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Flammability of methane, propane, and hydrogen gases.

Authors
Cashdollar-KL; Zlochower-IA; Green-GM; Thomas-RA; Hertzberg-M
Source
Colloquium on Gas, Vapor, Hybrid and Fuel-Air Explosions, 1998 Sep; 2:77-101
Link
NIOSHTIC No.
20000093
Abstract
This paper reports the results of Pittsburgh Research Laboratory flammability studies on methane, propane, hydrogen, and deuterium gases in air. Knowledge of the explosion hazards of these gases is important to the coal mining industry and to other industries that generate or use flammable gases. The experimental research was conducted in 20-L and 120-L closed explosion chambers under both quiescent and turbulent conditions, using both electric spark and pyrotechnic ignition sources. The data reported here generally confirm the data of previous investigators, but they are more comprehensive than those reported previously. The results illustrate the complications associated with buoyancy, turbulence, selective diffusion, and igniter strength versus chamber size. Although the lower flammable limits (LFLs) are well defined for methane (CH4) and propane (C3H8), the LFLs for hydrogen (H2) and its heavier isotope deuterium (D2) are much more dependent on the limit criterion chosen. A similar behavior is observed for the upper flammable limit of propane. The data presented include lower and upper flammable limits, maximum pressures, and maximum rates of pressure rise. The rates of pressure rise, even when "normalized" by the cube root of the chamber volume (V1/3), are shown to be sensitive to chamber size.
Keywords
Pressure-chambers; Coal-mining; Mining-industry; Explosive-hazards; Flammable-gases
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, Pittsburgh, PA 15236
CAS No.
74-98-6; 74-82-8; 1333-74-0
Publication Date
19980901
Document Type
Conference/Symposia Proceedings
Fiscal Year
1998
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Priority Area
Other Occupational Concerns
Source Name
Colloquium on Gas, Vapor, Hybrid and Fuel-Air Explosions, Proceedings of the International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions
State
PA; IL
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