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Title: Explosion Of Unconfined Clouds Of Natural Gas
Author: D. C. Bull, J. A. Martin
Source: American Gas Association 1977
Year Published: 1977
Abstract: This work deals principally with explosions and detonations in unconfined natural gas clouds. It reviews the work of others and notes their conclusions that deflagration to detonation transition is unlikely. The particular systems studied and reported concern direct initiation of hydrocarbon/oxygen/nitrogen mixtures and it is noted that initiation of spherical detonation of methane/air mixtures requires about 22 kilograms of Tetryl or its equivalent. Other heavier hydrocarbons are more readily detonable and hence practical natural gases may be expected to exhibit less stable characteristics than pure methane. Nevertheless initiation by the equivalent of about 1 kilogram of Tetryl would be required for most natural gases and with this in mind it is extremely doubtful whether detonation within the confines of buildings represents a sufficiently energetic source to initiate detonation within an unconfined gas cloud.

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