BUTTWELDING FITTINGS ASME B 16.9 – Welding End Preparations

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Nominal Pipe Wall Thickness (t) End Preparation
Less than X* Cut square or slightly, at mfr’s. option
X* to 7/8 inch Plain bevel as in sketch “a” below
More than 7/8 Compound bevel as in sketch “b” below
X* = 3/16 for carbon steel, ferritic alloy steel or wrought iron;
1/8 for austenitic alloy steel