Flowserve CPM Supply Tank - Manual (Page 2)

Introduction
This manual covers the installation and operation of the CPM Seal
Support Reservoir for dual non-pressurized (API Plan 52/ANSI Plan
7352) and dual pressurized seals (API Plan 53/ANSI Plan 7353). The
following instructions describe the appropriate system, buffer/barrier
fluids, installation, start-up, and maintenance.
Reservoir
The standard CPM Seal Support Reservoir is designed in accordance
with ASME Code Section VIII, Division 1. All tanks are welded in accor-
dance with ASME Code Section IX. Tanks include inlet, outlet, vent and
fill along with two mounting lugs as minimum connections.
Sealing System Description
CPM Seal Support Reservoir can be used as reservoirs for dual pressur-
ized Inside, dual pressurized inside/outside or dual non-pressurized
Flowserve Seal designs. The sealing system produced is defined as
being either a thermal convection system or a forced circulation system.
Support System Descriptions
An API Plan 53/ANSI 7353 is a pressurized dual seal system which is
used in services where no process leakage to atmosphere is tolerated.
The system consists of dual mechanical seals with a barrier fluid be-
tween them. The barrier fluid in the supply tank is pressurized to a higher
pressure (normally 25 psig [1.7 bar]) than the seal chamber maximum
160 psig [11 bar]). Primary (inboard) seal leakage will be barrier fluid into
the product. Minimal leakage is customary.
An API Plan 53/ANSI Plan 7353 is usually chosen over an API Plan 52/
ASNI Plan 7352 for dirty, abrasive, or polymerizing products which would
either damage the seal faces or cause problems with the barrier fluid
system if an API Plan 52/ANSI Plan 7352 is used. Two conditions to
consider when incorporating API Plan 52/ANSI Plan 7352; first, there will
always be some leakage of barrier fluid into the product. Normally, this
leakage will be minute, and the leakage rate can be monitored via the
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