GROUNDWORKS
Groundworks for private pumping stations
When gravity drainage from a property is not possible, a pumping station is usually required to pump wastewater and sewage to the public sewer. David Johnson of Pump Technology explores the correct specifications for pumping stations
or single or multiple dwellings that are not going to be adopted by a water company, a private sewage pumping station can be used. Selecting the right size pumping station, chamber sizes and pump/s are critical for the future reliability and long life of the station. Because of this, it is good practice to seek advice from a pump expert.
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The chamber should be sized to provide 24-hour storage for the property. This calculation is based on 120 litres per person, per day. The pump is sized based on the differential head and friction losses to the discharge point. Additionally, the internal pipe diameter, and the number of bends and distances also needs to be taken into consideration.
The location for any pumping station and its associated groundworks needs careful planning to account for pipe runs, on-going access routes to discharge points, service access and traffic flow (vehicle or pedestrian) over any covers which are fitted.
The best pump station manufacturers and suppliers offer stations with a wide variety of tank sizes and pump options to allow the exact matching of the pumping performance to the application. Tanks can range from relatively small (e.g. for a single dwelling) to much larger (e.g. for multi property developments). Ideally tanks should be supplied with customisable invert and discharge options to ensure that groundwork needs can be met. Pump options range from those fitted with shrouded impellers for wastewater, rainwater or final effluent applications, to systems with free-flow vortex impellers or a cutter/impeller design for sewage pumping. The latter type is suitable for high head applications, or for small-bore piping, nominally 50 mm diameter.
ADF MARCH 2020
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In addition to the pump performance matching the required lift, the flow should be capable of generating a velocity through the pipe of a minimum 2.5 litres per second. This ensures debris does not attach itself to the side of the pipe, and therefore blockages are avoided.
If the whole property or properties are relying on the pump station, then the
The location for any pumping station and its associated groundworks needs careful planning
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