Goulds Pumps 3640 - 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 operate pump past the maximum flow. For maximum flow refer to the pump performance
curve.
• 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.
• Do not operate pump below hydraulic or thermal minimum flow. For hydraulic minimum flows refer
to technical manual and pump performance curve. To calculate thermal minimum flow, refer to HI
Centrifugal Pumps for Design and Application ANSI/HI 1.3-2000.
• 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:
On ring oil-lubricated pumps, remove oil ring viewing port plugs to verify the following:
• The oil rings are properly positioned in the grooves on the shaft.
• The oil rings are turning.
• The oil rings are throwing oil.
Replace the plugs.
NOTICE:
• On pure or purge-oil mist-lubricated units, remove the viewing port plugs to verify that oil
mist is flowing properly. Replace the plugs.
• 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.
Model 3640 Installation, Operation, and Maintenance Manual 45