Tuyauteries, pipelines, canalisations
Veille normative mars 2018

ASME B16.25 , Extrémités de tuyauteries à souder bout à bout

Remplace ASME B16.25  (de décembre 2012).

Buttwelding ends

This standard covers the preparation of buttwelding 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 preparation of internal ends (including dimensions and tolerances). Coverage includes preparation for joints with the following:

• no backing rings;

• split or noncontinuous backing rings;

• solid or continuous backing rings;

• consumable insert rings;

• gas tungsten arc welding (GTAW) of the root pass.

Details of preparation for any backing ring must be specified when ordering the component. This 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 (“Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard”), B16.9 (“Factory-Made Wrought Buttwelding Fittings”), or B16.47 (“Large Diameter Steel Flanges: NPS 26 through NPS 60 Metric/Inch Standard”).

Publié par ASME le 29/12/2017