RCW 70.79.040: Rules and regulations—Scope.

The board shall promulgate rules and regulations for the safe and proper installation, repair, use and operation of boilers, and for the safe and proper installation and repair of unfired pressure vessels which were in use or installed ready for use in this state prior to the date upon which the first rules and regulations under this chapter pertaining to existing installations became effective, or during the twelve months period immediately thereafter.