The standard for repairs/alterations is:

1. (1) National Board Inspection Code (NBIC), current edition Part 3, excluding Section 6, Supplements 1, 5, 6, and 7 which may be used as nonmandatory guidelines.
2. (2) The standard for repair of historical boilers or riveted construction preserved, restored, or maintained for hobby or demonstration use, shall be Part 3, Section 6, Supplement 2 of the National Board Inspection Code (NBIC) current edition.

[Statutory Authority: Chapter 70.79 RCW. WSR 18-23-092, § 296-104-502, filed 11/20/18, effective 1/1/19; WSR 18-01-113, § 296-104-502, filed 12/19/17, effective 1/31/18; WSR 14-13-087, § 296-104-502, filed 6/17/14, effective 8/1/14. Statutory Authority: RCW 70.79.030, 70.79.040, 70.79.150, 70.79.290, 70.79.330, and 70.79.350. WSR 08-24-072, § 296-104-502, filed 12/1/08, effective 1/1/09; WSR 06-24-042, § 296-104-502, filed 11/30/06, effective 1/1/07. Statutory Authority: Chapter 70.79 RCW. WSR 04-21-069, § 296-104-502, filed 10/19/04, effective 1/1/05. 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. WSR 02-23-036, § 296-104-502, filed 11/13/02, effective 12/14/02; WSR 01-24-061, § 296-104-502, filed 11/30/01, effective 12/31/01. Statutory Authority: RCW 70.79.030, 70.79.040 and chapter 70.79 RCW. WSR 00-21-024, § 296-104-502, filed 10/10/00, effective 11/13/00. Statutory Authority: RCW 70.79.030 and 70.79.040. WSR 99-22-026, § 296-104-502, filed 10/26/99, effective 11/26/99; WSR 98-22-024, § 296-104-502, filed 10/28/98, effective 11/28/98. Statutory Authority: RCW 70.79.040. WSR 94-21-002, § 296-104-502, filed 10/5/94, effective 11/5/94.]