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Sewage Pump Stations

A sewage system is made up of a network of pipes that carry sewage from homes and businesses to the main sewers. In a perfect world, the pipes rely on gravity for the waste to flow into the main sewer but, in low-lying areas where the main sewer sits on higher ground than the domestic sewage pipes, the sewage needs to be transported to the main sewer in a different way. This is where sewage pumping stations come into use.

What is a sewage pumping station and how does it work?

A pumping station is made up of a large tank, known as a wet well, that acts as the receiver for sewage from a building or a group of buildings. Sewage from individual houses also flows into the wet well.

The sewage will then sit in the well until it reaches a predetermined level. Once it reaches this level, a pump will kick in to pressurise the sewage so that it will travel out of the wet well and uphill, to a point where it enters the main sewer where it can then travel into the main sewer using gravity.

Our Systems cover all options

The Allsebrook range incorporates systems for pumping surface water or domestic sewage to mains, septic/PSTP effluent to drainage fields/watercourses, and bespoke systems for larger domestic and industrial applications.

Operating principle

Each pump chamber contains a number of float switches linked to a control panel that automatically controls flow and levels. In a single pump chamber there are three float switches:

Float A: Actuates the pump cycle until level drops to low level.

Float B: Low level float stops the pump.

Float C: High level alarm – positioned above the pump actuator float (min 100mm).

For twin pump chamber operation there is an additional float switch (Float D) – usually positioned 150mm above first actuator (A) – which actuates the second pump in periods of higher flow. After each cycle the pumps alternate to extend pump life and are designed to run for a minimum of 60 seconds with no more than 15 starts per hour.

Pump chambers

  1. Inlet
  2. Submersible pump
  3. Pump guide rails/pedestal
  4. Pump retrieval chains
  5. Non-return valve
  6. Isolation valve
  7. Outlet
  8. Access cover


Can be supplied as single or twin pump system.

Maintaining a healthy pumping station

Regular maintenance of pumping systems is essential, particularly where the pump is part of a sewage treatment system. The point of maintenance is to avoid breakdowns of these critical systems via regular servicing and the replacement of any parts that are worn or no longer fit for purpose.

A well-maintained pumping system should last longer than a poorly maintained one and therefore the maintenance will be cost-effective in the long term.