All boilers and all unfired pressure vessels to be installed in this state after the twelve-month period from the date upon which the rules of the board shall become effective shall be inspected during construction as required by the applicable rules of the board by an inspector authorized to inspect boilers and unfired pressure vessels in this state, or, if constructed outside of the state, by an inspector holding a certificate from the national board of boiler and pressure vessel inspectors, or a certificate of competency as an inspector of boilers and unfired pressure vessels for a state that has a standard of examination substantially equal to that of this state as provided in RCW 70.79.170.