6
5 Operational Recommendations
See Figure 8 for a suggested sealing fluid supply system for Dual Pressurized Seal designs.
For other systems using Supply Tanks or Circulators refer to the tank or circulator instructions
or contact Flowserve.
5.1 The Dual Pressurized Seal requires a constant supply of a clean barrier fluid. Whenever the
equipment is in operation circulate clean barrier fluid from a reliable external source between
the seals in the seal chamber. Always start up the barrier fluid supply system before starting
the equipment. Maintain the fluid pressure between the seals at least 103 kPa (15 psig) greater
than the maximum pressure of the pumped product acting on the inner seal. Figure 8 shows
Plan 53 with a pressurized supply tank and Plan 54 with an external support system.
Do not exceed the pressure-velocity (P-V) limits of the seal, see the pressure-velocity curves
for this seal.
5.2 Do not start up the equipment dry. Vent air from the casing of the pump and the seal chamber
before startup.
5.3 If the seal runs hot or squeals, check the seal housing dimensions to ensure that the seal is not
over-compressed and inspect the barrier fluid supply system. Do not allow the equipment to
run for any extended time if the seal gets hot or squeals.
For special problems encountered during installation, contact your nearest Flowserve Representative
or Authorized Distributor.
The images of parts shown in these instructions may differ visually from the actual
parts due to manufacturing processes that do not affect the part function or quality.
6 Repair
This product is a precision sealing device. The design and dimension tolerances are critical to seal
performance. Only parts supplied by Flowserve should be used to repair a seal. To order replacement
parts, refer to the part code and B/M number. A spare backup seal should be stocked to reduce repair
time.
When seals are returned to Flowserve for repair, decontaminate the seal assembly and include an
order marked "Repair or Replace." A signed certificate of decontamination must be attached.
A Safety Data Sheet (SDS) must be enclosed for any product that came in contact with the seal.
The seal assembly will be inspected and, if repairable, it will be rebuilt, tested, and returned.
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