Description

Product recirculation from pump discharge to seal chamber through a flow control orifice and seal chamber back to suction through another flow control orifice.

Features

  1. Ensures product recirculation as well as venting.
  2. Increase cooling of seal chamber.
  3. Combination of plan 11 and plan 13.

Use

  1. Used in vertical pumps.
  2. Used in light hydrocarbon services.

Caution

  1. Check for pressure margin between discharge to seal chamber pressure and seal chamber to suction pressure.
  2. A distributed flush injection is not recommended with a piping plan 14.