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.
Notes
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No prior version found.