Tuesday 3 April 2012

EXPLOSIVE LIMITS


The lower and upper explosion concentration limits for some common gases are indicated in the table below. Some of the gases are commonly used as fuel in combustion processes.
Fuel Gas
"Lower Explosive or Flammable Limit"
(LEL/LFL)
(%)
"Upper Explosive or Flammable Limit"
(UEL/UFL)
(%)
Acetaldehyde
4
60
Acetone
2.6
12.8
Acetylene
2.5
81
Ammonia
15
28
Arsine
5.1
78
Benzene
1.35
6.65
n-Butane
1.86
8.41
iso-Butane
1.80
8.44
iso-Butene
1.8
9.0
Butylene
1.98
9.65
Carbon Disulfide
1.3
50
Carbon Monoxide
12
75
Cyclohexane
1.3
8
Cyclopropane
2.4
10.4
Diethyl Ether
1.9
36
Ethane
3
12.4
Ethylene
2.75
28.6
Ethyl Alcohol
3.3
19
Ethyl Chloride
3.8
15.4
Fuel Oil No.1
0.7
5
Hydrogen
4
75
Isobutane
1.8
9.6
Isopropyl Alcohol
2
12
Gasoline
1.4
7.6
Kerosine
0.7
5
Methane
5
15
Methyl Alcohol
6.7
36
Methyl Chloride
10.7
17.4
Methyl Ethyl Ketone
1.8
10
Naphthalene
0.9
5.9
n-Heptane
1.0
6.0
n-Hexane
1.25
7.0
n-Pentene
1.65
7.7
Neopentane
1.38
7.22
Neohexane
1.19
7.58
n-Octane
0.95
3.20
iso-Octane
0.79
5.94
n-Pentane
1.4
7.8
iso-Pentane
1.32
9.16
Propane
2.1
10.1
Propylene
2.0
11.1
Silane
1.5
98
Styrene
1.1
6.1
Toluene
1.27
6.75
Triptane
1.08
6.69
p-Xylene
1.0
6.0
Note! The limits indicated are for gas and air at 20oC and atmospheric pressure.

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