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ES&H
Manual Flammable
Gas Supplement |
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Chapter 7 Heats of Combustion |
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Hydrogen equivalent, Q
The heat of combustion for other gases is used to determine the
hydrogen equivalent mass, Q, for use in Figure 1 in the Flammable Gas Supplement Chapter 1
Storage/Use of Flammable Gases.
For example the table indicates that ethane has 0.36 times the heat of
combustion of hydrogen per unit mass. Therefore
1.7 kg of ethane is equivalent to 0.6 kg of hydrogen in determining Risk Class.
Heats of Combustion
The following
table of heats of combustion may be useful for calculating hydrogen equivalents. The heats of combustion can be found in, for
example, The Handbook of Chemistry and Physics, 77th
Edition, 1997.
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Gross
Heat of Combustion |
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Gas |
Molecular
Weight |
(kj/g) |
Relative to
that of Hydrogen |
hydrogen-H2 |
2 |
143 |
1.00 |
deuterium- D2 |
4 |
72 |
.50 |
methane-CH4 |
16 |
55 |
.39 |
acetylene-C2H2 |
26 |
50 |
.35 |
ethane-C2H6 |
30 |
51 |
.36 |
propane-C3H8 |
44 |
50 |
.35 |
isobutane-C4H10 |
58 |
49 |
.34 |
dimethyl ether- (CH3)2O |
46 |
32 |
.22 |
Revision
Summary
Periodic Review 05/06/16 No changes per TPOC
Revision 1.0
06/15/11 New
content
TECHNICAL POINT-OF-CONTACT |
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