § 296-104-230, filed 10/16/96, effective 11/16/96; Order 74-37, § 296-104-230, filed 11/8/74; Part IV, § 7, filed 3/23/60.]