Description: Plan 53C utilizes a reference line from the
process in the seal chamber as a pressure source to a
PISTON ACCUMULATOR. Provides a PRESSURIZED system
greater than the process pressure being sealed, providing
clean BARRIER fluid to an Arrangement 3 dual seal.
Circulation provided by an internal pumping ring.
Objective: Same as Plan 53A, but
will handle higher pressures and
maintain a constant differential
pressure above process pressure
on the inner seal.
Advantages: Same as Plan 53B.
Minimizes pressure reversals
and maintains process seal
stability.