IPF Rev0204
9
For different size flow tubes the value for K that is used to determine total flow
out of the hydrant will be different than those shown in Table 1. Use the following
formula to determine new value for K.
Total Flow Area
Constant
K
=
Area of Flow Tube Opening
Total Flow Area = Finding the sum of the areas of all open discharges.
(Area of a circle is
π
r
2
)
"K" factor
are used as multipliers to determine total flow out of a hydrant when
the portable flow tester is hooked up to only one port of the hydrant, but water is
flowing out of more than one.
Pump Test
The
Portable Flow Tester
can be used to test pumpers not only from draft but
also from the tank or from a hydrant. It is extremely valuable to know not only that
your pumper can pass the service test, but remember it is necessary to know your
capabilities on the fire ground.
Make sure your pump can supply your preconnected lines with enough water
from the tank, if that is the way you expect to use them. For in-line pump testing,
attach the portable flow tester to the hydrant and run a typical hose layout. Next,
extend your standard fire fighting lines and open them. Monitor the flow.
For the service type of test, connect three lines into a common manifold. On the
discharge of the manifold connect a short length of hose leading into the portable
flow tester. Attach another length of hose on the discharge side and connect this to a
deck gun or monitor. If the monitor incorporates a sufficient straight length, with an
integral stream straightener, then the tester may be attached on to the discharge end of
the monitor in lieu of the nozzle.
Test the pumper according to the certification pressure, RPM, and volume or
pressure pump settings. To do that, set the RPM and then adjust the pump pressure by
adjusting the discharge valves. Correct the RPM if it has changed and readjust the
pressure if that has changed. When you are at the correct pressure and RPM point,
note the flow. The flow should meet the pumper rating at that pressure and RPM.
