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Concentric Reducer

Size: 1/2"-48"
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, ASME B16.28, MSS SP43, MSS SP75

INQUIRY
  • PRODUCT DETAIL
  • Material

Size: 1/2″-48″
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, ASME B16.28, MSS SP43, MSS SP75

Concentric reducer

Concentric reducer is a kind of fitting that be used for reducing piping size. Concentric reducer is most commonly used and often eccentric reducer used in piping in about pump and pipe rack area.

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).

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):
top flat and bottom flat reducers - Concentric Reducer

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):

Cold Forming

buttweld reducer manufacturing process - Concentric Reducer

Welding Method

20190901065626 86794 - Concentric Reducer

Source: TK Bend

Weights of Buttweld Reducers

Weights Reducers Concentric and Eccentric schedule STD

reducer con ecc weight - Concentric Reducer
NPS LBS KG
3/4-1/2 0.17 0.08
3/4-3/8 0.15 0.07
1-3/4 0.4 0.18
1-1/2 0.4 0.18
1.1/4-1 0.5 0.23
1.1/4-3/4 0.4 0.18
1.1/4-1/2 0.4 0.18
1.1/2-1.1/4 0.7 0.32
1.1/2-1 0.62 0.28
1.1/2-3/4 0.54 0.24
1.1/2-1/2 0.5 0.23
2-1.1/2 0.9 0.41
2-1.1/4 0.84 0.38
2-1 0.76 0.34
2-3/4 0.7 0.32
2.1/2-2 1.5 0.68
2.1/2-1.1/2 1.38 0.63
2.1/2-1.1/4 1.25 0.57
2.1/2-1 1.25 0.57
3-2.1/2 2 0.91
3-2 1.8 0.82
3-1.1/2 1.7 0.77
3-1.1/4 1.6 0.73
3.1/2-3 3.15 1.43
3.1/2-2.1/2 2.88 1.31
3.1/2-2 2.75 1.25
3.1/2-1.1/2 2.5 1.13
3.1/2-1.1/4 2.4 1.09
4-3.1/2 3.5 1.59
4-3 3.38 1.53
4-2.1/2 3.25 1.47
4-2 3 1.36
4-1.1/2 2.88 1.31
5-4 6 2.72
5-3.1/2 5.75 2.61
5-3 5.5 2.49
5-2.1/2 5.25 2.38
5-2 5 2.27
6-5 8.5 3.86
6-4 8.25 3.74
6-3.1/2 8.25 3.74
6-3 8 3.63
6-2.1/2 7.25 3.29
8-6 13.2 5.99
8-5 12 5.44
8-4 11 4.99
8-3.1/2 11 4.99
10-8 22 9.98
10-6 21.5 9.75
10-5 21 9.53
10-4 20 9.07
12-10 34 15.42
12-8 32 14.51
12-6 31 14.06
12-5 30 13.61
14-12 60 27.22
14-10 59.2 26.85
14-8 58.5 26.54
14-6 58 26.31
16-14 71 32.21
16-12 70 31.75
16-10 69.5 31.52
16-8 68.5 31.07
16-6 – –
18-16 85 38.56
18-14 84 38.1
18-12 83 37.65
18-10 82 37.19
18-8 – –
20-18 125 56.7
20-16 124 56.25
20-14 122 55.34
20-12 120 54.43
20-10 – –
20-8 – –
22-20 142 64.41
22-18 138 62.6
22-16 131 59.42
22-14 123 55.79
22-12 – –
22-10 – –
24-22 – –
24-20 150 68.04
24-18 148 67.13
24-16 145 65.77
24-14 – –
24-12 – –
24-10 – –
26-24 207 93.89
26-22 200 90.72
26-20 190 86.18
26-18 182 82.55
26-16 – –
26-14 – –
26-12 – –
28-26 224 101.6
28-24 216 97.98
28-22 210 95.25
28-20 199 90.26
30-28 241 109.32
30-26 232 105.23
30-24 224 101.6
30-22 220 99.79
30-20 220 99.79
NPS LBS KG

Note:

  • All weights are in pounds and kilograms and approximated or estimated.

Weights Reducers Concentric and Eccentric schedule XS

reducer con ecc weight - Concentric Reducer
NPS LBS KG
3/4-1/2 0.22 0.1
3/4-3/8 0.2 0.09
1-3/4 0.45 0.2
1-1/2 0.45 0.2
1.1/4-1 0.5 0.23
1.1/4-3/4 0.5 0.23
1.1/4-1/2 0.5 0.23
1.1/2-1.1/4 0.78 0.35
1.1/2-1 0.75 0.34
1.1/2-3/4 0.7 0.32
1.1/2-1/2 0.65 0.29
2-1.1/2 1.2 0.54
2-1.1/4 1.15 0.52
2-1 1.1 0.5
2-3/4 1 0.45
2.1/2-2 2 0.91
2.1/2-1.1/2 1.9 0.86
2.1/2-1.1/4 1.85 0.84
2.1/2-1 1.75 0.79
3-2.1/2 2.75 1.25
3-2 2.6 1.18
3-1.1/2 2.5 1.13
3-1.1/4 2.4 1.09
3.1/2-3 4 1.81
3.1/2-2.1/2 3.5 1.59
3.1/2-2 3.5 1.59
3.1/2-1.1/2 3.25 1.47
3.1/2-1.1/4 3.25 1.47
4-3.1/2 4.75 2.15
4-3 4.5 2.04
4-2.1/2 4.38 1.99
4-2 4.25 1.93
4-1.1/2 4 1.81
5-4 8.25 3.74
5-3.1/2 7.75 3.52
5-3 7.5 3.4
5-2.1/2 7 3.18
5-2 6.5 2.95
6-5 12 5.44
6-4 11.5 5.22
6-3.1/2 11 4.99
6-3 10.5 4.76
6-2.1/2 10 4.54
8-6 18.7 8.48
8-5 18 8.16
8-4 17 7.71
8-3.1/2 16.5 7.48
10-8 29.5 13.38
10-6 29.5 13.38
10-5 28 12.7
10-4 25.5 11.57
12-10 43.5 19.73
12-8 42 19.05
12-6 40 18.14
12-5 39 17.69
14-12 80 36.29
14-10 79.2 35.92
14-8 78.5 35.61
14-6 78 35.38
16-14 91 41.28
16-12 90 40.82
16-10 89 40.37
16-8 88.5 40.14
16-6 – –
18-16 115 52.16
18-14 114 51.71
18-12 113 51.26
18-10 112 50.8
18-8 – –
20-18 170 77.11
20-16 169 76.66
20-14 168 76.2
20-12 167 75.75
20-10 – –
20-8 – –
22-20 186 84.37
22-18 182 82.55
22-16 173 78.47
22-14 163 73.94
22-12 – –
22-10 – –
24-22 – –
24-20 200 90.72
24-18 195 88.45
24-16 190 86.18
24-14 – –
24-12 – –
24-10 – –
26-24 276 125.19
26-22 272 123.38
26-20 253 114.76
26-18 242 109.77
26-16 – –
26-14 – –
26-12 – –
28-26 299 135.62
28-24 288 130.63
28-22 250 113.4
28-20 264 119.75
30-28 322 146.06
30-26 310 140.61
30-24 299 135.62
30-22 285 129.27
30-20 274 124.28
NPS LBS KG

Note:

  • All weights are in pounds and kilograms and approximated or estimated.

WEIGHTS REDUCERS CONCENTRIC/ECCENTRIC SCHEDULE 160

reducer con ecc weight - Concentric Reducer
NPS LBS KG
3/4-1/2 0.28 0.13
3/4-3/8 0.24 0.11
1-3/4 0.5 0.23
1-1/2 0.5 0.23
1.1/4-1 0.65 0.29
1.1/4-3/4 0.65 0.29
1.1/4-1/2 0.6 0.27
1.1/2-1.1/4 0.95 0.43
1.1/2-1 0.8 0.36
1.1/2-3/4 0.75 0.34
1.1/2-1/2 0.73 0.33
2-1.1/2 1.6 0.73
2-1.1/4 1.5 0.68
2-1 1.5 0.68
2-3/4 1.45 0.66
2.1/2-2 2.5 1.13
2.1/2-1.1/2 2.25 1.02
2.1/2-1.1/4 2.25 1.02
2.1/2-1 2.2 1
3-2.1/2 3.7 1.68
3-2 3.4 1.54
3-1.1/2 3.2 1.45
3-1.1/4 3.1 1.41
3.1/2-3 – –
3.1/2-2.1/2 – –
3.1/2-2 – –
3.1/2-1.1/2 – –
3.1/2-1.1/4 – –
4-3.1/2 – –
4-3 6.4 2.9
4-2.1/2 5.5 2.49
4-2 5.4 2.45
4-1.1/2 5.25 2.38
5-4 12.5 5.67
5-3.1/2 – –
5-3 11 4.99
5-2.1/2 10.5 4.76
5-2 10 4.54
6-5 18.75 8.5
6-4 16.5 7.48
6-3.1/2 – –
6-3 15.5 7.03
6-2.1/2 15 6.8
8-6 31 14.06
8-5 27.2 12.34
8-4 23.5 10.66
8-3.1/2 – –
10-8 57.5 26.08
10-6 54 24.49
10-5 52 23.59
10-4 50 22.68
12-10 96 43.54
12-8 87 39.46
12-6 83 37.65
12-5 80 36.29
NPS LBS KG

Note:

  • All weights are in pounds and kilograms and approximated or estimated.

WEIGHTS REDUCERS CONCENTRIC/ECCENTRIC SCHEDULE XXS

reducer con ecc weight - Concentric Reducer
NPS LBS KG
1-3/4 0.8 0.36
1-1/2 0.75 0.34
1.1/4-1 1 0.45
1.1/4-3/4 1 0.45
1.1/4-1/2 1 0.45
1.1/2-1.1/4 1.5 0.68
1.1/2-1 1.5 0.68
1.1/2-3/4 1.38 0.63
1.1/2-1/2 1.25 0.57
2-1.1/2 2.38 1.08
2-1.1/4 2.25 1.02
2-1 2.15 0.98
2-3/4 2 0.91
2.1/2-2 4 1.81
2.1/2-1.1/2 3.9 1.77
2.1/2-1.1/4 3.6 1.63
2.1/2-1 3.5 1.59
3-2.1/2 6 2.72
3-2 5 2.27
3-1.1/2 4.9 2.22
3-1.1/4 4.75 2.15
3.1/2-3 8 3.63
3.1/2-2.1/2 8 3.63
3.1/2-2 7 3.18
3.1/2-1.1/2 7 3.18
3.1/2-1.1/4 7 3.18
4-3.1/2 9 4.08
4-3 9 4.08
4-2.1/2 8.5 3.86
4-2 8.25 3.74
4-1.1/2 8 3.63
5-4 16 7.26
5-3.1/2 15 6.8
5-3 14.5 6.58
5-2.1/2 13.75 6.24
5-2 14 6.35
6-5 23 10.43
6-4 22 9.98
6-3.1/2 21 9.53
6-3 20 9.07
6-2.1/2 19 8.62
8-6 36 16.33
8-5 35 15.88
8-4 33 14.97
8-3.1/2 32 14.51
NPS LBS KG

Note:

  • All weights are in pounds and kilograms and approximated or estimated.

Source: wermac.org

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Fitting Dimension Tolerance - Concentric Reducer

Material

Special Alloys

  • HASTELLOY® X
  • MONEL® R-405
  • MONEL® K-500
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 825
  • INCOLOY® 800H / 800HT®
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • MONEL® ALLOY 400

ALLOY 20

  • NICKEL 200/201
  • MONEL® R-405
  • MONEL® K-500
  • MONEL® ALLOY 400
  • INCONEL® 718
  • INCONEL® ALLOY 625
  • INCONEL® ALLOY 601
  • INCONEL® ALLOY 600
  • INCOLOY® 825
  • HASTELLOY® X
  • HASTELLOY® C-276
  • HASTELLOY® C-22
  • HASTELLOY® B-2
  • INCOLOY® 800H / 800HT®
  • HASTELLOY® B-3

Duplex Stainless Steel

  • ZERON® 100, SUPER DUPLEX STAINLESS STEEL
  • Super Duplex S32760
  • LDX 2101®, DUPLEX STEEL
  • Duplex S31803
  • SUPER DUPLEX 2507
  • DUPLEX 2205

Stainless Steel

  • STAINLESS STEEL NITRONIC 50HS
  • STAINLESS STEEL NITRONIC 60
  • STAINLESS STEEL NITRONIC 50
  • STAINLESS STEEL 13-8PH
  • STAINLESS STEEL 15-5PH
  • STAINLESS STEEL PRODEC 303
  • STAINLESS STEEL 303
  • STAINLESS STEEL 446
  • STAINLESS STEEL 410S
  • STAINLESS STEEL 410
  • STAINLESS STEEL 304-304H
  • STAINLESS STEEL 17-4
  • STAINLESS STEEL 347
  • STAINLESS STEEL 440C
  • STAINLESS STEEL 309
  • STAINLESS STEEL 316-316l
  • STAINLESS STEEL AL-6XN®
  • STAINLESS STEEL 330
  • STAINLESS STEEL 321
  • 317L STAINLESS STEEL
  • STAINLESS STEEL 310/310S
  • Stainless Steel 304L
  • Stainless Steel 304
  • STAINLESS STEEL 253 MA

Carbon Steel

  • CARBON STEEL PRODUCTS

Titanium

  • 10V-2Fe-3Al
  • 6Al-4V
  • 6Al-4V STA
  • 6Al-4V ELI
  • 6Al-2Sn-4Zr-2Mo

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