Product Manual

GENERAL PUMP A
member of the Interpump Group
DWSDBTK Industrial Water Sandblasting Kit
Ref 300610 Rev. A
03-06
OPERATION
Always wear protective clothing, including safety glasses while
operating machine.
Place the sand induction probe in the sand supply container.
Connect the mixing head to the spray wand. Start the machine
per manufacturer’s instruction.
Trigger the gun to activate the spray.
Check the distance to hold the spray nozzle from the surface by
starting to spray at a scrap of material from a distance of several
feet. Gradually move closer, checking frequently to see if the
high pressure spray is damaging the surface.
Refer to the application table for the type of sand recommended
for your work surface.
Always point the sand nozzle downward when not spraying. This
will prevent water from entering the sand supply. If water does
get into the sand supply hose, remove the probe from the sand,
hold control handle trigger open, and let the hose air dry. Always
be sure the sand hose is dry before using.
Keep the sand covered to prevent the overspray from wetting the
sand. Do not allow small fragments of the sand bag to fall into
the sand supply. A small paper fragment could prevent the flow
of sand.
After the sandblasting operation is complete, remove the probe
from the sand, trigger the gun to clear the hose and probe of
sand. Then remove the hose from the mixing head and rinse with
water to remove all the sand before storage.
APPLICATIONS
TROUBLESHOOTING
Sand Mesh: Sand mesh refers to the size of screen through
which a particular grade of sand will pass. A 16/50 mesh means
that normally, most of the particles will pass through a #16
screen and a very small percentage will pass through a #50
screen.
Note: A #16 screen has 16 0.046 holes per square inch.
Round Sand: This refers to the round edge of the grain of sand.
River sand is a good example of sand worn to its shape by
water.
Angular Sand: This refers to grains of sand which have triangu-
lar shaped edges. Crushed rock or sand is usually of this type.
Blasting Angle and Distance: The blasting angle can affect the
sandblasting distance. For the best sandblasting performance
always maintain the recommended blasting angle and the proper
distance for your work surface.
Sand Mesh Chart
Removal of: Sand Mesh Sand Type Blasting Angle
Paint from
Metal
20/40
Round
Silica
0 - 30
o
Paint from
Masonary
20/40
Round
Silica
0 - 20
o
Rubber Base Paint
from Masonary
10/35 Angular
0 - 15
o
Paint from Wood
(Course, Rough Cut
Effect)
40/60 Round
1 - 10
o
Paint from Wood
(Smoother, Drift-
wood effect)
20/40 Round 1 - 10o
Metal Scale 20/40 Round
0 - 15
o
Rust 16/50 Angular
0 - 25
o
PROBLEM PROBABLE CAUSE SOLUTION
No sand Plugged sand probe. Clear obstructions and make sure air vents in sand probe are open.
Plugged gun. Remove mixing nozzle and inspect mixing chamber.
Wet sand. Dry or replace sand.
Low vacuum. Close sand/air valve, or repair air leak in system.
Not enough sand Low water pressure. Check pump and spray tip for proper operation.
Incorrect spray tip. Change to 15
o
spray angle.
Collapsed hose. Replace hose, or remove restriction.
Partial obstruction to sand probe. Clear obstruction from sand probe inlet.
Spray Tip Spray tip replacement is made by removing the nozzle holder. The assembly should be thoroughly cleaned
Replacement of sand to prevent damage to the threads and clogging of the sand nozzle. A 9/16” socket can be used to
remove and install the new spray tip.
GGEENNEERRAALL PPUUMMPP
1174 Northland Drive • Mendota Heights, MN 55120
Phone: [phone] • Fax: [phone] • e-mail: [e-mail] • www.generalpump.com