Description: Plan 23 is recirculation of process fluid
from the seal chamber, through a seal flush cooler,
back into the seal chamber utilizing a pumping ring.
Objective: Cool process, improving lubricity and
increasing the vapor margin in the seal chamber.
Advantages: Has greater
cooling efficiency than
Plan 21 because it
the seal chamber fluid
through the seal flush
cooler. It decreases
cooler duty, reduces
cooler fouling and
increases cooler life.
Recommendation: Vent tubing before
pump start‐up and use close‐clearance
throat bushing in seal chamber.