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Old 11-14-2016, 11:10 AM   #11
Terry, NJ
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Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,749
Default Re: Air Compressors and Blow Guns

Mine is an upright 1947 American compressor that was given to me. My friend Kris was threatening his father to get it out of there or he was going to scrap it. I took it instead and promised his father (An old friend) that he could have back whenever. It's in good shape, But there are two 2-21/2" plugs in the side. I opened the bottom and took about 5 lbs of soggy rust particles out of the bottom. This kinda scared me and I lowered the cut off pressure setting to 90Lbs from 120Lbs. But from an old experience with hot water expansion tank that blew out the side of the garage........ It ain't necessarily the pressure that get you, It's the atmospheres! One atmosphere is 14.7lbs, two atmosperes are 29.4 and so on..This is why they test hydrostatically, because when a tank's volume is full of water with a very small airspace then you don't have that much airspace throwing metal around
the room. When it's all air, then you get a lot of expansion and it throws shrapnel in all directions.
Terry
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