Flowserve P-200 Durametallic - Manual (Page 8)

3.3 For dual pressurized seal (double seal) operation, supply a clean
compatible barrier fluid to the inlet port at a pressure at least
170 kPa (25 psi) above the seal chamber pressure. See Figure 5.
The pressure of the barrier fluid must not exceed the recommended
maximum pressure. Flowserve can supply information on barrier
fluid flow requirements based on seal size, product temperature,
barrier fluid characteristics, and shaft speed.
3.4 For dual unpressurized (tandem seal) operation, supply a clean
compatible buffer fluid to the inlet port at a pressure below the seal
chamber pressure. See Figure 6. The pressure in the seal
chamber must not exceed the recommended maximum pressure.
Flowserve can supply information on buffer fluid flow requirements
based on seal size, product temperature, buffer fluid characteris-
tics, and shaft speed.
3.5 The Flowserve supply tank is designed to work with the P-200
seal to form a self-contained sealing system. The circulating
feature in the P-200 provides a positive buffer/barrier fluid flow
from the seal cavity to the supply tank and back to the seal.
In most cases the natural cooling of the piping and tank are
adequate to remove seal-generated heat. Cooling coils are
available with the supply tank to extend operating limits.
The supply tank can be used with the P-200 seal in the dual
pressurized, Figure 5, or dual unpressurized, Figure 6,
operating modes.
Recommendation: For enhanced seal performance and reduced
coking, use DuraClear as a barrier fluid. Refer to DuraClear brochure
FSD123 or contact a Flowserve seal application engineer for further
details.
3.6 Good piping practices:
• minimize line losses
• use large diameter tubing
• only upward sloping lines
• use long radius bends
• minimize component losses
• optimize for thermosyphon
• check rotation direction
• test for leaks
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