Description: Plan 54 is an external system supplying clean
BARRIER fluid to an Arrangement 3 dual seal at greater pressure
than the process pressure being sealed. Pressure and circulation
are provided for by an external pump or pressure system.
Objective: Same as Plan 53A and will provide constant pressure
and flow through circulation system.
Advantages: Same as Plan 53A but provides excellent circulation
and cooling. Can be used on multiple seals to reduce cost. The
barrier fluid enters the seal and exits in a once in and once out
Plan 55 is similar to Plan 54 except the
system is supplying clean BUFFER fluid at
less pressure than the process pressure
being sealed, to an Arrangement 2 dual
seal. No process contamination and
improved cooling over Plan 52.