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.
Reduce coking.
Advantages: Has greater
cooling efficiency than
Plan 21 because it
continuously recirculates
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.