Section R. 408.16531 - Steam pressure proceduresRule 6531.
(1) Where a pressure reducing valve is used, not less than 1 relief valve, set at not more than the rated pressure of the equipment, shall be provided adjacent to the reducing valve on the low pressure side. The relief valve shall vent to an area which will not create a hazard to an employee.(2) A steam valve to machinery shall be opened slowly to avoid uneven expansion of a pressure chamber.(3) A cylinder-type machine shall be in motion before steam is admitted.(4) The rated operating steam pressure of a machine shall not be exceeded.Mich. Admin. Code R. 408.16531