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Stripe Hog Operation
4.3 Waterblasting Operations
Before you start the job, you should evaluate the
pavement you will be working on, the material to
be removed, and choose the appropriate spray bar
and/or nozzles best suited for the job. You should
also consider the desired or expected profile of the
blasted surface in your selection. There are many
variables that affect blasting efficiency, productiv
-
ity and the profile of the blasted surface. As the
operator becomes more experienced, the selection
process becomes more refined and easier.
Generally, large, high volume (.015 - .017) nozzles
are the most aggressive and provide faster results,
but more potential for damage and a course pro-
file. High volume nozzles should be used only on
strong pavement (concrete or newer pavement).
Small, low volume (.007 - .011) nozzles are less
aggressive and will provide somewhat slower re-
sults but less damage potential and a smoother
profile. Low volume nozzles are well suited for
weak pavement (older or damaged pavement).
Low volume nozzles are typically a better choice
for inexperienced operators on any surface.
Hog Technologies offers an on-site training pro
-
gram that dramatically reduces the learning curve
and increases productivity. If you are new to
Waterblasting, we highly recommend that you
consider this factory training for your operators.
You can also contact Hog Technologies Customer
Service department for assistance in choosing
spray bars and nozzles or more information re-
garding the factory training program.
Waterblasting Guidelines:
Evaluate the Pavement and Select a Spray Bar
• Strong pavement withstands high aggression
spray bars. This is generally concrete or new
asphalt.
• Cracked pavement is weak and will require
lighter aggression spray bars.
• Brittle pavement is a challenge and will require
lighter aggression spray bars and reduced
pressure.
• Consider spray bar width. Choose a spray bar
2” wider than the line being removed to pro-
vide steering tolerance plus slight over spray
to reduce the need to back up and re-do sec-
tions.
Do’s
• Pre-clean the work area with a power broom
before blasting.
• Stop blasting before stopping the truck. Blast
-
ing with the unit stopped will damage the
pavement and Hog Head.
• Stop blasting before changing direction.
• When in doubt, choose a less aggressive spray
bar. It is always best to error on the side of
caution.
• Adjust the forward speed and head rotation
to remove 95% of the paint in a single pass
to eliminate a second pass and more potential
for damage.
• Adjust the pressure for the pavement. Typi
-
cally blast pressures between 32,000 and
38,000 PSI are used.
• Check and clean the vacuum filter frequently to
ensure strong vacuum pressure while blasting.
A dirty filter and low vacuum will leave exces
-
sive paint chips and debris on the pavement
slowing productivity.
• Check the pavement frequently and watch the
outer edges of the lines for damage. Continu-
ously make adjustments as required.
Don’ts
• Do not allow untrained personnel to operate
Stripe Hog equipment.
• Do not continue blasting with a damaged
nozzle. It can cause damage, waste water,
reduce the power of other nozzles and slow
production.
• Avoid running the Hog Head wheels on rumble
strips. Always adjust the Hog Arm to keep the
wheels off the rumble strips.
• Do not blast directly on sealed joints in the
pavement. Especially weather stripping on
bridges or airfields.
• Do not blast over pavement markers. Markers
can damage the blast head and spray bars and
should be removed prior to blasting.
• Do not blast over damaged or uneven pave
-
ment that can damage the blast head and
spray bar.
Summary of Contents for Stripe Hog SH5000
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