Commissioning, Startup, Operation, and Shutdown
Model 710 TruBlue Installation, Operation, and Maintenance Manual
43
Limits of operation
Flow limits
These flow limits are valid unless other data is available in the curves or data sheets:
Q
min
= 0.1 x Q
BEP
Short-term operation
Q
min
= 0.3 x Q
BEP
Continuous operation
Q
max
= 1.2 x Q
BEP
Short-term operation as long as NPSH
facility
>
NPSH
pump
+ 1.64 ft (0.50 m)
Permitted number of starts
Do not start the pump more than the number of times shown in this chart:
For pumps that use electric motors, do not start the motor more than the number of times listed
in the motor operation instructions. If two different numbers are shown, the lower number of
starts is the limit.
Pump operation precautions
General considerations
NOTICE:
• Vary the capacity with the regulating valve in the discharge line. Never throttle the flow
from the suction side. This action can result in decreased performance, unexpected heat
generation, and equipment damage.
• Risk of equipment damage from unexpected heat generation. Do not overload the driver.
Ensure that the pump operating conditions are suitable for the driver. The driver can
overload in these circumstances:
• The specific gravity or viscosity of the fluid is greater than expected
• The pumped fluid exceeds the rated flow rate.
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