We use alot of dry nitrogen for our helicopter emergency flotation systems and the cylinders we use for charging usually have around 2500 psi, and we use a Haskel bootstrap pump to fill the aircraft cylinder and ball shaped containers (aluminum wrapped in composite fiber) to 3000-3500 psi. Our newer systems use helium and the aircraft cylinders have 5000 psi. Again, they are aluminum with composite woven wrap. We do not service those. We install the N cylinders empty and charge, the He cylinders we install charged and I don't like doing that job. Aside from the chance of breaking off a valve and having a cylinder go wild, we always use hearing protection when dealing with high pressure gases.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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