Flowserve Dual Pressurized Seals - Manual (Page 7)

7
5 Operational Recommendations
See Figure 4 for a suggested sealing fluid supply system for Dual Pressurized Seal
designs. For other systems using Supply Tanks or Circulators refer to the tank or circulator
instructions or contact Flowserve.
5.1
The Dual Pressurized Seal requires a constant supply of a clean barrier fluid.
Whenever the equipment is in operation circulate clean barrier fluid from a
reliable external source between the seals in the seal chamber. Always start up
the barrier fluid supply system before starting the equipment. Maintain the fluid
pressure between the seals at least 103 kPa (15 psig) greater than the maximum
pressure of the pumped product acting on the inner seal. Figure 4 shows Plan 53
with a pressurized supply tank and Plan 54 with an external support system.
Do not exceed the pressure-velocity (P-V) limits of the seal, see the pressure-
velocity curves for this seal.
5.2 Do not start up the equipment dry. Vent air from the casing of the pump and the
seal chamber before startup.
5.3 If the seal runs hot or squeals, check the seal housing dimensions to ensure that
the seal is not over-compressed and inspect the barrier fluid supply system. Do not
allow the equipment to run for any extended time if the seal gets hot or squeals.
For special problems encountered during installation, contact your nearest Flowserve
Representative or Authorized Distributor.
Recommended Barrier Supply System for Dual Pressurized Seals
Figure 4
seal
end view
seal
end view
Plan 53A
Plan 54