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ASME B16.9 Reducer

August 27, 2020

Technical Drawings

Standard drawing of ASME B16.9 Reducer.

The reducers are often used when the piping designers want to reduce the diameter of a straight run of pipe. There are two styles of standard reducers available in ASME B16.9: Concentric – having a common centerline; Eccentric reducer – having offset centerlines.

Dimensions

NPS	O.D L mm inch	O.D S mm inch	H mm inch
3/4 x 1/2	26.7 1.05	21.3 0.84	38 1.50
3/4 x 3/8	26.7 1.05	17.3 0.68	38 1.50
1 x 3/4	33.4 1.32	26.7 1.05	51 2.00
1 x 1/2	33.4 1.32	21.3 0.84	51 2.00
1-1/4 x 1	42.2 1.66	33.4 1.32	51 2.00
1-1/4 x 3/4	42.2 1.66	26.7 1.05	51 2.00
1-1/4 x 1/2	42.2 1.66	21.3 0.84	51 2.00
1-1/2 x 1-1/4	48.3 1.90	42.2 1.66	64 2.50
1-1/2 x 1	48.3 1.90	33.4 1.32	64 2.50
1-1/2 x 3/4	48.3 1.90	26.7 1.05	64 2.50
1-1/2 x 1/2	48.3 1.90	21.3 0.84	64 2.50
2 x 1-1/2	60.3 2.38	48.3 1.90	76 3.00
2 x 1-1/4	60.3 2.38	42.2 1.66	76 3.00
2 x 1	60.3 2.38	33.4 1.32	76 3.00
2 x 3/4	60.3 2.38	26.7 1.05	76 3.00
2-1/2 x 2	73.0 2.88	60.3 2.38	89 3.50
2-1/2 x 1-1/2	73.0 2.88	48.3 1.90	89 3.50
2-1/2 x 1-1/4	73.0 2.88	42.2 1.66	89 3.50
2-1/2 x 1	73.0 2.88	33.4 1.32	89 3.50
3 x 2-1/2	88.9 3.50	73.0 2.88	89 3.50
3 x 2	88.9 3.50	60.3 2.38	89 3.50
3 x 1-1/2	88.9 3.50	48.3 1.90	89 3.50
3 x 1-1/4	88.9 3.50	42.2 1.66	89 3.50
3-1/2 x 3	101.6 4.00	88.9 3.50	102 4.00
3-1/2 x 2-1/2	101.6 4.00	73.0 2.88	102 4.00
3-1/2 x 2	101.6 4.00	60.3 2.38	102 4.00
3-1/2 x 1-1/2	101.6 4.00	48.3 1.90	102 4.00
3-1/2 x 1-1/4	101.6 4.00	42.2 1.66	102 4.00
4 x 3-1/2	114.3 4.50	101.6 4.00	102 4.00
4 x 3	114.3 4.50	88.9 3.50	102 4.00
4 x 2-1/2	114.3 4.50	73.0 2.88	102 4.00
4 x 2	114.3 4.50	60.3 2.38	102 4.00
4 x 1-1/2	114.3 4.50	48.3 1.90	102 4.00
5 x 4	141.3 5.56	114.3 4.50	127 5.00
5 x 3-1/2	141.3 5.56	101.6 4.00	127 5.00
5 x 3	141.3 5.56	88.9 3.50	127 5.00
5 x 2-1/2	141.3 5.56	73.0 2.88	127 5.00
5 x 2	141.3 5.56	60.3 2.38	127 5.00
6 x 5	168.3 6.62	141.3 5.56	140 5.50
6 x 4	168.3 6.62	114.3 4.50	140 5.50
6 x 3-1/2	168.3 6.62	101.6 4.00	140 5.50
6 x 3	168.3 6.62	88.9 3.50	140 5.50
6 x 2-1/2	168.3 6.62	73.0 2.88	140 5.50
8 x 6	219.1 8.62	168.3 6.62	152 6.00
8 x 5	219.1 8.62	141.3 5.56	152 6.00
8 x 4	219.1 8.62	114.3 4.50	152 6.00
8 x 3-1/2	219.1 8.62	101.6 4.00	152 6.00
10 x 8	273.0 10.75	219.1 8.62	178 7.00
10 x 6	273.0 10.75	168.3 6.62	178 7.00
10 x 5	273.0 10.75	141.3 5.56	178 7.00
10 x 4	273.0 10.75	114.3 4.50	178 7.00
12 x 10	323.8 12.75	273.0 10.75	203 8.00
12 x 8	323.8 12.75	219.1 8.62	203 8.00
12 x 6	323.8 12.75	168.3 6.62	203 8.00
12 x 5	323.8 12.75	141.3 5.56	203 8.00
14 x 12	355.6 14.00	323.8 12.75	330 13.00
14 x 10	355.6 14.00	273.0 10.75	330 13.00
14 x 8	355.6 14.00	219.1 8.62	330 13.00
14 x 6	355.6 14.00	168.3 6.62	330 13.00
16 x 14	406.4 16.00	355.6 14.00	356 14.00
16 x 12	406.4 16.00	323.8 12.75	356 14.00
16 x 10	406.4 16.00	273.0 10.75	356 14.00
16 x 8	406.4 16.00	219.1 8.62	356 14.00
18 x 16	457 18.00	406.4 16.00	381 15.00
18 x 14	457 18.00	355.6 14.00	381 15.00
18 x 12	457 18.00	323.8 12.75	381 15.00
18 x 10	457 18.00	273.0 10.75	381 15.00
20 x 18	508 20.00	457 18.00	508 20.00
20 x 16	508 20.00	406.4 16.00	508 20.00
20 x 14	508 20.00	355.6 14.00	508 20.00
20 x 12	508 20.00	323.8 12.75	508 20.00
22 x 20	559 22.00	508 20.00	508 20.00
22 x 18	559 22.00	457 18.00	508 20.00
22 x 16	559 22.00	406.4 16.00	508 20.00
22 x 14	559 22.00	355.6 14.00	508 20.00
24 x 22	610 24.00	559 22.00	508 20.00
24 x 20	610 24.00	508 20.00	508 20.00
24 x 18	610 24.00	457 18.00	508 20.00
24 x 16	610 24.00	406.4 16.00	508 20.00
26 x 24	660 26.00	610 24.00	610 24.00
26 x 22	660 26.00	559 22.00	610 24.00
26 x 20	660 26.00	508 20.00	610 24.00
26 x 18	660 26.00	457 18.00	610 24.00
28 x 26	711 28.00	660 26.00	610 24.00
28 x 24	711 28.00	610 24.00	610 24.00
28 x 20	711 28.00	508 20.00	610 24.00
28 x 18	711 28.00	457 18.00	610 24.00
30 x 28	762 30.00	711 28.00	610 24.00
30 x 26	762 30.00	660 26.00	610 24.00
30 x 24	762 30.00	610 24.00	610 24.00
30 x 20	762 30.00	508 20.00	610 24.00
32 x 30	813 32.00	762 30.00	610 24.00
32 x 28	813 32.00	711 28.00	610 24.00
32 x 26	813 32.00	660 26.00	610 24.00
32 x 24	813 32.00	610 24.00	610 24.00
34 x 32	864 34.00	813 32.00	610 24.00
34 x 30	864 34.00	762 30.00	610 24.00
34 x 26	864 34.00	660 26.00	610 24.00
34 x 24	864 34.00	610 24.00	610 24.00
36 x 34	914 36.00	864 34.00	610 24.00
36 x 32	914 36.00	813 32.00	610 24.00
36 x 30	914 36.00	762 30.00	610 24.00
36 x 26	914 36.00	660 26.00	610 24.00
36 x 24	914 36.00	610 24.00	610 24.00
38 x 36	965 38.00	914 36.00	610 24.00
38 x 34	965 38.00	864 34.00	610 24.00
38 x 32	965 38.00	813 32.00	610 24.00
38 x 30	965 38.00	762 30.00	610 24.00
38 x 28	965 38.00	711 28.00	610 24.00
38 x 26	965 38.00	660 26.00	610 24.00
40 x 38	1016 40.00	965 38.00	610 24.00
40 x 36	1016 40.00	914 36.00	610 24.00
40 x 34	1016 40.00	864 34.00	610 24.00
40 x 32	1016 40.00	813 32.00	610 24.00
40 x 30	1016 40.00	762 30.00	610 24.00
42 x 40	1067 42.00	1016 40.00	610 24.00
42 x 38	1067 42.00	965 38.00	610 24.00
42 x 36	1067 42.00	914 36.00	610 24.00
42 x 34	1067 42.00	864 34.00	610 24.00
42 x 32	1067 42.00	813 32.00	610 24.00
42 x 30	1067 42.00	711 28.00	610 24.00
44 x 42	1118 44.00	1067 42.00	610 24.00
44 x 40	1118 44.00	1016 40.00	610 24.00
44 x 38	1118 44.00	965 38.00	610 24.00
44 x 36	1118 44.00	914 36.00	610 24.00
46 x 44	1168 46.00	1118 44.00	711 28.00
46 x 42	1168 46.00	1067 42.00	711 28.00
46 x 40	1168 46.00	1016 40.00	711 28.00
46 x 38	1168 46.00	965 38.00	711 28.00
48 x 46	1219 48.00	1168 46.00	711 28.00
48 x 44	1219 48.00	1118 44.00	711 28.00
48 x 42	1219 48.00	1067 42.00	711 28.00
48 x 40	1219 48.00	1016 40.00	711 28.00

*NPS: Nominal Pipe Size; O.D L: Outside Diameter at Bevel, large end; O.D S: Outside Diameter at Bevel, small end; H: Center-to-End.

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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