Flowserve ISC2 Series - Manual (Page 15)

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Plan 13: default inner seal flush and vent from pump suction on
vertical pumps (single seals)
Plan 21: inner seal flush from pump discharge through a cooler
for use with hot products (single seals)
Plan 23: inner seal flush from internal pumping device through
cooler (ISC2-XP and ISC2-XB designs)
Plan 32: inner seal clean external flush for use with abrasive
products or products that are incompatible with the seal
(single seals)
Plan 52: dual seal circulation through a low pressure reservoir
(dual seals)
Plan 53: dual seal circulation through a pressurized reservoir
(53A), finned tube array (53B) or piston accumulator
(53C) (dual seals)
Plan 62: external quench on atmospheric side of seal (single
seals)
7.2 For dual seals, LBI (Liquid Barrier Inlet) and LBO (Liquid
Barrier Outlet) are marked on the gland. ISC2 seals are unidirec-
tional and piping the correct inlet and outlet is important to proper
circulation. The liquid barrier inlet should draw from the bottom of
the support system while the liquid barrier outlet feeds the top of
the system.
Forced ventilation of the seal chamber must be ensured when the
circulation pipe is connected. Should there be gas or air pockets
in the sealing chamber, these can accumulate with the rotation
at the outer diameter of the seal gap at machine start-up. This