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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

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*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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