Flowserve Allpac MP - Manual (Page 3)

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1.8 Handle all seal parts with care, they are manufactured to precise tolerances. The
contacting surfaces of the rotating and stationary seal faces must be treated with
particular care. These two surfaces are lapped flat to within three helium light bands
(34.8 millionths of an inch). Keep the seal faces perfectly clean at all times.
2 Allpac MP Seal Installation
2.1 Lubricate the shaft or sleeve lightly with silicone lubricant before installing any seal
parts.
2.2 Lubricate the two sleeve gaskets before installing them in their grooves in the sleeves.
2.3 Lubricate the flange gasket before installing onto the pilot diameter on the seal
cartridge.
2.4 Back out the drive collar set screws slightly so that no portion of them extends
inward past the sleeve ID.
2.5 Install the complete cartridge seal assembly on the shaft and position it with the
seal oriented toward the pump. If at any time the seal requires a significant amount of
force to position correctly, STOP, BACK UP, and assess the situation.
2.6 Position the cartridge flange against the seal chamber face and tighten the gland
stud nuts evenly in a star pattern. The nuts can be torqued using ordinary wrenching
techniques.
2.7 Adjust the bearings, coupling and pump rotating assembly so that the shaft is in
its operating axial position. Any subsequent axial adjustment of the shaft requires
resetting of the seal.
2.8 Tighten the drive collar set screws to the value specified on the assembly drawing.
Improper installation torque can damage the screws or shaft or result in lower axial
thrust retention of the drive collar.
2.9 Loosen the setting plate fasteners and slide the setting plates away from the drive
collar and sleeve as far as possible. Tighten the setting plate fasteners so that the
setting plates do not come loose during operation.
3 Barrier System Piping
3.1 Each dual cartridge seal has pipe ports labeled as shown in the assembly drawing.
3.2 The Allpac MP seal is designed to be operated with the seal flush and support systems
as defined on the assembly drawing.
4 Operation
4.1 During the first hour of operation, seal performance should be monitored very
closely:
• The temperature rise of the barrier fluid should be steady and should level out
after an hour of operation. A quickly rising temperature or a temperature that does
not seem to be leveling off signals a problem and should be thoroughly investi-
gated.
• A sudden rise or decrease in barrier fluid, or a significant color change of barrier
fluid signals off-design leakage and should be thoroughly investigated.