Installation and Operation Manual
SA-07-11-87, Rev A
11
January 2019
Seal Environmental Control System
A seal environmental control system may be
required depending upon the pump seal
arrangement and application.
Always maintain the pump seal environment as
detailed on the specification sheet that
accompanies each unit.
Note: For most applications, a standard
control system can be obtained from
the factory.
Ensure that the specified seal environmental
control system is properly installed and that the
ports are open (or plugged) as indicated in the
final data package.
Note: Seal Drain (“D”) must always be open
so that it is free to drain.
Depending on the seal plan, the seal ports will be marked accordingly with an engraved reference. Port
Designations are as follows:
D
-Drain
Q
-Quench
V-
Vent
BI-
Buffer In
FI
-Flush In
BO
-Buffer Out
FO
-Flush Out
Connections are made in accordance to the specified seal plan and Port Location follows Table 2 in API
682.
Note: Port nomenclature may vary from API designations and seal manufacturers. Refer to the unit
seal drawing for connection designation.
Cryogenic Applications
The 803Lr, when configured for cold services,
can operate with process temperatures to -200
°F (-123°C). These applications require the use
of a bearing box and heat trace around the
cartridge seal. Heat trace is necessary to
prevent ice buildup on the seal and impacting
the seal gland and rotating collar. The amount
of trace required is just enough energy to keep
the seal above freezing while not warming any
of the process. The control for the heat trace
system can be mounted to the unit with a
bracket or off the unit in a convenient location.
.
Liquid Buffer System
For double liquid seals and tandem liquid seals,
a liquid buffer system is used. Introduce the
buffer liquid into port 7 on a mechanical seal or
BI on a cartridge seal, which will flow through
the seal cavity, and out from port 2 or BO.
Buffer flow should be 0.5 to 3 gpm (2 to 12
liters/min) with an inlet temperature of 60
o
to
120
o
F (16
o
to 49
o
C), and inlet pressure as
indicated on the pump specification sheet. The
liquid must be clean to 5
µ
microns.
