Model 3710 Plasma Control Console
Operator’s
Manual
_____________________________________________________________________________________________________________________
Issued: 01/02
Page
16
Volume of space in which the operation is performed
Number of spray/abrasive blast units operating in that space
Sources of hazardous fumes, gases, or dusts (varies depending on material
sprayed)
Heat generated by the spraying process
Presence of volatile solvents
Where thermal spraying operations are incidental to general operations,
apply local exhaust ventilation to the spray areas to prevent contamination
of the general work area.
Carefully maintain individual respiratory protective devices. Clean and
disinfect devices before transferring them between employees (see
ANSI
Z88.2
).
Provide mechanical ventilation for operations not performed in the open or
in a properly designed and ventilated room. Ventilation equipment
usually consists of motor driven portable exhausters with flexible piping
or ducts that remove dust rapidly and allows operators suitable visibility.
A ventilation system does not preclude the need for respiratory protection
devices. See "Respiratory Protection," section 1.5.2, for recommendations
on protective devices and filtration systems.
When thermal spraying on a machine tool such as a lathe, mount an
exhaust hood at the end of the carriage so that it travels with the gun,
exhausting dust and fumes into the dust collector. Aim the gun so the
sprayed material enters the face of the hood. An average lathe hood is
about 2 ft
2
(0.2m
2
) and the velocity of air entering the opening should be
at least 200 feet/minute (1 m/s). The hood opening design should eliminate
turbulence along the sides that could force spray dust into the operator's
breathing zone. In permanent installations, the entire tool is enclosed
except the front; air enters the enclosure at approximately 300 feet/minute
(1.5 m/s). The hood top can be hinged to facilitate loading and unloading
with a crane. In automatic and production spraying, the entire mechanism
is often totally enclosed. Refer to "
Industrial Ventilation
" published by
the American Conference of Governmental Industrial Hygienists
(ACGIH).
Provide exhaust equipment for dry grinding or lapping operations
performed on sprayed coatings. Consult
ANSI Z43.1, Ventilation
Control of Grinding, Polishing and Buffing Metals.
