"Roger" wrote

The tank was drained when they struck an arc. It blew out part of the
back end of the trailer. Unfortunately that caused the trailer to
jump forward and there was a guy standing on the rear of the tractor.
Whether it sheared off the 5th wheel or what happened I'm not sure,
but it squashed the guy between the tank and back of the cab like a
bug

Bad news. What is the right way to weld something that large? I know with
something small, like a gas tank, or can, you fill it with inert gas to
displace the oxygen. How about the tanker? Dry ice, to make carbon
dioxide?

I do know that gas fumes are more dangerous in very damp, humid settings,
even when outdoors. I remember a pile of wet leaves jumping off the ground
a couple of feet. I also know a guy that was severely burned, trying to
light a wet brush pile, when the fumes jumped back. It seems they hold to
the ground more, or are more concentrated.
--
Jim in NC
--
Jim in NC