Mich. Admin. Code R. 408.4218 - Safety valve capacity
Rule 218. The safety valve capacity of each boiler shall be such that the safety valve or valves will discharge all the steam that can be generated by the boiler without allowing the pressure to rise more than 6% above the highest pressure to which any valve is set, and in no case to more than 6% above the maximum allowable working pressure. The steam safety valve capacity for each steam heating boiler shall be such that with the fuel-burning equipment installed, the pressure cannot rise more than 5 psi above the maximum allowable working pressure of the boiler.
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