I used to work at a place that made condenser and evaporator coils, brazed the fittings and return bends to the coil slab. The brazing line had a liquid oxygen tank outside and the fuel was plumbed in natural gas.
When I first went to work there the torches didn't have the check valves. Not sure how it would happen, getting the pressures set wrong, low oxygen pressure, but some how every now and then one of the hoses would explode! Always happened right at the torch end.
It was enough to blow the hose out, don't remember which one, but it was really loud. Never any continuing fire, no one ever got hurt, but the potential was certainly there.
I put check valves on all the torches, never had it happen after that.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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