The Cylinder you describe is a common off the shelf component. I can easily say it would be more cost effective to buy a already built/tested/certified cylinder from a reputable manufacturer/distributor. Save the time, headache, and safety concerns and buy something you know will preform. (and if it does fail its not your responsibility)
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Critically, how to you propose to mount the cylinder? Trunnion mount's, pin and clevis, end face mount's, ball mount's etc etc?
Also, is there only one of 'em?
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"A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools!" Douglas Adams 1952-2001. E&OE!
My humble calculation is that your cylinder at 2000psi produces well in the excess of 18tonnes of pressure and unless the rod is guided in PUSH mode, then it'll buckle probably on the first stroke except, if it is a short one.
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