Hi Yol,
I'm not sure of what are you asking in regard of drafting pressure vessels;- as far as I know, there is no software to make pressure vessels drawings. There are a few specialized programs for the design of pressure vessels, like PV Elite, Compress, etc.... These programs are configured to perform calculations in accordance with a specific design code, like ASME VIII, EN 13445, etc...The software will produce in the end a sketch of the vessel configuration, which will be used for the generation of several, specialized drawings required for the definition and fabrication of the pressure vessel. These complete drawings are produced by designers on AutoCad or other similar drafting software. Can you please refine a bit your query, what you expect to get from a pressure vessel design software and how do you expect the software to produce pressure vessel drawings?
cheers,
gr2vessels