Model 3710 Plasma Control Console
Operator’s
Manual
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Issued: 01/02
Page
15
not reflected onto the face shield. Wear aluminized gloves and dark, fire-
retardant clothing.
Arc spraying radiation protection is similar to that for electric arc welding
and is outlined in
ANSI/AWS Z49.1
. Some arc spraying guns are
equipped with an arc shield that protects the operator from direct exposure
to the arc. Also use a helmet if any parts of the body are exposed to direct
arc radiation or if exceptionally reflective substrates are being sprayed.
1.5.5 Confined
Spaces
Spaces such as a closed tank, boiler, pressure vessel or ship compartment
are considered confined spaces. Review
AWS F3.1, Recommended Safe
Practices for the Preparation for Welding and Cutting of Containers
and Piping That Have Held Hazardous Substances
, if the confined
space previously held combustible materials.
Work in confined spaces requires ventilation. See the standards referred
to in "Compressed Gas Cylinders" in section 1.4.1 of this manual for
ventilation requirements. When you are thermal spraying in any confined
space, keep the gas cylinders out of the work space.
1.5.5.1 Rapid Emergency Exit
If operators must enter a confined space through a small opening, provide
the means for rapid emergency exit. If operators are using safety belts and
life lines for this purpose, attach them to the operator's body so they will
not jam in a small exit space. Station at least one attendant trained in
rescue work outside the confined space at all times and verify this person's
ability to remove the operator from the confined space if an emergency
should occur.
1.5.5.2 Factors to Consider
To eliminate the chance of gas escaping through leaks or improperly
closed valves, prior to entering the confined space, close the gun valve and
shut off the gas supply at a point outside the confined space. If possible,
remove the gun and hose from the confined space. Evaluate oxygen level
inside the confined space with oxygen monitoring equipment. The
amount of contamination to which an operator is exposed during spray
operations depends on many factors. Consider the following factors when
selecting ventilation systems for operator safety:
