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682-53B System
4.5 Theory of operation (typical system)
NOTE: The numbers in the following description refer
to the numbers used in the standard and optional parts
tables shown in paragraph 4.4.
• A non-toxic barrier fluid is supplied to the cavity
between the inner seal and outer seal of a dual
pressurized seal. A bladder accumulator (1) ensures
that the pressure of this barrier fluid is at least 1.4
barg (20 psi) [depending on the seal type] higher than
the seal chamber pressure. This prevents pumping
product leaking through the mechanical seal into the
atmosphere.
• The accumulator is equipped with an elastomer
bladder. This bladder is filled with N
energy, to keep the barrier fluid pressurized.
• The barrier fluid is captured in a closed loop. An integral
pumping device circulates the barrier fluid through the
closed loop. The barrier fluid lubricates the inner and
outer seal. If the circulating flow is too low, an external
circulation device (e.g., circulation pump) shall be used
instead. The circulated barrier fluid passes through a
cooler (2), to lower the temperature.
4.7 682-53B product offerings
SSIOM000742-00 (EN/AQ) November 2022
. The N
stores
2
2
4.6 Identifying the product (nameplate)
• As a part of system design, a calculated amount of
barrier fluid is allowed to leak into the sealed fluid.
This ensures that the sealed fluid can never enter
the atmosphere. Due to the leakage over the seal,
the pressure in the closed loop will drop slightly, but
will automatically be compensated by the stored N
pressure in the accumulator. A pressure transmitter (3)
indicates when the barrier fluid is below the minimum
pressure. The barrier fluid must then be refilled to the
maximum pressure as specified in the GA drawing(s)
in the appendix. The N
2
checked once a year as a part of periodic maintenance.
NOTE: The system must be fitted with a pressure
transmitter that will generate an alarm when the barrier fluid
reaches the minimum pressure.
The nameplate is, as per Flowserve standard, shown in the
GA drawing.
This nameplate provides the necessary information
regarding the system.
For information on the nameplate, see the attachments in
"Chapter 12 Appendix".
pressure in the accumulator is
Flowserve.com 12
2
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