Pipe Reducer – Concentric and Eccentric

Abter company carries a wide range of concentric and eccentric reducers.

Dimensional tolerances conform to ASME B16.9. Fitting wall thicknesses conform with standard schedule SCH10，SCH20，SCH30，STD,SCH40，SCH60，SCH80，SCH100，SCH120，SCH160 and ASME B36.19M wall pipe.

Butt welding fittings are permanently marked by electro-chemical etching in accordance with ASME B16.9. Estimated fitting weights are based on a density of .163 lbs/cubic inch.

A steel pipe reducer is the component in a pipeline that decreases the pipe size to a smaller bore. There are two main types of reducer: concentric and eccentric reducer. Some pipe reducers are manufactured by means of punch forming and others by bending, extruding, pushing, molding or machining.

The steel pipe reducer is used when liquid flow increases or decreases in small quantities. In order to prevent cavitation, it is also used to connect to the inlet hole of pump. Besides, it is also useful to connect joints in instrument like flow meter and control valve. The steel reducer also finds applications in sugar mills and distilleries, pumps, petrochemical, cement and construction industries and steel plants. It can be stored in fumigation-free boxes or wooden holders.

Raw Materials
* A234 – WPB WP5, WP9, WP11, WP22
* A420 – WPL3/ WPL6
* A403 – WP304/L; WP316/L
* A860-WPHY 42-46/52-60/65-70
Special Materials such as Monel, Inconel, Cu-Ni, Duplex SS etc are available on request

Specifications of the Steel Pipe Reducer

	Type
	Seamless Reducer	Weld Reducer	Butt Welding Reducer
Out Diameter	1/2″ ～ 24″	4″ ～ 24″	12″ ～ 78″
Wall Thickness	3 mm ～ 150 mm
Product Type	Concentric reducer, eccentric reducer

Standard Available
Our company provides steel pipe reducers of different standards to meet requirements of customers.
GB/T12459-2005 GB/T13401-2005 GB/T10752-2005
SH/T3408-1996 SH/T3409-1996
SY/T0518-2002 SY/T0510-1998
DL/T695-1999 GD2000 GD87-1101
HG/T21635-1987 HG/T21631-1990
ASME B16.9-2007 ASME B16.25-2007
MSS SP 75-2008
CSA Z245.11-05-2005
EN10253-1-1999 EN10253-2-2007 EN10253-3-2008 EN10253-4-2008
DIN2605-1-1992 DIN2605-2-1995
BS1640-1-1962 BS1640-2-1962 BS1640-3-1968 BS1640-4-1968 BS1965-1-1963
AFNOR NF A 49-289-1990 AFNOR NF A 49-170-1-1999 AFNOR NF A 49-170-2-2009 AFNOR NF A 49-170-3-2009 AFNOR NF A 49-170-4-2009
ISO3419-1981 ISO5251-1981
JIS B2311-2009 JIS B2312-2009 JIS B2313-2009

buttweld-Reducer

Nominal Diameter		Outside Diameter		End to End
Nominal Diameter		D1*D2		End to End
DN	NPS	Series A	Serices B	H
20×15	3/4×1/2	26.9×21.3	25×18	38
20×10	3/4×3/8	26.9×17.3	25×14	38
25×20	1×3/4	33.7×26.9	32×25	51
25×15	1×1/2	33.7×21.3	32×18	51
32×25	1.1/4×1	42.4×33.7	38×32	51
32×20	1.1/4×3/4	42.4×26.9	38×25	51
32×15	1.1/4×1/2	42.4×21.3	38×18	51
40×32	1.1/2×1.1/4	48.3×42.4	45×38	64
40×25	1.1/2×1	48.3×33.7	45×32	64
40×20	1.1/2×3/4	48.3×26.9	45×25	64
40×15	1.1/2×1/2	48.3×21.3	45×18	64
50×40	2×1.1/2	60.3×48.3	57×45	76
50×32	2×1.1/4	60.3×42.4	57×38	76
50×25	2×1	60.3×33.7	57×32	76
50×20	2×3/4	60.3×26.9	57×25	76
65×50	2.1/2×2	73.0×60.3	76×57	89
65×40	2.1/2×1.1/2	73.0×48.3	76×45	89
65×32	2.1/2×1.1/4	73.0×42.4	76×38	89
65×25	2.1/2×1	73.0×33.7	76×32	89
80×65	3×2.1/2	88.9×73.0	89×76	89
80×50	3×2	88.9×60.3	89×57	89
80×40	3×1.1/2	88.9×48.3	89×45	89
80×32	3×1.1/4	88.9×42.4	89×38	89
90×80	3.1/2×3	101.6×88.9	–	102
90×65	3.1/2×2.1/2	101.6×73.0	–	102
90×50	3.1/2×2	101.6×60.3	–	102
90×40	3.1/2×1.1/2	101.6×48.3	–	102
90×32	3.1/2×1.1/4	101.6×42.4	–	102
100×90	4×3.1/2	114.3×101.6	–	102
100×80	4×3	114.3×88.9	108×89	102
100×65	4×2.1/2	114.3×73.0	108×76	102
100×50	4×2	114.3×60.3	108×57	102
100×40	4×1.1/2	114.3×48.3	108×45	102
125×100	5×4	141.3×114.3	133×108	127
125×90	5×3.1/2	141.3×101.6	–	127
125×80	5×3	141.3×88.9	133×89	127
125×65	5×2.1/2	141.3×73.0	133×76	127
125×50	5×2	141.3×60.3	133×57	127
150×125	6×5	168.3×141.3	159×133	140
150×100	6×5	168.3×114.3	159×108	140
150×90	6×3.1/2	168.3×101.6	–	140
150×80	6×3	168.3×88.9	159×89	140
150×65	6×2.1/2	168.3×73.0	159×76	140
200×150	8×6	219.1×168.3	219×159	152
200×125	8×5	219.1×141.3	219×133	152
200×100	8×4	219.1×114.3	219×108	152
200×90	8×3.1/2	219.1×101.6	–	152
250×200	10×8	273.0×219.1	273×219	178
250×150	10×6	273.0×168.3	273×159	178
250×125	10×5	273.0×141.3	273×133	178
250×100	10×4	273.0×114.3	273×108	178
300×250	12×10	323.9×273.1	325×273	203
300×200	12×8	323.9×219.1	325×219	203
300×150	12×6	323.9×168.3	325×159	203
300×125	12×5	323.9×141.3	325×133	203
350×300	14×12	355.6×323.9	377×325	330
350×250	14×10	355.6×273.0	377×273	330
350×200	14×8	355.6×219.1	377×219	330
350×150	14×6	355.6×168.3	377×159	330
400×350	16×14	406.4×355.6	426×377	356
400×300	16×12	406.4×323.9	426×325	356
400×250	16×10	406.4×273.0	426×273	356
400×200	16×8	406.4×219.1	426×219	356
450×400	18×16	457×406.4	478×426	381
450×350	18×14	457×355.6	478×377	381
450×300	18×12	457×323.9	478×325	381
450×250	18×10	457×273.0	478×273	381
500×450	20×18	508×457	529×478	508
500×400	20×16	508×406.4	529×426	508
500×350	20×14	508×355.6	529×377	508
500×300	20×12	508×323.9	529×325	508
550×500	22×20	559×508	–	508
550×450	22×18	559×457	–	508
550×400	22×16	559×406.4	–	508
550×350	22×14	559×355.6	–	508
600×550	24×22	610×559	–	508
600×500	24×20	610×508	630×529	508
600×450	24×18	610×457	630×478	508
600×400	24×22	610×406.4	630×426	508
650×600	26×24	660×610	–	610
650×550	26×22	660×559	–	610
650×500	26×20	660×508	–	610
650×450	26×18	660×457	–	610
700×650	28×26	711×660	–	610
700×600	28×24	711×610	720×630	610
700×550	28×22	711×559	–	610
700×500	28×20	711×508	720×530	610
750×700	30×28	762×711	–	610
750×650	30×26	762×660	–	610
750×600	30×24	762×610	–	610
750×550	30×22	762×559	–	610
800×750	32×30	813×762	–	610
800×700	32×28	813×711	820×720	610
800×650	32×26	813×660	–	610
800×600	32×24	813×610	820×630	610
850×800	34×32	864×813	–	610
850×750	34×30	864×762	–	610
850×700	34×28	864×711	–	610
850×650	34×26	864×660	–	610
900×850	36×34	914×864	–	610
900×800	36×32	914×813	920×820	610
900×750	36×30	914×762	–	610
900×700	36×28	914×711	920×720	610
950×900	38×36	965×914	–	610
950×850	38×34	965×864	–	610
950×800	38×32	965×813	–	610
950×750	38×30	965×762	–	610
1000×950	40×38	1016×965	–	610
1000×900	40×36	1016×914	1020×920	610
1000×850	40×34	1016×864	–	610
1000×800	40×32	1016×813	1020×820	610
1050×1000	42×40	1067×1016	–	610
1050×950	42×38	1067×965	–	610
1050×900	42×36	1067×914	–	610
1050×850	42×34	1067×864	–	610
1100×1050	44×42	1118×1067	–	610
1100×1000	44×40	1118×1016	1120×1020	610
1100×950	44×38	1118×965	–	610
1100×900	44×36	1118×914	1220×920	610
1150×1100	46×44	1168×1118	–	711
1150×1050	46×42	1168×1067	–	711
1150×1000	46×40	1168×1016	–	711
1150×950	46×38	1168×965	–	711
1200×1150	48×46	1220×1168	–	711
1200×1100	48×44	1220×1118	1220×1120	711
1200×1050	48×42	1220×1067	–	711
1200×1000	48×40	1220×1016	1220×1020	711

What’s the difference between CONCENTRIC REDUCER and ECCENTRIC REDUCER ?

CONCENTRIC REDUCER

The open ends of a concentric reducer are aligned and centered one to the other. Generally, this type of pipe reducer is used to modify the bore size of the pipeline by two (maximum three) measures, to avoid an excessive pressure drop in the pipeline.

If a larger reduction is needed, then a sequence of reducers shall be used to have a smooth and gradual adjustment of the pipeline bore size (vs. a drastic change).

For small bore size reductions, reducing flanges may be an alternative to buttweld reducers.

ECCENTRIC REDUCERThe open ends of an eccentric reducer are in an “offset” position one to the other.

Eccentric reducers are used, generally, for pipelines installed in a horizontal position (whereas concentric reducers are used for pipelines installed vertically or for the inlets of suction pumps, as top flat eccentric reducers).

PIPE REDUCERS MANUFACTURING PROCESS

Eccentric reducers can be top flat (“TF”) or bottom flat (“BF”).

The bottom flat eccentric reducer type is used for pipe-racks (the bottom of the reducer is flat and at the same level of the bigger sized run pipe), while the top flat pipe reducer type is used at the inlet of piping suction pumps as shown in the image below (this setup prevents the formation of vapor traps in the pipeline):

CONCENTRIC VS ECCENTRIC REDUCER

The key difference between concentric vs eccentric reducer is the centricity of the inlet vs. the outlet of the fitting, which is perfect for a concentric reducer and offset of an eccentric reducer.

BW REDUCER MANUFACTURING PROCESS

Cold forming is the most common manufacturing process for seamless eccentric/concentric reducers (welded reducers are produced with the single or double seam weld process):