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TABLE 10–1 Comparison of the Navy’s Proposed SEALs with the Subcommittee’s Recommended SEALs

 

Navy’s Proposed SEALs (ppm)a

Subcommittee’s Recommended SEALs (ppm)b

Gas

SEAL 1

SEAL 2

SEAL 1

SEAL 2

Ammonia

25

75

75

125

Carbon monoxide

75

85

125

150

Chlorine

2

5

1

2.5

Hydrogen chloride

2.5

25

20

35

Hydrogen cyanide

1

4.5

10

15

Hydrogen sulfide

10

20

15

30

Nitrogen dioxide

0.5

1

5

10

Sulfur dioxide

3

6

20

30

aU.S. Navy (1998)

bThe Subcommittee’s recommended SEALs are for an atmospheric pressure of 1 at 25°C. Values obtained for the gases using Dräeger tubes or other measurement devices in a disabled submarine might need to be corrected to an atmospheric pressure of 1 and 25°C.

exposure to the irritant gases—ammonia, chlorine, hydrogen chloride, nitrogen dioxide, and sulfur dioxide—are additive and not synergistic. The subcommittee believes that hydrogen sulfide should be considered an irritant gas and added to the CEI. The subcommittee also believes that a separate CEI should be established for carbon monoxide and hydrogen cyanide because the effects of exposure to these gases maybe additive as well. If the results of research conducted on the health effects from exposures to mixtures of gases show that the effects are not additive, then the CEI approach will have to be modified accordingly.

The effects of environmental conditions (e.g., humidity, temperature, and pressure) found on a disabled submarine on the toxicity of the gases should be studied. Also, because fires on a disabled submarine will generate participate matter, research should be conducted on the effects of particles on the toxicity of the gases.



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