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Pipe Reducer – Concentric and Eccentric

Pipe Reducer – Concentric and Eccentric

Pipe-Reducer-Concentric-and-Eccentric.jpg

Taurus 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 ReducerWeld ReducerButt Welding Reducer
Out Diameter1/2″ ~ 24″4″ ~ 24″12″ ~ 78″
Wall Thickness3 mm ~ 150 mm
Product TypeConcentric 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 DiameterOutside DiameterEnd to End
D1*D2
DNNPSSeries ASerices BH
20×153/4×1/226.9×21.325×1838
20×103/4×3/826.9×17.325×1438
25×201×3/433.7×26.932×2551
25×151×1/233.7×21.332×1851
32×251.1/4×142.4×33.738×3251
32×201.1/4×3/442.4×26.938×2551
32×151.1/4×1/242.4×21.338×1851
40×321.1/2×1.1/448.3×42.445×3864
40×251.1/2×148.3×33.745×3264
40×201.1/2×3/448.3×26.945×2564
40×151.1/2×1/248.3×21.345×1864
50×402×1.1/260.3×48.357×4576
50×322×1.1/460.3×42.457×3876
50×252×160.3×33.757×3276
50×202×3/460.3×26.957×2576
65×502.1/2×273.0×60.376×5789
65×402.1/2×1.1/273.0×48.376×4589
65×322.1/2×1.1/473.0×42.476×3889
65×252.1/2×173.0×33.776×3289
80×653×2.1/288.9×73.089×7689
80×503×288.9×60.389×5789
80×403×1.1/288.9×48.389×4589
80×323×1.1/488.9×42.489×3889
90×803.1/2×3101.6×88.9102
90×653.1/2×2.1/2101.6×73.0102
90×503.1/2×2101.6×60.3102
90×403.1/2×1.1/2101.6×48.3102
90×323.1/2×1.1/4101.6×42.4102
100×904×3.1/2114.3×101.6102
100×804×3114.3×88.9108×89102
100×654×2.1/2114.3×73.0108×76102
100×504×2114.3×60.3108×57102
100×404×1.1/2114.3×48.3108×45102
125×1005×4141.3×114.3133×108127
125×905×3.1/2141.3×101.6127
125×805×3141.3×88.9133×89127
125×655×2.1/2141.3×73.0133×76127
125×505×2141.3×60.3133×57127
150×1256×5168.3×141.3159×133140
150×1006×5168.3×114.3159×108140
150×906×3.1/2168.3×101.6140
150×806×3168.3×88.9159×89140
150×656×2.1/2168.3×73.0159×76140
200×1508×6219.1×168.3219×159152
200×1258×5219.1×141.3219×133152
200×1008×4219.1×114.3219×108152
200×908×3.1/2219.1×101.6152
250×20010×8273.0×219.1273×219178
250×15010×6273.0×168.3273×159178
250×12510×5273.0×141.3273×133178
250×10010×4273.0×114.3273×108178
300×25012×10323.9×273.1325×273203
300×20012×8323.9×219.1325×219203
300×15012×6323.9×168.3325×159203
300×12512×5323.9×141.3325×133203
350×30014×12355.6×323.9377×325330
350×25014×10355.6×273.0377×273330
350×20014×8355.6×219.1377×219330
350×15014×6355.6×168.3377×159330
400×35016×14406.4×355.6426×377356
400×30016×12406.4×323.9426×325356
400×25016×10406.4×273.0426×273356
400×20016×8406.4×219.1426×219356
450×40018×16457×406.4478×426381
450×35018×14457×355.6478×377381
450×30018×12457×323.9478×325381
450×25018×10457×273.0478×273381
500×45020×18508×457529×478508
500×40020×16508×406.4529×426508
500×35020×14508×355.6529×377508
500×30020×12508×323.9529×325508
550×50022×20559×508508
550×45022×18559×457508
550×40022×16559×406.4508
550×35022×14559×355.6508
600×55024×22610×559508
600×50024×20610×508630×529508
600×45024×18610×457630×478508
600×40024×22610×406.4630×426508
650×60026×24660×610610
650×55026×22660×559610
650×50026×20660×508610
650×45026×18660×457610
700×65028×26711×660610
700×60028×24711×610720×630610
700×55028×22711×559610
700×50028×20711×508720×530610
750×70030×28762×711610
750×65030×26762×660610
750×60030×24762×610610
750×55030×22762×559610
800×75032×30813×762610
800×70032×28813×711820×720610
800×65032×26813×660610
800×60032×24813×610820×630610
850×80034×32864×813610
850×75034×30864×762610
850×70034×28864×711610
850×65034×26864×660610
900×85036×34914×864610
900×80036×32914×813920×820610
900×75036×30914×762610
900×70036×28914×711920×720610
950×90038×36965×914610
950×85038×34965×864610
950×80038×32965×813610
950×75038×30965×762610
1000×95040×381016×965610
1000×90040×361016×9141020×920610
1000×85040×341016×864610
1000×80040×321016×8131020×820610
1050×100042×401067×1016610
1050×95042×381067×965610
1050×90042×361067×914610
1050×85042×341067×864610
1100×105044×421118×1067610
1100×100044×401118×10161120×1020610
1100×95044×381118×965610
1100×90044×361118×9141220×920610
1150×110046×441168×1118711
1150×105046×421168×1067711
1150×100046×401168×1016711
1150×95046×381168×965711
1200×115048×461220×1168711
1200×110048×441220×11181220×1120711
1200×105048×421220×1067711
1200×100048×401220×10161220×1020711

 

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):


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