Allowance for state specials

If, due to a valid impediment to compliance with the American Society of Mechanical Engineers Code in its entirety, an unfired pressure vessel cannot bear the American society of mechanical engineers and national board stamping, details in the English language, and specifications and calculations, approved by a registered professional engineer experienced in pressure vessel design, must be submitted to the chief inspector by the owner or user. Approval as "state special" must be obtained from the chief inspector before construction is started.