Being a registered professional engineer I can't recommend it, but at 3 psi you will be OK if you absolutely limit the pressure to 3 psi. One easy way to do that is to put a large nozzle on top with a weight on it. You don't mind if the nozzle leaks a little air. For instance, a 2" sch 40 pipe has an internal area of 3.36 sq inches. At 3 psi that takes 10 lbs to hold the pressure. If you put a 4-1/2" round steel plate on the top that is 2" thick (or four 1/2" plates) that is about 9 lbs. With a normal air hose you would never overpressure a tank with a relief valve like that. too much leakage and the plate will vibrate off and leave a full 2" vent.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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