Normally the differential pressure between discharge and suction sides of
Boiler Feed Pumps are quite high. Due to this, the rotor section experiences
very high trust in one direction. The movement of rotor (Axial shift), if it
exceeds manufacturer's tolerances, will result in rubbing of mechanical seals
and damage the same. A Balance Drum is created by interconnecting suction and
discharge sides suitably and the wear out of seals can be inferred by measuring
Balance drum pressure.
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