MS Buttweld 'B' Class

Eccentric Reducer

Mild Steel · ASME B16.9 · 20 sizes

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← All B Class (Medium)

MS Buttweld 'B' Class

Buttweld Eccentric Reducer

7307MSE40B201

Material: Mild Steel (IS 1239 Part 2 / IS 2062 Gr. A)
Type: Welded (ERW)
Shape: Eccentric
Schedule: Class B (Medium)
End Connection: Beveled End
Dimension Standard: ASME B16.9
Temperature: -10°C to 300°C
Pressure Rating: ~42 bar (IS 1239 Class B, Medium)
HSN Code: 73079300
GST: 18%

Schematic: letters match the table columns

Illustration

7 columns · scroll sideways

SizeNPS	OD Large (D)mm	OD Small (D1)mm	Wall Large (t)mm	Wall Small (t1)mm	Length (H)mm	Offsetmm
3/4" × 1/2" NB	26.7	21.3	2.0	2.0	38	2.7
1" × 3/4" NB	33.4	26.7	2.5	2.0	51	3.3
1" × 1/2" NB	33.4	21.3	2.5	2.0	51	6.0
1-1/4" × 1" NB	42.2	33.4	3.0	2.5	51	4.4
1-1/2" × 1-1/4" NB	48.3	42.2	3.0	3.0	64	3.0
1-1/2" × 1" NB	48.3	33.4	3.0	2.5	64	7.4
2" × 1-1/2" NB	60.3	48.3	3.0	3.0	76	6.0
2" × 1-1/4" NB	60.3	42.2	3.0	3.0	76	9.0
2" × 1" NB	60.3	33.4	3.0	2.5	76	13.4
2-1/2" × 2" NB	73.0	60.3	3.5	3.0	89	6.4
3" × 2-1/2" NB	88.9	73.0	3.5	3.5	89	8.0
3" × 2" NB	88.9	60.3	3.5	3.0	89	14.3
4" × 3" NB	114.3	88.9	3.5	3.5	102	12.7
4" × 2-1/2" NB	114.3	73.0	3.5	3.5	102	20.6
5" × 4" NB	141.3	114.3	4.0	3.5	127	13.5
6" × 5" NB	168.3	141.3	4.0	4.0	140	13.5
6" × 4" NB	168.3	114.3	4.0	3.5	140	27.0
8" × 6" NB	219.1	168.3	4.5	4.0	152	25.4
10" × 8" NB	273.0	219.1	4.5	4.5	178	27.0
12" × 10" NB	323.8	273.0	4.5	4.5	203	25.4

Pricing: prices for this product are not listed. Request a quotation.

Certification: All relevant test certificates or document will be provided.
Coating: Anticorrosion Paint Charges Included and Hot Dip Galvanizing Coating (GI), Epoxy Coating Charged Extra.
Taxes & Duties: GST and any other statutory levies shall be charged extra at applicable rates.

All dimensions in millimetres. Subject to change without notice. Spotted a mistake or wrong data? Please contact us.

About the eccentric reducer

An eccentric reducer has one flat side, shifting the pipe centreline. The key fitting at pump suctions (flat side up) to prevent air pockets from forming, and in drainable horizontal lines (flat side down).

One side flat: centreline of outlet is offset from inlet centreline
Offset = (D₁ − D₂) / 2 between the two centrelines
Same overall length H as concentric reducer for the same size combination
Flat side can face up or down depending on application

Applicable Standards

Standards governing design, dimensions, and testing

ASME B16.9

Factory-Made Wrought Buttwelding Fittings

Covers the full range of industrial butt weld fittings (elbows, tees, reducers, caps, returns) in carbon steel, alloy steel, and stainless steel from ½" to 48" NB.

Applies to NPS ½" through 48" (DN 15 through DN 1200)
Schedule wall: STD / XS / XXS plus full SCH range
Radius: Long Radius (LR) 1.5D and Short Radius (SR) 1.0D elbows
Dimensional tables are the only source of 'legal' wall thickness
No pressure-temperature rating: use ASME B31.3 / B31.1 with pipe schedule
End prep: per ASME B16.25 bevel

More in B Class (Medium)

MS Buttweld 'B' Class

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