Plan 13

Description:
Product recirculation from seal chamber to pump suction though a flow control orifice
Features:
- Provides continuous vent for vertical pumps
For use:
- Whenever Plan 11 is not useable due to low pressure differential between pump discharge and seal chamber pressure
- Used on vertical pumps
Caution:
- Verify differential pressure between seal chamber and pump suction pressure
- Orifice size should be at least 1/8”