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Standby Pump Operation

There are two identical pumps in a typical BFS Duplex pump system. Each pump is designed to handle 100% of the load. The pump designated to supply the process is considered the active pump. The other pump is a standby pump.

It is good practice to run the standby pump on a regular basis, to ensure that it is in good condition. One way to do this is to alternate the active and the standby pump. With a manual Duplex Transfer Switch in the control panel, an operator can easily choose the active pump when desired. With an Electric Pump Alternator in the control panel, the pumps alternate automatically.

Upon failure of the active pump, these methods still require an operator to start the standby pump. By adding a Lead/Lag function to the control panel, the standby (Lag) pump is started automatically when the active (Lead) pump fails. A sensing device, such as a pressure or flow switch, is required to detect the Lead pump failure.

In a typical BFS Triplex pump system, there are two active pumps and one standby pump. With the standby pump located in the middle, its discharge can be easily piped to the other two. This allows the standby pump to replace either active pump, but not both at the same time. Using the standby pump requires the operator to open the appropriate discharge valve and set the manual Triplex Transfer Switch on the control panel. The left position of the switch replaces the left pump, the right position replaces the right pump, and the middle position replaces neither (standby).