Plan 13


Product recirculation from seal chamber to pump suction though a flow control orifice


  • 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




  • Verify differential pressure between seal chamber and pump suction pressure
  • Orifice size should be at least 1/8”