I am currently helping one of my old physics professors and his Phd student designing a pressure vessel for ultra-sciencey detector (still figuring out the theory behind it all). So far we have the general vacuum tank that opens on the ends, with the pressure difference holding the ends on. However, the equipment needs to be checked after each test and it would be a pain to pull it all out to look at a single part (its over 1m long). Has anybody ever tried say, slicing the cylinder down the center, perpendicular to the cross-section, and then applying a pressure seal all the way around the edge? Looking for any creative ideas!