Bell & Gossett P2000452 Series 580 - Manual (Page 18)

Pump operation precautions
General considerations
CAUTION:
• Vary the capacity with the regulating valve in the discharge line. Never throttle the flow from the
suction side since this can result in decreased performance, unexpected heat generation, and
equipment damage.
• Do not overload the driver. Driver overload can result in unexpected heat generation and equipment
damage. The driver can overload in these circumstances:
• The specific gravity of the pumped fluid is greater than expected.
• The pumped fluid exceeds the rated flow rate.
• Make sure to operate the pump at or near the rated conditions. Failure to do so can result in pump
damage from cavitation or recirculation.
Operation at reduced capacity
WARNING:
Never operate any pumping system with a blocked suction and discharge. Operation, even for a brief
period under these conditions, can cause confined pumped fluid to overheat, which results in a violent
explosion. You must take all necessary measures to avoid this condition.
CAUTION:
• Avoid excessive vibration levels. Excessive vibration levels can damage the bearings, stuffing box or
seal chamber, and the mechanical seal, which can result in decreased performance.
• Avoid increased radial load. Failure to do so can cause stress on the shaft and bearings.
• Avoid heat build-up. Failure to do so can cause rotating parts to score or seize.
• Avoid cavitation. Failure to do so can cause damage to the internal surfaces of the pump.
Operation under freezing conditions
NOTICE :
Do not expose an idle pump to freezing conditions. Drain all liquid that is inside the pump and the flush
lines. Failure to do so can cause liquid to freeze and damage the pump.
Shut down the pump
1. Slowly close the discharge valve.
2. Shut down and lock the driver to prevent accidental rotation.
Commissioning, Startup, Operation, and Shutdown
16 Series 580 Installation, Operation, and Maintenance Manual