Welded Seal-Ring Vacuum Closures

摘要

This is a preliminary report dealing with the development of bakeable high-vacuum flanges for the ORNL PIG Facility. The general design approach for this type flange is to obtain a bakeable vacuum seal by first welding thin metal rings to a set of heavy metal flanges, and then edge-welding the rings together. This design allows the option of O-ring sealing for non-baked operation. A number of flange designs are discussed together with fabrication, inspection, testing, and installation and maintenance information.