This is my first vessel I have designed and probably my last. We are wanting to build a vessel for pressure testing (with water) downhole tools. The ID of the vessel would be 6 inches and 8 feet long. The maximum pressure we would need to test at would be 20,000 psi at room temperature. This vessel will be small enough that it does not fall within ASME Section VIII Div.1's scope, but that is the code I am designing to (anyone have a more appropriate code?). So far, I am just considering the shell and haven't started considering the fittings that will need to be installed. I calculate a required wall thickness of 2.2 inches based on a max. allowable stress of 40,000 psi. This max. allowable is loosely based off of SA 693 (17-4 PH) material. Now I realize that this won't actually work forming a plate this thick into this tight of a radius, for a couple reasons.
So, my question is really, what do people make such a vessel from? Am I going to have to have this cast or forged?
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