This Standard covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements forwelding 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; and gas tungsten arc welding (GTAW) of the root pass. Details of preparation for any backing ring must be specified when ordering the component.