What does pressure tank do for VFD inverter pressure booster pump?

There are two reasons why a VFD / VSD Inverter Constant Pressure Booster Pump need to be equipped with a pressure tank. The first one is for water hammer buffering to protect the pump and piping from water hammer damage. The other one is to maintain the system pressure to prevent water pump from short cycling. However, since most of the VFD / VSD Inverter Constant Pressure Booster Pump have soft start and soft stop function, the size of the pressure tank does not need to be big.

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