Flowserve ISC2 Series - Manual (Page 17)

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Suitable measures must be implemented to prevent errors in the
handling of shut-off and throttling devices installed in the fluid
supply.
7. For dual unpressurized (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.
7.5 Quench and Drain ports on single seals should be plugged if
not used as a good housekeeping practice. Note: the quench and
drain ports are smaller than the flush port as a distinguishing fea-
ture.
Escaping leakage must not form an explosive mixture.
7.6 Dual seal recommendation: For enhanced seal performance
and reduced coking, use DuraClear as a barrier fluid. Refer to
DuraClear brochure FSD123 or contact a Flowserve representative
for further details.
8. Functional recommendations
8.1 Remove lock outs on equipment and valves.
8.2 Do not start up the pump dry 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.
It must be ensured that the machine is protected against penetra-
tion by dust and / or that dust deposits are removed at regular