ASME B16.25 establishes standards for the preparation of buttwelding ends on piping components, covering bevel designs for various wall thicknesses. It ensures proper fit-up for metallic piping systems by defining tolerances for welding bevels, root faces, and internal diameter shaping. For detailed specifications, see the documentation available on Scribd . ASME B16.25: Buttwelding Ends Standard | PDF - Scribd