Flowserve ISC2 Series - Manual (Page 7)

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3.4 For dual unpressurized (Plan 52, tandem seal) operation, supply
a clean, compatible buffer fluid at a pressure below the seal chamber
pressure. The pressure in the seal chamber must not exceed the
recommended maximum pressure.
3.5 For single seal operation excluding Plan 23, ensure all ports are fitted
with piping or plugs. Plans 02 and 03 must close the Flush port with a
metal plug in the same metallurgy as the gland. If Plan 62 is not used, the
Quench port should be plugged. The Drain port should be connected to a
drain line to prevent leakage along the shaft. Note: the Quench and Drain
ports are smaller than the flush port as a distinguishing feature.
3.6 For single seal operation with Plan 23, FI (Flush Inlet) and FO (Flush
Outlet) are marked on the gland. ISC2 seals are unidirectional and piping
the correct inlet and outlet is important to proper circulation. The flush inlet
should draw from the bottom of the cooler while the flush outlet feeds the
top of the cooler. Ensure piping is optimized for thermosyphon flow.
4 Operational Recommendations
4.1 Remove lock outs on equipment and valves.
4.2 Do not start up the pump dry to check motor rotation or for any other
reason. Open valves to flood pump with product fluid. Ensure that the seal
flush or support system is operating. Vent air from the casing of the pump
and the seal chamber before start-up.
4.3 Observe the start-up. If the seal runs hot or squeals, check the seal flush
system. Do not allow the pump to run for any extended time if the seal
gets hot or squeals.
4.4 Do not exceed corrosion limits. The ISC2 seal is designed to resist
corrosion through proper material selection. Do not expose the ISC2
seal materials of construction to products outside of their corrosion limits.
Consult Flowserve for chemical resistance recommendations.
4.5 Do not exceed pressure and speed limits established for the ISC2 seal.
4.6 Do not exceed the temperature limits of the ISC2 seal based on the
materials of construction. For dual seals using supply tanks with cooling
coils, turn on cooling water to the supply tank before start-up.
4.7 Do not start up or run the ISC2 seal dry. The seal chamber, pump and
support systems should be thoroughly vented before start-up. Buffer or
barrier fluid must flood the seal cavity of dual seals at all times during
operation. Process fluid must be in the seal chamber at all times during
single seal operation.