Flowserve 682 Seal Cooler - Manual (Page 4)

4
Standard Model Numbers:
• Series Tube Flow:
A2R21431-01 (Base) / A2R21431-06
• Parallel Tube Flow: A2R23812-01 (Base) / A2R23812-06
1 Installation
1.1 Primary Piping Plans
Plan 21 - Seal Flush Plan 21 provides cooling to the seal with high flush
flow rate capabilities by recirculating pump discharge fluid
through a flow control orifice and a seal cooler before it enters
the seal chamber. Because the circulated fluid returns to the
pump suction and must be re-pumped to discharge on each
pass, the seal cooler is typically piped for Series or Multiple
Pass Tube Flow to maximize heat transfer capability for
continually removing both process fluid and seal generated
heat. This piping plan is targeted for clean high temperature
fluids and hot water under 80°C (176°F) to improve vapor
margins, meet secondary seal element temperature limits,
reduce coking and polymerizing, and/or improve fluid lubricity.
Plan 23 - Seal Flush Plan 23 cools the seal chamber fluid by using a
pumping device to circulate the seal chamber fluid out through
a seal cooler and back to the seal chamber. With the need to
minimize head loss or pressure drop through this recirculation
system, the seal cooler is typically piped for Parallel or Single
Pass Tube Flow. The circulated fluid is isolated from the pump
impeller area by a throat bushing so that the seal cooler
needs to cool only the seal chamber fluid heated by seal
generated heat and heat soak from the process side.
This piping arrangement is the plan of choice for clean hot
water services, particularly above 80°C (176°F) where water
has low lubricity, and many clean hot hydrocarbons to improve
vapor margins.