Section R. 325.1654 - Pump installation; water suction linesRule 154.
(1) A water suction line shall be constructed of copper, galvanized steel, plastic pipe or other material that is approved, in writing, by the director.(2) A water suction line that is outside the well casing shall be protected by utilizing 1 or more of the following methods: (a) By fully exposing the line and by situating the line not less than 12 inches above the floor of an approved basement, basement offset, or pump room.(b) By fully exposing the line above ground surface.(c) By situating the line within an outer casing with the annular space filled with water from the system and maintained at system pressure.(d) By surrounding the line by air space in a straight rigid conduit which does not have joints and which has positive drainage by gravity to the ground surface or to an approved basement, basement offset, or pump room, with the conduit directly connected to the well casing by a threaded or welded watertight joint. The openings into the casing shall be welded watertight or shall be sealed in accordance with the provisions of R 325.1641 to R 325.1643 and the total length of the suction line that is protected by the gravity drained conduit shall not be more than 20 feet.Mich. Admin. Code R. 325.1654