![]() One design uses an open recessed impeller, no wear rings and clearance dimensions that allow 2-inch (50-mm) diameter spheres to pass through. Such a pump may be suitable for subsoil drainage or for greywater pumping.įor drainage flows from water closets and similar fixtures, manufacturers provide pumps of two designs. For minimal contaminants, the design may be with an enclosed impeller, wear rings and clearance dimensions that allow 3/4-inch (19-mm) diameter spheres to pass through. The nature of solids and other contaminants in the water handled by drainage pumps necessitates several types of pump designs. In any design, provision is required for air to enter or leave the basin as the water level varies. Some pumps are designed to be submerged in the inlet basin and others in a dry pit adjacent to the basin in others, the motor is mounted above with only the pump casing and impeller submerged. The terminology varies to describe these pumps, but typical names include sewage pump, sump pump, sewage ejector, lift station pump, effluent pump, bilge pump, nonclog pump, drain water pump, solids-handling sewage pump, grinder pump, dewatering pump and wastewater pump.ĭrainage pumps generally have vertical shafts, cylindrical basins and indoor or outdoor locations. Lastly, if backflow is intolerable from floor drains in a high-value occupancy, pumps are provided for the floor drains. Elevation issues usually apply to subsoil drainage, so this water also is pumped. The issue may apply only to one fixture, one floor or the entire building. ![]() ![]() Where the elevation of the municipal or building sewer is insufficient or if another elevation shortfall occurs, drainage pumps are added to a drainage system. ![]()
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