I brought home a tank (came with a huge MIG welder) where I thought
the cap was sitting snugly. Tank was made in 1942. Moved it around,
etc etc. Took off the cap to check pressure. Then after checking
remaining pressure in that tank, I tried to put it back on. TO my
surprise, the cap simply lid right back on over the threads. The cap
did not need to be screwed except perhaps for the last turn.
If I lifted this tank by the cap, without any doubt, it would be a
disaster, maybe of small pro****tions.
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