Pump stations are used in especially important processes when liquid supply should not be interrupted or the main pump must be supported by instantly available back-up pumps, as well as in highly variable supply schedule systems.
Generally, pump stations provide the option to enable a standby mode for one of the standby pumps. The control system sends a signal to start a back-up pump if the main pump cannot perform its functions fully or there is a need in a capacity increase. Pump stations can be designed as series of pumps installed one after another to increase the station’s overall head.
Pumping liquids in the context of varying inlet flows requires pump stations with cascade or rpm regulation and process control, for example, to maintain pressure in variable flow networks. In doing so, the system either switches the pumps or changes the Q-H characteristics by regulating the shaft rpm of the pump.
PUMP STATION HYDRAULIC DIAGRAM:
1 - Storage tank
2 - Butterfly valve
3 - Pump
4 - Check valve
5 - Butterfly valve
6 - Pressure gauge
7 - Ball valve
8 - Accumulator
9 - Turbine flowmeter
10 - Butterfly valve with electric motor
11 - Diaphragm