Historical boilers and pressure vessels not previously registered may be used in this state provided they meet all the requirements for historical boilers in the National Board Inspection Code and have prior approval of the board of boiler rules.

Historical boilers and pressure vessels from outside the jurisdiction can be used subject to the approval of the chief inspector, provided they have been registered in another national board jurisdiction and have been inspected and maintained in accordance with all requirements for historical boilers in the National Board Inspection Code.

The object will be subject to regular periodic inspections as required in WAC 296-104-100.