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3D SYSTEMS, INC
.
PN:80-D27 Rev.B
GAS SAFETY
The DMP system use inert gas (Nitrogen, Argon) as a cover gas to create an inert atmosphere in the print chamber . The
cover gas inhibits any potential rapid combustion of particulate matter during the DMP process .
The oxygen content of air is approximately 21 percent . Displacement of the normal atmosphere with an inert gas can
reduce the oxygen content in a room . In the remote chance that an inert gas leaks into the room during the sintering
process, the situation can be hazardous .
3D Systems recommends that you have an oxygen monitor installed in the room containing the DMP system . This monitor
will alert you if the oxygen level drops below a designated point .
WARNING: BECAUSE ARGON IS HEAVIER THAN AIR, 3D SYSTEMS RECOMMENDS INSTALLING THE OXYGEN
MONITOR CLOSE TO THE FLOOR TO DETECT ARGON POOLING .
WARNING: EXPOSURE TO AN ATMOSPHERE CONTAINING 12 PERCENT OR LESS OXYGEN CAUSES
UNCONSCIOUSNESS WITHOUT ANY WARNING SYMPTOMS . THIS HAPPENS SO QUICKLY THAT YOU CANNOT
HELP OR PROTECT YOURSELF .
The table of
Oxygen Deprivation Effects and Symptoms
explains the potential effects and symptoms that can occur at
different concentrations of oxygen in the atmosphere .
When you work in an environment that may become oxygen-deficient, make sure you comply with the following items
:
•
If, at any time, you feel you are experiencing symptoms of oxygen deprivation, leave the area immediately .
•
You have received oxygen safety training .
•
The room is well-ventilated; at least 4 air exchanges per hour .
•
Self-contained breathing apparatus is available and easily accessible .
•
The room oxygen alarm monitor is functioning and audible .
•
Leave the DMP system room/area immediately when you hear the oxygen alarm .
Oxygen Deprivation Effects and Symptoms
OXYGEN CONTENT
(% BY VOLUME)
EFFECTS AND SYMPTOMS AT ATMOSPHERIC PRESSURE
a
15 – 19 %
Decreased ability to work strenuously . May impair your coordination or may induce
early symptoms in persons with coronary, pulmonary, or circulatory problems .
12 – 14 %
Increases respiration during exertion . Pulse rate goes up . May experience impaired
coordination, perception, and judgment .
10 – 12 %
Respiration continues to increase in rate and depth . Lips become blue . May lose
consciousness at this point .
8 – 10 %
Mental failure . Fainting and unconsciousness . Face becomes ashen, lips become
blue . Nausea and vomiting may occur .
6 – 8 %
100% fatal after 8 minutes of exposure .
50% fatal within 6 minutes .
Recovery with treatment within 4 to 5 minutes .
4 – 6 %
Coma within 40 seconds; convulsions, respiration ceases, death occurs .
a . From Safety Bulletin SB-2 - 1983—”1983 by the Compressed Gas Association, Inc . 1235 Jefferson Davis Highway, Arlington,
VA 22202