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6. INSTALLATION
Before installing the system, inspect all components for damage. If any of the com-
ponents are damaged, you should report this to your local Flowserve representative.
Position the NX seal cooler as close to the seal as possible. Make sure there is suf-
ficient room for:
• Evacuation of the Plant in case of an emergency (do not block walkways
and emergency exits).
• Safe operation and maintenance of the system.
WARNING
CRUSH HAZARD. Possible injury and/or trapped limbs. Take care to
avoid being trapped or crushed between heavy, moving objects.
6.1 Primary API Piping Plans
API Plan 21 provides cooling to the seal by flowing pump discharge fluid through a
control orifice and into the seal cooler before entering the seal chamber. This piping
plan is targeted for clean high temperature fluids and hot water above 176°F (80°C)
to improve vapor margins, meet secondary seal element temperature limits, reduce
coking, and improve fluid lubricity.
API Plan 23 cools the seal chamber fluid by using a pumping device to circulate the
seal chamber fluid through a seal cooler and back to the seal chamber. The circulated
fluid is isolated from the pump impeller area by a throat bushing so that the seal
cooler needs to cool only a small volume of fluid in the seal chamber heated by the
seal faces and heat soak from the process side. This piping arrangement is the plan
of choice for clean hot water services, particularly above 176°F (80°C) where water
has low lubricity, and many clean hot hydrocarbons to improve vapor margins.
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