Mich. Admin. Code R. 408.4202 - Age limit of nonstandard existing steam boilers
Rule 202. The age limit of any boiler of nonstandard construction, installed prior to the date this law became effective, shall be 30 years except that after a thorough internal and external inspection and a hydrostatic pressure of 1 1/2 times the allowable working pressure and held for a period of at least 30 minutes, during which no distress or leakage develops, any boilers having other than a lap-riveted longitudinal joint may be continued in operation without reduction in working pressure.
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