Quantcast Flow Rate

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If the pump has flanges, make sure the bolts are all in place and tight.  If it has
isolation flanges, make sure the shutoff valves close easily and check them for
Make sure all pump supports are securely fastened to the building and the pump.
Check for corrosion as well.
Flow Rate
If a pump's loop includes a direct-reading flow meter, use it to determine the loop
flow rate. Compare it to the flow rate called for in the system's operation and
maintenance manual.  If no manual exists, check the flow rate against those listed
in Appendix B.
If the loop includes a flow-setter with ports for measuring pressure, follow the
instructions and charts for that unit to determine flow rate. Compare this to the
system's operation and maintenance manual's listed rate, or check it against
Appendix B if no system manual exists. Inadequate flow rates must be corrected if
they are less than one-half of the design flow rate.
If the loop includes either a pressure gauge on each side of the pump (Figure 3-10),
or a single pressure gauge with small piping and valves (Figure 3-13), determine the
pressure change across the pump while it is running.
As shown in the example which follows, the pump manufacturer's published pump
curve can be used to determine the flow rate. Compare this flow rate to the one
called for in the system's operation and maintenance manual, or check it against
those called for in Appendix B.
Pump With a Pressure
Gauge on Each Side


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