ANSI/ASME B16.25 Standard covers the preparation of butt welding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for the preparation of internal ends (including dimensions and tolerances).
ASME B16.25 – Buttwelding Ends dimensions and tolerances
Coverage includes preparation for joints with the following:
(a) no backing rings(b) split or noncontinuous backing rings(c) solid or continuous backing rings(d) consumable insert rings(e) gas tungsten arc welding (GTAW) of the root pass Details of preparation for any backing ring must be specified when ordering the component.
Unless otherwise specified by the purchaser, it does not apply to welding ends conforming to ASME B16.5, B16.9, or B16.47.
ANSI/ASME B16.25 Standard applies to any metallic materials for which a welding procedure can be satisfactorily qualified, but does not prescribe specific welding processes or procedures. Unless otherwise specified by the purchaser, it does not apply to welding ends conforming to ASME B16.5, ASME B16.9, or ASME B16.47. Send us your technical drawings: Haihai Group will supply you with whatever flanges you are looking for.
| Nominal wall Thickness : t | End Preparation |
| t<5mm (for austenitic alloy steel t<4mm) | Cut square or slightly chamfer at manufacturer ‘ s option |
| 5<t<22mm (4<t<22mm) | Plain Bevel as in sketch ( a ) above |
| t>22mm | Compound Bevel as in sketch ( b ) above |
