angle to lower the pressure (lower flow) or decrease the blade angle to
increase pressure (increase flow).
(8) After the pressure has been adjusted to a value pre-selected (within
3 psi), conduct a flight test to determine the actual flow rate performance
that exists. This is accomplished by spraying water from the system at
those given conditions for a period of several minutes. The flow rate is
established by dividing the amount of liquid spayed by the time recorded
for spraying. For example if 120 gallons is sprayed in 2 minutes, the
flow rate would be 60-gallons per minute, the desired amount previously
established in Step (4).
(9) If the measured flow is too low, decrease the windmill blade angle.
Similarly if the measured flow is high, increase the blade angle.
Final adjustments can be made after the first chemical spray
operations by the same procedures outlined in Steps (8) and (9).
An alternate adjustment is to remove or add a number of nozzles to
correspond to the requirements to meet the flow.
Add nozzles to
increase flow and remove nozzles to decrease flow.