Flowserve 80 Series Five Star Seal - Manual (Page 9)

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3.3 For dual seal un-pressurized operation, supply a clean compat-
ible buffer fluid to the inlet port at a pressure below the stuffing box
pressure. See Figure 9. Consult Flowserve, Flow Solutions for
assistance. Flowserve can supply information on buffer fluid flow
equirements based on seal size, product temperature, barrier fluid
characteristics, and shaft speed.
3.4 The Flowserve Supply Tank is designed to work with the 86/87
seal to form a self-contained sealing system, ask for Flowserve
Publication FSD121. The circulating feature in the 86/87 seal
provides a positive 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 gener-
ated heat. Ask for Flowserve Publication FTA128 for system limits.
Cooling coils are available with the Supply Tank to increase heat
dissipation. The Supply Tank can be used with the 86/87 seal in
both the dual pressurized or dual unpressurized operating modes.
Dual 86/87 Pressurized with Supply tank
Figure 8
1.2 m (4 feet )
maximum
30 cm
(1 foot )
minimum
Supply Tank
Assembly with
Cooling Coils
Pressure
Source