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Submersible Pumps Overview

Ejector pumps are required in applications where wastewater cannot flow by means of gravity at a velocity rate greater than 2' (0.6 m) per second.

Design Styles:

  • Vertical suspended type - Motor is exposed outside of basin, supported on the cover with an extended motor shaft connected to the pump housing and impeller, which are located inside the basin.
  • Close coupled submersibles - Motor is connected directly to the pump housing and impeller with a short shaft and no part of the pump is exposed outside of the basin.

These styles are available with either an explosion-proof or non-explosion-proof motor. Often, an explosion-proof motor is not practical, but sometimes required by code.

Characteristics:

Solids-handling pump
Ability to pump high flow
Solids-handling capacity from 2" through 4" (51 -102 mm)
Lower-head residential to municipal lift stations
Pumping everything from sanitary sewage to rainwater to a gravity sewer system
Typical flow rates: 80 - 4,000 GPM (18 - 908 m3/hr)

Grinder pump
Pumps low flow against high head
Grinds solids instead of passing them
Residential or commercial locations
Often pumping to a pressure sewer system but also used in gravity sewers if high vertical lifts or long horizontal runs are present in system
Typical flow rate: 10 - 200 GPM (2 - 45 m3/hr)

Effluent Pump
Pump used to move septic tank effluent
High head, low flow pumping performance
1/2" - 3/4" (13 - 19 mm) solids capacity
Used in septic tank systems to move effluent from the dosing chamber to either an onsite treatment system or pressure sewer
Typical flow rate: 10 - 50 GPM (2 - 11 m3/hr)

Sump pump
Used for moving groundwater away from building foundations
Low flow against low head
Minimal solids capacity
Typical flow rate: 10 to 250 GPM (2 - 57 m3/hr)

 

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