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Page Title:
Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres cont'd |
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|  DOE-HDBK-1092-2004
Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres (continued).
Ignition2
Flammable limits3
NEMA enclosure4
1
Flashpoint3
Ignition
Group3
Atmosphere
F
energy
(% by volume)
classification
Temp.C
F C
(millijoules)
Lower Upper
Indoor Outdoor
D
Hexane
437
225
-
1.1
7.5
-7
-22
7
8
D
Isoamyl alcohol
662
350
-
1.2
9.0@212F
109
43
7
8
D
Isoprene
428
220
-
1.5
8.9
-65
-54
7
8
D
Methane
999
630
0.30
5.0
15.0
Gas
Gas
7
8
D
Methanol
725
385
-
6.0
36.0
52
11
7
8
D
Methyl ethyl ketone
759
404
-
1.7@200F 11.4@200F
16
-9
7
8
D
Methyl isobutyl ketone
840
449
-
1.2@200F 8.0@200F
64
18
7
8
D
2-methyl-l-propanol
780
416
-
1.7@123F 10.6@202F
82
28
7
8
D
2-methyl-2-propanol
892
478
-
2.4
8.0
52
11
7
8
D
Naphtha (petroleum)
550
288
-
1.1
5.9
<0
<-18
7
8
D
Octane
403
206
-
1.0
6.5
56
13
7
8
D
Pentane
470
243
-
1.5
7.8
< -40
< -40
7
8
D
1-pentanol
572
300
-
1.2
10.0@212F
91
33
7
8
D
Propane
842
450
0.25
2.1
9.5
Gas
Gas
7
8
D
1-propanol
775
413
-
2.2
13.7
74
23
7
8
D
2-propanol
750
399
-
2.0
12.7@200F
54
12
7
8
D
Propylene
851
455
-
2.0
11.1
Gas
Gas
7
8
D
Styrene
914
490
-
1.1
7.0
88
31
7
8
D
Toluene
896
480
-
1.2
7.1
40
4
7
8
D
Vinyl acetate
756
402
-
2.6
13.4
18
-8
7
8
D
Vinyl chloride
882
472
-
3.6
33.0
Gas
Gas
7
8
D
Xylenes 867 to 984
464 to 529
-
1.0 to 1.1
7.6
81 to 90 27 to 32
7
8
Notes:
1
See NFPA 325 and 497M.
2
See "Handbook of Fire Protection Engineering", Society of Fire Protection Engineers.
3
See NFPA 325.
4
See NEMA 250, "Enclosures for Electrical Equipment."
5-20
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