(A) All building sewers (leads) shall meet or exceed the requirements of the ordinances of the city or the requirements of this chapter, whichever shall be most stringent.
(B) Building sewers hereinafter installed shall consist of pipes and fittings of the following types and sizes:
(1) Pipe must be of sufficient diameter to carry the estimated volume of discharge. Minimum pipe size permitted is four-inch inside diameter.
(2) Pipe must be one of the following materials and cannot be mixed in the connection lines to include the fittings:
(a) Cast iron with rubber-type gaskets or leaded joint;
(b) Cast iron no hub pipe with neoprene stainless couplings;
(c) Ductile iron with rubber-type gaskets, slip joint or mechanical joint;
(d) Vitrified clay tile with ASTM C425 joints;
(e) Reinforced concrete with ASTM C443 joints;
(f) PVC plastic, Schedule 40 or better;
(3) No tees, double tees, or crosses, or double hub pipes shall be permitted;
(4) Old building sewers or portions thereof may be used in connection with new buildings only when they are found on examination and tested by the Inspector to meet all requirements of this chapter; and
(5) All changes in grades or direction shall be made with appropriate fittings.
(C) Clean-outs shall be installed every 100 feet of straight run and at each 90-degree direction change, and all clean-outs shall be plugged.
(D) All lines shall be laid at a minimum slope of one-eighth- inch per foot grade and a maximum slope of one-half-inch per foot grade for four-inch lines and at a minimum of one-eighth-inch per foot grade and a maximum one- half-inch per foot grade for six-inch lines.
(E) The method to be used in excavating, placing of pipe, jointing, testing, and backfilling the trench, shall conform to the requirements of the Plumbing Code Rules (Part 7) issued by the Michigan Department of Labor Construction Code Commission and the regulations of the city where applicable.
(F) All joints and connections shall be gas tight and shall conform to the requirements of the current building and plumbing codes.
(G) Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. No building sewer shall be laid parallel to or within three feet of any bearing wall, which might thereby be weakened. The depth shall be sufficient to afford protection from frost. All excavations required for the installation of a building sewer shall be open trench work unless otherwise approved by the Inspector. Pipe laying and backfill shall be performed in accordance with current ASTM Specifications except that no backfill shall be placed until the work has been inspected by the Inspector or his or her representative.
(H) In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by an approved pumping system and discharged to the building sewer.
(I) All excavations for building sewer installation and connection shall be adequately guarded by barricades and lighting so as to protect the public from hazards. Streets, sidewalks, alleys, parkways and other public property disturbed in the course of the installation and connection work shall be restored in the manner set forth in Chapter 99 of this code.
(J) The connection of the building sewer into the public sewer shall be made at the "Y" branch designated for that property, if such branch is available at a suitable location. Any connection not made at the designated "Y" branch in the main sewer shall be made only as directed by the Inspector and approved by the Manager. All taps directly into the main require the use of a boring machine.
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21) Penalty, see § 51.999