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To: carranza2 who wrote (112268)5/2/2005 12:58:48 PM
From: unclewest  Read Replies (1) | Respond to of 793928
 
a large cloud of inflammable gas that had somehow ecaped was touched off in at least two points by welders doing a turnaround

The deflagration rate for most flammable gases is in the 800 feet per second range. Those welders had to be pretty durn quick for both to get a piece of that cloud and even then it would be perceived as a simultaneous rather than a successive explosion or fireball.

Most likely it was a fast fireball rather than an explosion from gas. Gas has to be confined to explode.