I was working on a rocket test stand and someone showed me what to do about a valve body leak. If the valve body leaks, just use an electric vibrating hand-held air pencil set to its longest stroke to smash the thing shut. I said “yeah, right - 1100 psi and 1000 df, and it will stop the leak”
Well he explained they had a pinhole leak on the railroad size N2 tanks and called the company about the leak. Well, an old guy went to the leak and went back to his truck and grabbed a hammer and a center punch. He put some spit on his finger and put it on the hole and gave it one good whack with the punch and hammer. Then he put some more spit on the leak. Well that’s fixed - anything else wrong? From that point on, we fixed the valve body using an air pencil.
From Dell / Intel® New Paradigms in Design Work Scott Hamilton, vertical market strategist for Dell Precision workstations, 5/2/2013 3
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