ASME B16.9 L/R Elbows

August 20, 2020

Technical Drawings

Standard drawing of ASME B16.9 90° & 45° long radius (L/R) elbows.

The ASME B16.9 elbow is used when a pipe changes direction. Elbows can turn up, turn down, turn left, right, or any angle in between. The long radius (L/R) elbows denote elbows with the center-to-end dimension of 1.5D radius which equals to 1.5 x NPS in inch unit. The standard long radius elbows of ASME B16.9 can be further classified as 90° and 45° according to the angle of the flow-direction change.

Dimensions

NPS	O.D mm inch	A mm inch	B mm inch
1/2	21.3 0.84	38 1.50	16 0.62
3/4	26.7 1.05	38 1.50	19 0.75
1	33.4 1.32	38 1.50	22 0.88
1-1/4	42.2 1.66	48 1.88	25 1.00
1-1/2	48.3 1.90	57 2.25	29 1.12
2	60.3 2.38	76 3.00	35 1.38
2-1/2	73.0 2.88	95 3.75	44 1.75
3	88.9 3.50	114 4.50	51 2.00
3-1/2	101.6 4.00	133 5.25	57 2.25
4	114.3 4.50	152 6.00	64 2.50
5	141.3 5.56	190 7.50	79 3.12
6	168.3 6.62	229 9.00	95 3.75
8	219.1 8.62	305 12.00	127 5.00
10	273.0 10.75	381 15.00	159 6.25
12	323.8 12.75	457 18.00	190 7.50
14	355.6 14.00	533 21.00	222 8.75
16	406.4 16.00	610 24.00	254 10.00
18	457.0 18.00	686 27.00	286 11.25
20	508.0 20.00	762 30.00	318 12.50
22	559.0 22.00	838 33.00	343 13.50
24	610.0 24.00	914 36.00	381 15.00
26	660.0 26.00	991 39.00	406 16.00
28	711.0 28.00	1067 42.00	438 17.25
30	762.0 30.00	1143 45.00	470 18.50
32	813.0 32.00	1219 48.00	502 19.75
34	864.0 34.00	1295 51.00	533 21.00
36	914.0 36.00	1372 54.00	565 22.25
38	965.0 38.00	1448 57.00	600 23.62
40	1016.0 40.00	1524 60.00	632 24.88
42	1067.0 42.00	1600 63.00	660 26.00
44	1118.0 44.00	1676 66.00	695 27.38
46	1168.0 46.00	1753 69.00	727 28.62
48	1219.0 48.00	1829 72.00	759 29.88

*NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; A: Center-to- End, 90-deg Elbows; B: Center-to- End, 45-deg Elbows.

ASME B16.9 Butt Welding Fittings
Elbow L/R	Reducing Elbow	Return L/R
Elbow S/R	Return S/R	3D Elbow
Tee & Cross	Reducing Tee	Reducing Cross
Stub End	Cap	Reducer
End Bevel	Tolerance	Wall Thickness

*Click to view dimensions of other ASME B16.9 standard fittings.

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