... ASME, ANSI, API, JIS LAP JOINT FLANGES are primarily employed with lap joint stubs, the combined initial cost of ... little, if any, better than that of slip-on flanges and the fatigue life of the ... welding neck flanges. The chief use of lap joint flanges in carbon or low alloy steel piping ... other equipment may be necessary.3,Types: Flat Face Flanges, Slip On, Welding Neck, Blind, Threaded , etc.4,Water ...