45-degree-elbow
The radius of a 45° elbow is the same as the radius of the 90° LR (1.1/2D).
Wall Thickness of Elbows
1. 90°-LR.. = 1.1/2 x 2(NPS) x 25.4 A=76.2 mm
2. 180°-LR.. = 2 times the 90° LR elbow A=152.4 mm
3. 90°-SR.. = 2(NPS) x 25.4 A=50.8 mm
4. 180°-SR.. = 2 times the 90° SR elbow A=101.6 mm
The weakest point on an elbow is the inside radius. ASME B16.9 only standardizes the center to face dimensions and some squareness dimensional tolerances. The wall thickness at the weld line location even is standardized, but not through the rest of an elbow. The standard states that the minimum tolerance will be within 12.5% of the minimum ordered wall thickness of the pipe. A maximum tolerance is specified only at the ends of the fitting.
Many providers of buttweld elbows (and tees) provide one schedule greater thickness so that sufficient wall thickness, after forming, remains.
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