Goulds Pumps 3393 - IOM - Manual (Page 47)

Commissioning, Startup, Operation, and Shutdown
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.
NOTICE:
• Make sure the oil level has remained steady by checking the oiler.
• Check the bearing temperatures using a pyrometer or other temperature-measuring
device. Monitor the bearing temperature frequently during initial operation in order to
determine if a bearing problem exists, as well as to establish normal bearing operating
temperature.
• For pumps with auxiliary piping, make sure that proper flows have been established and
that the equipment is operating properly.
• Establish baseline vibration readings in order to determine normal running conditions. If
the unit is running roughly, then consult the factory.
• Monitor all gauges to ensure that the pump is running at or near rating and that the suction
screen (when used) is not clogged.
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. If pump becomes plugged shut
down and unplug prior to restarting pump.
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:
Model 3393 Installation, Operation, and Maintenance Manual 45