Mich. Admin. Code R. 408.30530 - [Effective 8/29/2025] Requirements for discharge pipe
Rule 530. Section P280 4.6.1 of the code is amended to read as follows:
P280 4.6.1.
Requirements for discharge pipe. Relief valves shall not discharge so as to be
a hazard, a potential cause of damage, or a nuisance.
A relief valve discharge pipe shall be provided for each individual relief valve and shall meet all of the following:
(a) Shall terminate atmospherically not more
than 4 inches, 102 millimeters, from the floor with an unthreaded
end.
(b) Shall not be
interconnected.
(c) Valves shall
not be connected in the relief valve discharge pipe.
(d) Shall be rigid pipe approved for water
distribution, with a minimum temperature rating of 210 degrees
Fahrenheit.
(e) Shall have the same
nominal inside diameter as the relief valve outlet and shall drain by gravity
flow.
(f) Shall discharge to the
floor, or to the pan serving the water heater or storage tank, or to a waste
receptor.
The outlet of a pressure, temperature, or other relief valve shall not be directly connected to the drainage system.
Notes
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