The Center point of the circle at both ends of the tube is not on the same straight line is called concentric reducers. The Concentric reducer (reducing pipe) is a pipe fitting used for the diameter of the pipe. The commonly used forming process is reducing diameter pressing, expanding diameter pressing or reducing diameter plus expanding diameter pressing, and stamping forming can also be used for reducing diameter pipes of certain specifications.
| Size | O.D at Bevel | H | Size | O.D at Bevel | H | ||
| Large End | Small End | Large End | Small End | ||||
| 3/4"x1/2" | 26.7 | 21.3 | 38 | 5x4" | 141.3 | 114.3 | 127 |
| 3/4"x3/8" | 26.7 | 17.3 | 38 | 5x3 1/2" | 141.3 | 101.6 | 127 |
| 1x3/4" | 33.4 | 16.7 | 51 | 5x3" | 141.3 | 88.9 | 127 |
| 1x1/2" | 33.4 | 21.3 | 51 | 5x2 1/2" | 141.3 | 73 | 127 |
| 1 1/4x1" | 42.2 | 33.4 | 51 | 5x2" | 141.3 | 60.3 | 127 |
| 1 1/4x3/4" | 42.2 | 26.7 | 51 | 6x5" | 168.3 | 141.3 | 140 |
| 1 1/4x1/2" | 42.2 | 21.3 | 51 | 6x4" | 168.3 | 114.3 | 140 |
| 1 1/2x1 1/4" | 48.3 | 42.2 | 64 | 6x3 1/2" | 168.3 | 101.6 | 140 |
| 1 1/2x1" | 48.3 | 33.4 | 64 | 6x3" | 168.3 | 88.9 | 140 |
| 1 1/2x3/4" | 48.3 | 26.7 | 64 | 6x2 1/2" | 168.3 | 73 | 140 |
| 1 1/2x1/2" | 48.3 | 21.3 | 64 | 8x6" | 219.1 | 168.3 | 152 |
| 2x1 1/2" | 60.3 | 48.3 | 76 | 8x5" | 219.1 | 141.3 | 152 |
| 2x1 1/4" | 60.3 | 42.2 | 76 | 8x4" | 219.1 | 114 | 152 |
| 2x1" | 60.3 | 33.4 | 76 | 8x3 1/2" | 219.1 | 101.6 | 152 |
| 2x3/4" | 60.3 | 26.7 | 76 | 10x8" | 273 | 219.1 | 178 |
| 2 1/2x2" | 73 | 60.3 | 89 | 10x6" | 273 | 168.3 | 178 |
| 2 1/2x1 1/2" | 73 | 48.3 | 89 | 10x5" | 273 | 141.3 | 178 |
| 2 1/2x1 1/4" | 73 | 42.2 | 89 | 10x4" | 273 | 114.3 | 178 |
| 2 1/2x1" | 73 | 33.4 | 89 | 12x10" | 323.8 | 273 | 203 |
| 3x2 1/2" | 88.9 | 73 | 89 | 12x8" | 323.8 | 219.1 | 203 |
| 3x2" | 88.9 | 60.3 | 89 | 12x6" | 323.8 | 168.3 | 203 |
| 3x1 1/2" | 88.9 | 48.3 | 89 | 12x5" | 323.8 | 141.3 | 203 |
| 3x1 1/4" | 88.9 | 42.2 | 89 | 14x12" | 355.6 | 323.8 | 330 |
| 3 1/2x3" | 101.6 | 88.9 | 102 | 14x10" | 355.6 | 273 | 330 |
| 3 1/2x2 1/2" | 101.6 | 73 | 102 | 14x8" | 355.6 | 219.1 | 330 |
| 3 1/2x2" | 101.6 | 60.3 | 102 | 14x6" | 355.6 | 168.3 | 330 |
| 3 1/2x1 1/2" | 101.6 | 48.3 | 102 | 16x14" | 406.4 | 355.6 | 356 |
| 3 1/2x1 1/4" | 101.6 | 42.2 | 102 | 16x12" | 406.4 | 323.8 | 356 |
| 4x3 1/2" | 114.3 | 101.6 | 102 | 16x10" | 406.4 | 273 | 356 |
| 4x3" | 114.3 | 88.9 | 102 | 16x8" | 406.4 | 219.1 | 356 |
| 4x2 1/2" | 114.3 | 73 | 102 | 18x16" | 457 | 406.4 | 381 |
| 4x2" | 114.3 | 60.3 | 102 | 18x14" | 457 | 355.6 | 381 |
| 4x1 1/2" | 114.3 | 48.3 | 102 | 18x12" | 457 | 323.8 | 381 |
| 18x10" | 457 | 273 | 381 | ||||
Both eccentric reducer black paint and stainless steel eccentric reducer manufacture standards can be ASME B16.9, ASME B16.28, MSS SP-43, MSS SP-75 JIS B2311, DIN2605/2615/2616/2617, GOST 17375/17376/17378/17379, ISO
Both eccentric reducer black paint and stainless steel eccentric reducer wall thickness can be SCH10/10S, SCH20/the 20S, STD,SCH40/40S, XS,SCH80, XXS, ETC.(for ANSI), SGP(for JIS)
Size: 1/2"-48"(DN15-DN1200), or even bigger
Finishing: Black, Vanish, Oiled, Galvanized.
Connection type: Butt Welding
The welding method is the same, the stainless steel reducer has corrosion resistance, suitable for the corrosive medium pipeline.
When the diameter is changed, the concentric reducer has small interference to the fluid flow state. So the concentric reduce is widely used in gas and vertical liquid pipe system. The eccentric reducer is flat on one side which is good for exhaust or liquid drainage. Therefore, the eccentric reducer is generally used in a horizontally installed liquid pipes.
The offset distance= ½ x (Largest I.D. [inside diameter] – Smallest I.D.)
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