Flowserve ISC2 Series - Manual (Page 19)

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8.7 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 running. Process fluid must be in the seal chamber
at all times during single seal running. Do not exceed the recom-
mended maximum pressure and speed limits shown in the ISC2
brochure.
At all running temperatures the product must not come within 20
K of its evaporating point. Should this not be the case during cer-
tain situations (e.g. machine shutdown, start-up) forced circula-
tion or adequate cooling of the supply fluid must be generated to
promote heat removal.
Escaping leakage must not form an explosive mixture.
9. Shut down, disassembly
The equipment can be shut down at any time. Before the mechani-
cal seal can be removed the equipment must be de-pressurized and
drained. Barrier pressure (if applicable) must be relieved after the
equipment has been de-pressurized.
Operator must persuade himself before starting disassembling of
mechanical seal that the external of the equipment is cool enough
to be handled without risk.
Product may be released during removal of the mechanical seal. Safety
measures and protective clothing may be required as per the plant’s
safety regulations.