... that of welding neck flanges. Their calculated strength under internal pressure is approximately two-thirds that of welding neck flanges, and ... of BS, ANSI, JIS, DIN, and UNI.2,Flanges are the connectors used in process piping to connect pipe to tees, ... equipment may be necessary.3,Types: Flat Face Flanges, Slip On, Welding Neck, Blind, Threaded , etc.4,Water , Oil, Gas, Industrial ...