The way you weld a gas line that is less say 24" is to put dry ice in
the pipe. you block it off on one end and put about 40 pounds of dry
ice in a bucket of water lit gas off and weld away.

Larry


On Mon, 14 Mar 2005 19:56:57 -0000, "bigegg"
wrote:

Peter Fairbrother wrote:
The tiny holes in bulk sand are sufficiently small and dispersed and
surrounded by sand so that even if one ignited* the sand would
quickly damp out the flame and it would not spread.

* this would actually be impossible, with the cold sand forming the
walls of the cavity so close



Hard to fill a tank with sand so that there are no large voids
though, and hard to be sure. Same with filling it with concrete, will
there still be any large voids? Because they _will_ fill with fumes,
even through concrete, if there are any fumes to be had (and if there
aren't any, then it doesn't matter anyway).

I would use sand, and a concrete poker to make sure there's no voids.

Also - anyone familiar with a "desert burner" (1)
Basically, it's a bucket full of sand and petrol (gasoline), making sure
there are no puddles on the surface. Drop a match on and it burns
(controllably) for a good five or six hours.

Don't know if this will work in an enclosed tank.