You'd be surprised at some of the things people do with just enough knowledge to be dangerous.
Good buddy of mine thought he'd leak down test a 275 gal fuel tank. Unfortunately, he had no clue what the pressure limitations of the vessel might be, and apparently never gave it a thought. He estimates it was somewhere around 30 psi when one of the end welds let go. It cost him close to 3 grand to repair the neighbor's swimming pool, railing, and privacy fence where the remainder of the tank came in for a landing a couple hundred yards away. Thankfully, there were no injuries, and the neighbors are calm and reasonable people.
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