Confined Space Gases

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Confined Space Gases
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Heavier gases are more difficult to
ventilate than lighter gases WHY?
What do we use to ventilate with?
Normal Air Specific Gravity 1
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Methane 5 - 15
Carbon Monoxide 12.5 - 75 Hydrogen
4 - 74 Hydrogen
Sulfide 4.3 - 45 Propane
2.1 - 9.3 Acetylene
2.5 - 80
Hazards of ventilating concentrations of any of
these are IGNITION SOURCES! MOVING IRRESPIRABLE
GAS!
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Within a confined space, what is the minimum
percentage of Oxygen necessary?
19.5
Anything less means VENTILATE!
Most digital Oxygen detectors are set to alarm at
19.5
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Which gas has the greatest
specific gravity? A. Sulfur Dioxide B. Carbon
Dioxide C. Oxygen D. Nitrogen Dioxide
A. Sulfur Dioxide
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The explosive range of
Hydrogen is? A. 5 - 15 B. 12.5 - 75 C. 4 -
45 D. 4 - 74
D. 4 - 74
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Which of the following gases are liberated from
diesel equipment?
A. Carbon Monoxide B. Carbon Dioxide C. Hydrogen
Sulfide D. All of the above
Carbon Monoxide and Carbon Dioxide
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Which of the following gases are
explosive? A. Methane B. Oxygen C. Carbon
Dioxide D. Nitrogen E. Carbon Monoxide F.
Hydrogen Sulfide G. Hydrogen
Methane, Carbon Monoxide, Hydrogen Sulfide
Hydrogen
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What gases and what percent of each make up
normal air?
Nitrogen 78 Oxygen
21 Trace gases 1
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If you are ever concerned regarding the air
quality of any confined space MAKE SURE Your
life and the person who finds you depends on
YOU If there are no gas detection instruments
immediately available, DO NOT ENTER! VENTILATE!