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I have not been able to get the latest under-pressure software to work on my computer, however previous DOS versions did not take enough factors into account for serious manned or unmanned designs, in my opinion. It has some use to provide a general idea of some limitations, however I believe the ABS spreadsheet available from PSUBS takes many more factors into account and will provide a better design. For thick wall vessels (no ribs) you can also use the "unstiffened cylinder" calculator on PSUBS which also is based strictly upon ABS formula. For PVC, you can compare the results of the under-pressure program with the information in http://www.us.piping.georgefischer.com/external/us_handbook/03.pdf What size PVC where you contemplating using? Jon On 12/16/2010 2:24 PM, Daniel Kubiak wrote: I'm just getting started in this arena, but I came across a nice program called "Under Pressure" for examing pressure hulls. As a newbie it is interesting to see how various shapes and materials respond under pressure. My first project is going to be an unmanned vehicle to photograph the shipwrecks in the great lakes. I assumed PVC would be sufficient for this and was shocked to see in Under Pressure that it would fail at a mere 25 ft (based on the schedule I had planned to use). I'm not putting life at risk yet, but this saved me some $$ replacing electonics and really opened my eyes to realize that I need to KNOW what will and will not work. |