Mich. Admin. Code R. 408.4290 - Marking of safety or relief valves

Rule 290. Each safety or relief valve shall be plainly marked by the manufacturer in such a way that the markings will not be obliterated in service. The markings shall be cast or stamped on the valve body or on the lifting lever, providing the lifting lever is permanently attached to the valve, or, when desirable because of size, all or part of the required markings may be stamped, cast or etched on a plate or plates, each securely fastened to the valve body, lever or other permanent part of the valve, and such markings shall include the following:

(a) The name or identifying trademark of manufacturer.
(b) Size _____________________________ inches.

(The pipe size of the inlet)

(c) Pressure _________________________________________ psi.

(The pressure at which it is set to blow)

(d) Capacity ____________________________ lb. per hour, or

Capacity ______________________________ Btu per hour in accordance with Par. H-51(d) ASME code.

(e) ASME symbol as shown in Fig. H-4 ASME code.


Mich. Admin. Code R. 408.4290
1979 AC

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