MAC/MTT-OPS-1
26 FEB 2019
SECTION 6
Employment
6-3
Steps for accurate spray system employment are
as follows:
1. Select spray head fan height to meet road and
watering pattern requirements.
2. Set spray head adjusting ring to the maximum
fan width.
3. Evaluate road conditions for width, grade,
vehicle traffic and optimum travel speed.
4. Locate an isolated section of road to test spray
pattern.
5. Follow Operator’s Manual steps for water
pump activation and spray head operation.
6. Operate water truck and turn all spray heads
ON. Ensure uniform water distribution and
coverage.
7. Apply a test pattern by operating 1 spray head
at a time on road surface traveling at a safe and
average speed until all spray heads have been
cycled. Note engine rpm while discharging
water.
• Water discharge pressure and volume are
dependent on engine rpm. The higher the
engine rpm, the higher the water pressure.
Adjustments to vehicle speed, engine rpm,
and spray head angle may be required.
• Adjusting the vehicle gear shift selector may
be required in order to obtain the engine
rpm necessary for the desired water pump
performance level.
8. Observe applied watering pattern. Adjust
spray head discharge angle, and fan opening
height and width to suit ‘best practices’ for the
haul road application.
During initial spray pattern testing, observe
spray head closure delay. Delayed spray head
closure is caused by the mechanical limitations
of the hydraulic spray system. These noted
delays will be helpful in predicting the actual
closure rate of the spray heads when adjusting
the spray pattern for oncoming traffic,
obstacles and setting up strip watering or
scotching patterns either manually or if
equipped with the intermittent spray timer.
Vertical side spray heads are typically located on
the front or rear of the top skin of the water tank.
The discharge opening is vertical to the tank and
sprays to the side. Vertical side spray heads can be
employed for applying water to high walls,
reaching over berms, or watering opposing traffic
lanes. Vertical side spray heads can be controlled
using the intermittent function.
Typical Default
Spray Head
Setting
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