Mich. Admin. Code R. 408.4242 - Pressure gauges

Rule 242.

(1) Each steam boiler shall have a pressure gauge, with dial range not less than 1 1/2 times the maximum allowable working pressure, connected to the steam space or to the steam connection to the water column.
(2) The pressure gauge shall be connected to a siphon or equivalent device of sufficient capacity to keep the gauge tube filled with water and so arranged that the gauge cannot be shut off from the boiler except by a cock placed near the gauge and provided with a tee or lever handle arranged to be parallel to the pipe in which it is located when the cock is open.
(3) When a pressure gauge connection longer than 8 feet becomes necessary, a shutoff valve may be used near the boiler provided the valve is of the outside-screw-and-yoke type and is locked open. The line shall be of ample size with provision for free blowing.
(4) Each boiler shall be provided with a 1/4-inch nipple and globe valve connected to the steam space for the exclusive purpose of attaching a test gauge when the boiler is in service so that the accuracy of the boiler pressure gauge may be ascertained.
(5) The scale on the dial of a steam heating boiler shall be graduated to not less than 30 psi. The travel of the pointer from 0 to 30 psi shall be at least 3 inches.


Mich. Admin. Code R. 408.4242
1979 AC

State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.

No prior version found.