Mich. Admin. Code R. 408.4288 - Area of and support of relief valve discharge pipes
Rule 288.
(1)
When a discharge pipe is used, its area shall be not less than the area of the
valve or aggregate area based on the nominal diameters of the valves with which
it connects, and the discharge pipe shall be fitted with an open drain to
prevent water from lodging in the upper part of the valve or in the pipe. When
an elbow is placed on a relief-valve discharge pipe, it shall be located close
to the valve outlet. The pipe shall be supported so that no undue stress is
placed on the valve body.
(2) The
discharge from relief valves shall be arranged so that there will be no danger
of scalding attendants.
Notes
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