Hazardous Gases - Teledyne 6712FR Installation And Operation Manual

6712FR Refrigerated Sampler
Appendix C General Safety Procedures
C.3 Hazardous Gases
Chemical Common
Gas
Formula Properties
Ammonia NH Irritant and
3
poisonous. Col-
orless
with characteris-
tic
odor.
Benzene C H Irritant, colorless
6 6
anesthetic
Carbon CS Nearly odorless
2
Bisulfide when pure, color-
less, anesthetic.
Poisonous.
C-6
amounts that could cause discomfort and illness, but under that
condition, the explosion hazard would be far more serious. The
explosimeter tests, as well as the sense of smell, would warn of
the danger. Pipelines in chemical plants might contain any
number of harmful vapors. They, too, are sensed by smell and
explosimeter tests if they get into the public sewer. Such occur-
rences are rare.
The attempt to instill a sense of urgency about real hazards is
diluted if a man is told to give attention to a long list of things
that in fact are irrelevant.
Be very careful to avoid high H
atmospheres, and hazards of physical injuries. Remember that
much H S may be released by the stirring up of sludge in the
2
bottom of a structure. Obey your senses in respect to irritating
gases, such as chlorine (unconsciousness comes suddenly from
breathing too much). Be cautious about strange odors. Do not
determine percent oxygen in the air. There is a danger that the
result will influence a man's thinking about the seriousness of
the real hazards. Most important, use ample ventilation, and do
not enter a potentially hazardous structure except in a good
safety harness with two men at the top who can lift you out."
The following table contains information on the properties of

hazardous gases.

Table C-1 Hazardous Gases
Specific Max
Gravity Safe 60
Physiological
or Vapor Min.
Effect
Density Exposure
Air =1 ppm
0.60 Causes throat 300
and to
eye irritation at 500
0.05%, cough-
ing
at 0.17%. Short
exposure at
0.5%
to 1% fatal.
2.77 Slight symp- 3,000
toms to
after several 5,000
hours
exposure at
0.16% to 0.32%.
2% rapidly
fatal.
2.64 Very poison- —
ous,
irritating, vom-
iting,
convulsions,
psychic distur-
bance.
S concentrations, flammable
2
Explosive Likely
Max. Safe
Range (% by Location
8 Hour
vol. in air) of
Exposure
Limits Highest
ppm
lower/upper Concentration
85 16 25 Near top.
Concentrates
in closed up-
per spaces
25 1.3 7.1 At bottom.
15 1.3 44.0 At bottom
Simplest and
Most
Cheapest
Common
Safe Method
Sources
of Testing
Sewers, Detectable
chemical odor at low
feed concentrations
rooms.
Industrial Combustible
wastes, gas indicator
varnish,
solvents.
An insecti- Combustible
cide gas indicator