Flowserve ISC Series - Manual (Page 12)

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4.2 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 9.
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.
4.3 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 10. 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 characteristics,
and shaft speed.
Double ISC with Supply Tank Figure 9
Bypass
Flush to
Gland
Flush Port
Supply Tank
Assembly with
Cooling Coils
1.2 m (4 feet)
maximum
Pressure
Source
0.45 - 0.6 m
(1.5 - 2 feet)
minimum
Orifice
Option