Network pumping stations
With network or medium-sized pumping stations, a distinction is made between dry and submerged pump installations.
Pumping stations in which the pumps are submerged in the sewage are by far the most common as they are less expensive and require less space. However, the disadvantage is when the valves in the pumping station need servicing because it is necessary to access the pumping station. This can be avoided by installing a separate valve chamber. This makes it possible to service the valves without first having to enter a confined space, thus also avoiding all the related health and safety requirements.
Pumping stations in a dry environment offer the same advantages regarding health and safety issues. Moreover, none of the installation accessories, pumps or valves which are found in wet or submerged installations are needed in a dry installation. Furthermore, it is possible to place the controller at a distance from the usual earth cabinet installation and thereby greatly minimise the risk of vandalism. To make a dry installation, install two prefabricated pumps next to each other: One is used as a collecting tank or sump, while the other is used to house the equipment. The sewage from the collecting tank is led directly into the pumps and pumped to the next manhole, network pumping station or main pumping station.
Most network pumping stations are equipped with two pumps: Each pump is dimensioned to cope with peak volumes of wastewater and rainwater and are operated alternately to ensure the same number of operating hours. It is becoming increasingly common to operate the pumps via frequency drives to save energy.