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.