Mich. Admin. Code R. 339.5243 - Age limit of standard existing boilers
Rule 243. The age limit of any existing steam boilers of standard construction is dependent on a thorough internal and external inspection and hydrostatic pressure test of 1-1/2 times the allowable working pressure for a period of 30 minutes. If a boiler under these test conditions exhibits no distress or leakage, it may continue to operate at the same working pressure.
Notes
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