ANSI/ASME B 16.9 Butt-Welding Fitting
ANSI/ASME B16.9 is a standard developed by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME). The standard is titled “Factory-Made Wrought Buttwelding Fittings,” it specifically addresses the dimensions, tolerances, materials, and testing requirements for butt-welding fittings.