Figure 4 – Exhaust fan
7. What is air velocity?
Air velocity in a finishing operation
is the term used to describe the
speed of air moving through the
empty spray booth.
8. What effect does air velocity
have on spray booth efficiency?
Air must move through the booth
with sufficient velocity to carry
away overspray.
Too low a velocity causes poor,
even potentially dangerous working
conditions, especially when the
material contains toxic elements. It
also increases maintenance costs.
Too high a velocity wastes power
and the energy required to heat
make-up air.
9. What is a manometer?
It is a draft gauge that indicates
when paint arrestor filters or intake
filters are overloaded. (see figure 5)
Some states and local codes
require a manometer gauge on
each bank of filters to comply with
OSHA regulations.
Figure 5 - Manometer
10. What does an air replacement
unit do?
The volume of air exhausted from a
spray booth is often equal to three
or more complete air changes per
hour.
Under such conditions, the
temperature may become irregular
and uncomfortable. Excessive dust
may become a problem.
To prevent these conditions,
sufficient “make-up” air must be
introduced to compensate for the
exhausted air.
The air replacement unit
automatically supplies this
“makeup” air - both filtered and
heated - to eliminate the problems
of air deficiency and airborne
contaminants.
Figure 6 - Air Replacement Unit
11. What routine maintenance
does a dry type spray booth
require?
(a) The continuous flow of air
through the booth eventually
loads the filters with dirt and
overspray. Periodically, inspect
and replacethem with
multi-stage filters, designed for
spray booth use. Single-stage
furnace filters will not do
the job.
(b) Monitor the manometer
reading daily, and know what
a normal reading should be.
(c) Keep the booth free of dirt and
overspray. Floors and walls
should be wiped down after
every job. Pick up scrap,
newspapers, rags, etc.
(d) Coat the inside of the booth
with a strippable, spray-on
covering. When the overspray
on it becomes too thick, strip
and recoat.
(e) Periodically check the lighting
inside the booth, and replace
weak or burned out bulbs.
Improper lighting can cause
the operator to apply a poor
finish.
12. What routine maintenance
does a waterwash type booth
require?
(a) Compounding of the water in
this type unit is essential.
Employ only booth treatment
chemicals in accordance with
suppliers’ recommendations.
The ph of the water should be
between 8 and 9.
(b) Maintain the water level at
the proper setting per
manufacturers’ specifications.
(c) Check the tank for paint
buildup on the bottom, check
the pump strainer to keep it
clean and clear, check the air
washer chamber and the
nozzles in the header pipe. If
the nozzles are plugged, the
overspray will encroach on the
wash baffle section, fan
and stack.
(d) Periodically check the float
valve for proper operation.
Flood the sheet to be sure
there is a uniform flow over
the entire surface.
8. Spray Booths (Cont’d)
26
(8 pages)
(32 pages)
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