... ) Standard: ASME, ANSI, API, JIS, JPI, LAP JOINT FLANGES are primarily employed with lap joint stubs, the combined initial cost of the ... that of welding neck flanges. The chief use of lap joint flanges in carbon or low alloy steel piping systems is ... cutting flanges2) Materials:a) Carbon steelb) Stainless steelc) Alloy steel3) Standards:a) ANSI, DIN, EN1092-1, NFE, AS, JISb) Customers' drawings ...