1. The maximum allowable pressure of a boiler carrying the ASME code symbol or of a pressure vessel carrying the ASME or API-ASME code symbol shall be determined by the applicable sections of the code under which it was constructed and stamped, or a later edition of the ASME code, provided that the rerating has been performed in accordance with the rules of such later edition.

2. The maximum allowable pressure of a boiler or pressure vessel which does not carry the ASME or the API-ASME code symbol shall be computed in accordance with the inspection code of the National Board of Boiler and Pressure Vessel Inspectors, or, when applicable, ANSI/API Standard 510, Pressure Vessel Inspection Code, unless the pressure vessel is of a special construction, in which case the board may grant at its discretion a special installation and operating permit for a pressure vessel of special design or construction, consistent with the safety objectives of the rules and regulations.

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3. Sections 650.200 to 650.290 shall not be construed as in any way preventing the use, sale or reinstallation of a boiler or pressure vessel referred to in this section, provided it has been made to conform to the rules and regulations of the board governing existing installations; and provided, further, it has not been found upon inspection to be in an unsafe condition.