Vortexing

Vortexing is caused by insufficient surface tension on the liquid

Symptoms

1. Pump makes a growling sound

2. Whirlpool usually visible on liquid surface

3. Loss of Flow

Causes

1. There is not enough liquid height above the suction line entrance

2. The velocity at the suction line entrance is too high

Remedy

Decrease liquid velocity and/or increase submergence in accordance with the following table

Submergence can be increased by resetting the pump shutoff   level higher in the sump or tank.

Velocity can be decreased by enlarging the suction bottom opening by installing a suction bell.