Michigan Compiled Laws, Chapter 339. Occupational Code § 339.5913

Sec. 913. (1) The maximum allowable pressure of a boiler that carries the American Society of Mechanical Engineers' code symbol shall be determined by the applicable sections of the code under which it was constructed and stamped.

(2) The maximum allowable pressure of a boiler that does not carry the American Society of Mechanical Engineers' code symbol may be computed in accordance with the inspection code of the National Board of Boiler and Pressure Vessel Inspectors.

(3) This article shall not be construed in a manner that prevents the use, sale, or reinstallation of an existing boiler, if the boiler is made to conform to the rules and regulations of the board that governs existing installations and is found on inspection to be in a safe condition.