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Old 12-14-2013, 08:55 PM
crystallographic crystallographic is offline
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Originally Posted by johnptc View Post
I have been warned that it is very dangerous to use hydrogen gas in any equipment that was previously used with acetylene.

Does any one know the details of why this might lead to an explosion
Welcome JM,
I've heard the warning for years, not to put H2 through a hose or torch that has seen use with Acet because it can go BLAM. I cannot give you the chemistry on that, but the airlines are very careful about transporting O/A welding torches and hoses because of the acetylene residues. Perhaps acetone from the acet will mingle with hydrogen in the form of peroxide?

I also cannot give the chemistry of how chlorinated hydrocarbons turn into phosgene gas in the presence of high frequency (TIG) welding, but I don't use brake cleaner around the TIG.

"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
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