Model 1264 Powder Feeder
Operator’s Manual
_____________________________________________________________________________________________________________________
1.5.2
Respiratory Protection
Respiratory protection is necessary for most spray and blast operations.
Selection of device is determined, in accordance with
ANSI Z88.2
, by the
nature, type, and magnitude of the fume and gas involved.
Select only
devices approved by the U.S. Bureau of Mines, National Institute of
Occupational Safety and Health (NIOSH), or an other approved
authority.
Suggested devices for typical thermal spraying and blasting
operations include:
Blasting in the open
:
use a
mechanical filter respirator
with a face
shield and dust hood
or
a self-contained breathing apparatus.
Thermal spraying in confined or semi-confined spaces
: use an
air line
respirator
. Use a device similar to the one described below for abrasive
blasting.
Abrasive blasting in confined or enclosed spaces
: use a
continuous
flow air line respirator
consisting of a continuous flow air line respirator,
a full face piece or helmet, and dust hood sufficient to protect the head and
neck from rebounding abrasive material. Minimum air flow to the
respirator should be 4 CFM (113.3 L/minute) at the face piece and 6 CFM
(170 L/minute) entering the helmet or hood. Fresh air blowers are
preferred to compressed air as an air source of respirator air. If adequate
ventilation is not provided, use an in-line vortex cooler when possible for
operator comfort. Filter the air supply line to remove objectionable odors,
oil or water mist (or both), and rust particles from the air. Locate the air
intake to ensure the respirator receives clean, dry air (CDA). If gaseous
air contaminants such as carbon monoxide are possible, use a separate air
purifier. Grade D or better compressed air is considered breathable.
Thermal spraying in an open or a well-ventilated work area
: additional
respiratory protection may not be necessary. In borderline cases, use
approved
mechanical filter respirators
for protection against dust and
metal fumes. Borderline cases are those that consist of light work or short
duration with nontoxic materials, but with some dust exposure.
Continuous flow air line respirators are adequate for thermal spraying
operations involving most commonly used materials. If the respirator air
supply fails and the contaminant in the space is not immediately harmful
to health, the operator may stop operations, remove the supply line, and
return to breathable air.
Issued: 10/11
Page
9
