Booster Pumps are centrifugal pumps used to increase the pressure of the liquid already flowing from one place to another in a pipeline.
Most booster pumps are centrifugal pumps. Relying upon one or more impellers to draw the pumped fluid through the intake of the pump, the water is then boosted to increase the pressure as it flows through the impeller, then the volute or diffuser casing.
Some are single-stage booster pumps. In other words, they have a single impeller and are generally used in applications where the amount of additional pressure (head) required is not significant.
Multi-stage booster pumps with more than one impeller are used to deliver higher heads. An example of this increased requirement is when water needs to be transferred to substantially higher points within a building, or through much longer pipelines.
A booster pump should never be connected directly to the mains incoming line, but will instead draw water from the “break tank” which is filled under normal mains pressure (1 or 2 bar.
This pump is not designed to hold the pressure of the rising main which increases by 1 bar per floor. It is usually combined with a pressure vessel or hydraulic accumulator.
The pressure vessel consists of an inflatable diaphragm (imagine bladder or inner tube) within a sealed tank which is set to operate at the required system pressure.
Any failure of this bladder will cause the pump to run continuously and will usually result in a loss of performance at higher levels.
For a copy of the ecex leaflet please click Pumps, valves & pipework
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