Tolerances of Buttweld Pipe Fittings

Butt-welding is the process of joining two pieces of material together along a single edge in a single plane.

Butt-welding is the process of joining two pieces of material together along a single edge in a single plane.

Alignment tolerances are concerned with the way that the ends of a fitting are cut. Exaggerated distortions are shown for clarity in the diagram below.

Alignment tolerances are concerned with the way that the ends of a fitting are cut. Exaggerated distortions are shown for clarity in the diagram below.

Tolerances are in millimeters. mm -ASME / ANSI B16.9

All Fittings 90, 45 Elbows and Tees Reducers Caps 180 Returns Angularity Tolerance
Nominal Pipe Size Outside Diameter at Bevel Inside Diameter at End Wall Thickness Center to End Dimension Overall Length Overall Length Center to Center Dimension Back to face Dimension Alignment of Ends Nominal Pipe Size off Angle off Plane
(in) D t A.B.C.M H E O K U (in) Q P
1/2to 21/2 +1.52-0.76 0.76 Not Less Than 87.5% of Nominal Thickness 1.52 1.52 3.05 6.35 6.35 0.76 1/2 to 4 0.76 1.51
3 to 31/2 1.52 1.52 1.52 1.52 3.05 6.35 6.35 0.75 5 to 8 1.52 3.05
4 1.52 1.52 1.52 1.52 3.05 6.35 6.36 0.76 10 to 12 2.29 4.83
5 to 8 +2.29-1.52 1.52 1.52 1.52 6.35 6.35 6.35 0.76 14 to 16 2.29 6.35
10 to 18 +4.06-3.05 3.05 2.29 2.29 6.35 9.65 6.35 1.52 18 to 24 3.05 9.65
20 to 24 +6.35-4.83 4.83 2.29 2.29 6.35 9.65 6.35 1.52 26 to 30 4.83 9.65
26 to 30 +6.35-4.83 4.83 3.05 4.83 9.65 32 to 36 4.83 12.7
32 to 36 +6.35-4.83 4.83 4.83 4.83 9.65
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