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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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