Pump operation precautions – Goulds Pumps 3298 - IOM User Manual
Page 52
Commissioning, Startup, Operation, and Shutdown
Group
Pump size 60 Hertz
50 Hertz
GPM
m3/hr
3600
1800
1200
3000
1500
1000
S
1 x 1½ - 6
5
3
2
2
1
0.5
2 x 3 - 6
30
15
8
6
3
1
V3298
S
1½ x 2 - 6
5
3
2
2
1
0.5
1½ 2 - 8
60
30
20
11
7
4
2 x 3 - 6
60
30
20
11
7
4
M
1½ x 2 - 10
30
5
3
5
0.7
0.5
1.
All flows are for a continuous operation of 24 hours a day, seven days a week.
2.
These values are based on water with a specific gravity of 1.0 and specific heat of 1.0.
3.
You can reliably operate the pumps at lower minimum flows under intermittent operating conditions
(less than 15% of the time). Contact ITT for more information.
4.
Contact the factory for pump efficiency at minimum flows.
5.
You can operate the pump at substantially lower flows with an adequate NPSH margin. Contact ITT
for details.
Pump operation precautions
General considerations
WARNING:
• Never operate the pump below the minimum rated flow, when dry, or without prime.
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.
• 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.
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.
50
3298 Family Installation, Operation, and Maintenance Manual