Description: Plan 01 is an
integral recirculation from
the pump discharge to the
seal chamber. This is an internal version of Plan
11. Recommended for clean process only.
Advantages: No exposed
plumbing around pump.
Reduces risk of freezing or
polymerization of process.
Not recommended for
Description: Plan 11 is recirculation from pump discharge
through an 1/8” minimumflow control orifice (when necessary),
to the seal and back into the process through the pump seal
Objective: Dissipate seal generated heat, vent the seal chamber
at start‐up and increase the vapor margin in the seal chamber.
Advantages: When used with a close‐clearance throat bushing,
will raise the pressure in the seal chamber to maintain the
process in the liquid state when cooling is not
practical. Best for a clean, non‐polymerizing process.