NCWayne said: (quoted from post at 19:02:07 05/28/14) This topic gets questioned, and cautioned several times a year, so if you go back and do a search you"ll probably come up with half a million ways to do it, and twice the amount of reasons not to.
That said, my advice every time someone asks is to recommend dry ice. It's readily available from several different grocery stores (at least around here), and it's cheap. The best thing is it does two things for you. One it is extremely cold so it keeps the tank temps from getting to hot, and, given that it"s pure C02, it will not promote combustion so the tank can"t explode. Too if you put in several pieces, it constantly replentishes itself.
That said I have repaired quite a few gas, diesel, and kerosene tanks using it and given that I am still here to type this it must work pretty well. Not to mention the outfit I got the trick from (via my Dad) used it in cutting up underground gas tanks in order to scrap them.
Agreed, if I had sufficient flow of CO2 from a tank or sufficient dry ice, I feel ok welding with torch or arc, but not so ok as to have bystanders. As for those who support sufficient cleaning & drying, I say you are at risk. Clean enough if you first burn it in a bonfire. Otherwise there are still vapors that come out of the metal seams of the tank when exposed to heat that can & will support explosion. Open enough to just burn & not explode? Virtually no tanks have adequate openings for that theory. Go find the expansion ratio for gas/air burn!
My Dad had done plenty water 'filled' but was doing it on borrowed time.....until the explosion.
This post was edited by JMOR at 16:47:37 05/28/14.
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