TB 43-0213
also using the sand injector kit for wet sandblasting of
WARNING
large corroded areas. In the application shown, the
water source is hooked up to the pump, The power
Silica exposure hazards exist whenever sand
source operates the pump motor. Water is drawn by the
particles are injected into the air, Wet
pump and pressurized out to the gun assembly and
sandblasting lessens health risks, but care
wand. The sand injector kit is a simple tube device. One
must be taken to ensure that applicators
end of the tube is inserted into a container of dry sand.
use the recommended protective equip-
The opposite end of the tube is connected to the end of
ment. Silica exposure due to failure to wear
the wand. Pressure from the water shooting out the
protective equipment can result in silicosis,
wand draws the sand up through the tube.
a lung disease similar to emphysema.
NOTE
Sand is used to clean away corrosion from
large areas of the vehicle. Sand itself is
highly abrasive and will quickly wear the
affected surface down to bare metal.
b. Sand injector kits for wet sandblasting of
corroded surfaces can also be adapted for use with
powerwash equipment. Wet sandblasting should never
be implemented indoors nor without use of protective
clothing, gloves, goggles, ear protection, and facial
respirators.
c. Commercial literature is available upon request
from each of the suppliers of powerwash equipment
listed in Table 3-2. This literature provides much valid
and useful information with regard to equipment
specifications, operation, and maintenance, CPC
officers responsible for establishing a rustproofing
program can use the commercial literature to determine
which type of equipment best suits the operation, and to
obtain maintenance information for the equipment of
TA504753
choice.
Figure 3-1. Standard Powerwash Equipment.
g. With the sand injector removed, the unit
d. All powerwash equipment suppliers listed in
illustrated in Figure 3-2 becomes a simple washer used
for cleaning the vehicle of dirt, oil, etc. The wand's
endorses one product or supplier over another. Sample
nozzle should be held a foot or so from the surface
troubleshooting instructions provided in Table 3-3 are
being cleaned and sprayed at an angle to the surface in
typical or representative of such equipment.
order to get underneath the grit. Stubborn deposits may
e. All powerwash equipment, regardless of size,
require the application of a detergent (see para-
power source, or portability, have common compo-
graphs 2-21 and 2-28). Detergents should be applied to
nents (see Figure 3-1).
an area from the bottom up and rinsed away from the
top down with the high pressure washer,
portable powerwash equipment operation with remote
for a typical powerwash unit. Nomenclature used in this
power (electrical) and water source. The applicant is
wearing the proper safety equipment and clothing and is
table is referenced to Figure 3-3 through Figure 3-6.
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