Mich. Admin. Code R. 339.5240 - Age limit of nonstandard existing steam boilers
Rule 240. The age limit of any existing steam boilers of nonstandard construction, installed before July 1, 1966, is 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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