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(A) Soil, waste, drain, vent or rain leader pipes, may be of copper tube, Type "M" conforming to A.S.T.M. (American Society for Testing Materials), Specification B88-49.
(B) Copper tube used for soil, waste, drain, vent or rain leader pipes shall be joined with approved cast brass or wrought solder-joint fittings.
(C) Vertical soil, waste or vent stacks may be three-inch Type "M" copper tube; provided, the load does not exceed 34 fixture units and provided the stack is increased at a point below the roof to a distance of two feet above the roof, to four inches where it passes through the roof. Three-inch vertical stacks may carry not more than two water closets.
(D) Horizontal drains may be of three-inch Type "M" copper tube provided the load does not exceed 24 fixture units.
(E) The following table of fixture-unit values, designating the relative load weights of different kinds of fixtures, shall be employed in applying this section.
Fixture Unit Value
Bathtub with 1-1/2-inch trap
Bathtub with 2-inch trap
Combination sink and laundry tub with 1-1/2-inch trap
Dishwasher with 1-1/2-inch trap
Floor drain with 3-inch trap
Kitchen sink with 1-1/2-inch trap
Kitchen sink with 2-inch trap
Lavatory with 1-1/4-inch trap
Lavatory with 1-1/2-inch trap
Laundry tub with 1-1/2-inch trap
Shower head (see note)
Sink-soda fountain or bar with 1-1/4-inch trap
Sink with flush trap
Sink service (slop)
Sink-scullery with 1-1/2-inch trap
Sink-scullery with 2-inch trap
Urinal-stall or washout
Urinal-pedestal, siphon jet and blowout
Wash sink (circular or multiple) each set of faucets with 1-1/2-inch trap
Note: Shower head over bathtub adds no fixture units
(F) Where, in accordance with the provisions of this chapter, three-inch stack is used, the venting of a water closet may be omitted where the distance from the outlet of the closet to the branch in the main waste pipe does not exceed two feet.
(G) A three-inch fresh air inlet may be used where the main drain does not exceed three inches. Where the main drain exceeds three inches, the size of the fresh air inlet shall conform therewith.
(H) Copper tube used for soil, waste, drain, vent or rain leader pipes shall be permanently marked with the name or trademark of the manufacturer, and a mark indicative of the type or gauge at intervals of approximately 12 inches.
(I) The portion of the drain outside the building and more than three feet from the wall of same may be copper tube conforming to the gauge specified in A.S.T.M. Specification B88-49 as Type "K".
(1967 Code, § 16-7) Penalty, see § 10.99