... of slip-on flanges and the fatigue life of the assembly is only one-tenth that of welding neck flanges. The chief use of lap joint ... and whatever other equipment may be necessary.3,Types: Flat Face Flanges, Slip On, Welding Neck, Blind, Threaded , etc.4,Water , Oil ... for special use4) Sizes we can produce: DN10 to DN30005) Types we can supply: WN, SO, BL, plate, thread, socket and ...