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ASME B16.9 Butt Weld Eccentric Reducer

The butt welded eccentric reducer is a pipe fitting used to connect pipes of different diameters, and its central axes do not overlap, and there is an eccentricity.

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The butt welded eccentric reducer is a pipe fitting used to connect pipes of different diameters, and its central axes do not overlap, and there is an eccentricity. It plays the role of changing the diameter and flow direction in the pipeline system, and is usually used in places where the pipe diameter needs to be adjusted and adapted to different installation spaces or process requirements.

It consists of a large end and a small end. The large end is connected to the pipe with a larger diameter, and the small end is connected to the pipe with a smaller diameter. In terms of manufacturing technology, it is generally formed by forging or stamping, and then the two ends are processed by butt welding to ensure the sealing and firmness of the connection with the pipeline.

Specification of Eccentric Reducer

Size Range 3/4″ – 60″ / DN20 – 1500
Thickness Schedule SCH 10 – SCH 80, SCH 160, XXS
America Standard ANSI / ASME B16.9 / MSS SP 43
Japan Standard JIS B2311/2312/2313
Germany Standard DIN2605/2615/2616/2617
Europe Standard EN10253
Carbon Steel Q235, 20#, 35#, 45#, 20G,ASTM A234 WPB/WPC
Low Temp Carbon Steel Q345B, 16Mn, ASTM A420 WPL6
Pipeline Steel ASTM A860 WPHY 42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A234 WP11 / WP12 / WP 5 / WP9 / WP91 / WP92,

15CrMoG, 12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5

Stainless Steel ASTM A403 WP304/304L/304H, 316/316L, 310S, 317, 347, 904L
Dual Phase Stainless Steel A815 WPS32205/32750/31803/32760

Butt Weld Reducer Weight Chart

The weight chart is available in concentric and eccentric reducer which based on the ASME / ANSI B16.9 . The weight for the size more than DN1200 (NPS 48) is calculated on the basis of thickness 9.53mm.

Nominal Size SCH20 STD SCH40 SCH80 SCH120 SCH160
DN NPS
15 1/2 0.08 0.08 0.1
20 3/4 0.17 0.17 0.2
25 1 0.21 0.21 0.25 0.22
32 1 1/4 0.29 0.29 0.35
40 1 1/2 0.42 0.42 0.58 0.6
50 2 0.8 0.8 1.03 1.04
65 2 1/2 1.05 1.05 1.42 1.65
80 3 1.36 1.36 1.9
90 3 1/2 1.63 1.63 2.27 2.4
100 4 2.77 2.77 3.93 4.4
125 5 3.96 3.96 6 7.14
150 6 6.31 6.31 9.26 10.8
200 8 7.85 10.7 10.7 17.5 15 18.4
250 10 11.2 15.8 16.3 25.1 25.1 32.5
300 12 25.6 28.8 32.1 56.5 41.7 53.3
350 14 30.5 38.5 48.8 79 84.5 106
400 16 35.2 44.5 64.3 102 112 143
450 18 62.7 62.7 98.5 165
500 20 72.6 72.6 181
550 22 97 79.1 142 226
600 24 130 100

How to inspect the Eccentric Reducer

We are very strict in the inspection of reducers. First, we check whether there are defects such as cracks and heavy skin on the appearance. These defects may affect its strength and sealing performance. Then, according to the provisions of the standard ASME B16.9, we check whether the dimensions of the eccentric reducer meet the requirements, including the large end diameter, small end diameter, wall thickness, etc. In addition, we also measure the tensile strength and yield strength of the eccentric reducer through tensile tests to verify whether its strength meets the standard requirements.

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