I drove a tanker truck for years. Had a few cracks in the aluminium. Hauled gas diesel and oil. Went to certified welders. To get repaired. Truck had 5 tanks with double bulkheads. They had a big air blower. Looked like a big turbocharger. They worked in a roof only shed. 6 in. Pipe above truck with five 4in. Soft hoses to put into tanks.also 4 shop vacs. With small hoses to blow between bulk heads. Then opened all bottom valves. Then went for a long coffee break. When air coming out bottom smelled fresh. He crawled inside and welded till got Smokey. Then I would put 4" hose back inside. Had to pull it out to weld. Would blow his arc gas away. I have welded gas and diesel tanks since. Always blow for a couple hrs. Or till no smell. Only safe way. On a 18000 gal gas tank he blowed it for 24hrs.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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