Flowserve ISC - Manual (Page 10)

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ISC Innovative Standard Cartridge Seal - Installation Instructions for Machinery Components
Shaft rotation from exposed end of gland
Inlet Outlet
Clockwise (CW) Port b Port a
Counterclockwise (CCW) Port a Port b
8.2 For running a dual pressurized seal (double
seal), supply a clean compatible barrier fluid
to the inlet port at a pressure at least 5 psi
(170 kPa) 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.
Monitoring the liquid circulation is a recommended measure for ensuring that the
mechanical seal runs properly.
Suitable measures must be implemented to prevent errors in the handling of shut-off
and throttling devices installed in the fluid supply.
8.3 For running a dual nonpressurized seal (tandem seal), supply a clean compatible buffer
fluid to the inlet port at a pressure below the seal chamber pressure (See Figure 10).
Figure 8
The pressure in the seal chamber must not exceed the recommended maximum pres-
sure. Flowserve can supply information on buffer fluid flow requirements based on
seal size, product temperature, buffer fluid characteristics, and shaft speed.
8.4 The Flowserve Supply Tank is designed to work with the ISC Dual Seal to form a self-
contained sealing system. The new circulating feature in the ISC 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 genera-
ted heat. Cooling coils are available with the Supply Tank to increase heat dissipation.
The Supply Tank can be used with the ISC Dual Seal in both the double or tandem
operating modes.
Recommendation: For enhanced seal performance and reduced coking, use Dura-
Clear as a barrier fluid. Refer to DuraClear brochure FSD1 or contact a Flowserve
seal application engineer for further details.
9. Functional Recommendations
9.1 Do not exceed corrosion limits. The ISC is designed to resist corrosion by most
chemicals. However, do not expose the ISC materials of construction to products
outside of their corrosion limits. The ISC assembly drawing lists the materials of
construction.
Figure 9.
Double ISC
with Supply Tank
Figure 10.
Tandem ISC
with Supply Tank