MAC/MTT-OPS-1
26 FEB 2019
SECTION 6
Employment
6-2
Adjusting the ring for narrower fan widths will
increase the length of the spray pattern; this may
also increase the closure delay of the spray head.
The “fine spray” setting produces smaller water
droplets ideal for low wind and high humidity
conditions. The following images are examples of
the adjustment ring at the “heavy spray” setting
with varying fan widths.
Heavy Spray (3/8” Slot Height)
The “heavy spray” setting is typically used for
heavy watering and discharging large quantities of
water a short distance from spray head, and is best
suited for higher vehicle speeds and high engine
rpm. When the spray head is set for “heavy spray”,
water pressure is decreased and the reach of the
discharge is reduced.
• The heavy spray setting produces larger water
droplets ideal for high wind and low humidity
conditions.
• When more than 2 spray heads are operated at
the same time, the performance of the spray
system is reduced.
Spray Head Vertical Tilt Adjustment
Swivel joints are an optional feature for spray head
mounting. The joint allows the spray head to be
tilted up or down to suit a given application. In
their default positions, the spray heads discharge
water at an angle of 10° above level. This results in
more uniform droplet formation and subsequent
water coverage. However, in drier climates or high
wind conditions where evaporation is a significant
source of water loss, it may be desirable to adjust
the tilt of the spray heads towards the ground,
thus reducing the amount of water lost to the
effects of wind and low humidity.
To adjust the vertical tilt of spray heads, loosen the
elbow couplings and adjust the swivel elbows (as
shown below) down to the desired angle.
Angling the spray heads down is typically used for
high wind conditions and narrow watering strips.
Spray Head Fan Pattern
Proper employment of the spray system includes
spray head adjustments to best suit the desired
application. ‘Best practices’ are adjustments to the
procedures that address the situation more
accurately. Every application has specific
conditions that must be addressed, such as safety,
wind and weather conditions, terrain, traffic,
traction, and proximity to sensitive equipment and
personnel.
90
o
Fan Width
45
o
Fan Width
20
o
Fan Width
Loosen couplings and rotate elbows to level
water discharge pattern.
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