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712.3 Ejector design.
The ejector pit and discharge piping shall conform to the requirements of Sections 712.3.1 through 712.3.5.
712.3.1 Ejector pump.
The ejector pump capacity and head shall be appropriate to anticipated use requirements.
712.3.2 Ejector pit.
The ejector pit shall be not less than 18 inches (457 mm) in diameter and 24 inches (610 mm) in depth, unless otherwise approved. The pit shall be accessible and located such that all drainage flows into the pit by gravity. The ejector pit shall be constructed of tile, concrete, steel, plastic or other approved materials. The pit bottom shall be solid and provide permanent support for the pump. The ejector pit shall be fitted with a gas-tight removable cover that is installed flush with grade or floor level, or above grade or floor level. The cover shall be adequate to support anticipated loads in the area of use. The ejector pit shall be vented in accordance with Chapter 9.
712.3.3 Discharge pipe and fittings.
Discharge pipe and fittings serving ejectors shall be constructed of materials in accordance with Sections 712.3.3.1 and 712.3.3.2 and shall be approved.
712.3.3.1 Materials.
712.3.3.2 Ratings.
Pipe and fittings shall be rated for the maximum system operating pressure and temperature. Pipe fitting materials shall be compatible with the pipe material. Where pipe and fittings are buried in the earth, they shall be suitable for burial.
712.3.4 Maximum effluent level.
The effluent level control shall be adjusted and maintained to at all times prevent the effluent from rising to within 2 inches (51 mm) of the invert of the gravity drain inlet into the sump.
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