What is An eccentric reducer ?
An eccentric reducer is a fitting used in piping systems between two pipes of different diameters. The same fitting can be used in reverse as an eccentric increaser or expander. They are used where the diameter of the pipe on the upstream side of the fitting (i.e. where flow is coming from) is larger than the downstream side, and where there is a danger that vapour may accumulate.[1] Unlike a concentric reducer, which resembles a cone, eccentric reducers have an edge that is parallel to the connecting pipe, referred to as the flat side. This parallel edge results in the two pipes having offset center lines. Because eccentric reducers are asymmetrical, they create asymmetrical flow conditions; flow is faster along the angled side, resulting in increased pressure.
Eccentric reducer Dimensions
| Size Range | 3″-60″/DN20-DN1500 |
| Thickness Schedule | SCH10-SCH160,XSX |
| China Standard | GB/T12459,GB/T13401,HG/T21635/21631,SH348/3409 |
| America Standard | ANSI/ASME B 16.9/MSS SP43 |
| Europe Standard | EN10253 |
| Carbon Steel | Q235,20#,35#,45#,20G,ASTM A234 WPB/WPC |
| Low Tem Carbon Steel | Q345B,16Mn,ASTM A420 WPL6 |
| Pipeline Steel | ASTM A860 WPHY 42/46/46/60/65 |
| Alloy Steel | ASTM A234 WP11/WP12/WP5/WP9/WP91/WP92,15CrMoG |
| Stinless Steel | ASTM A403 WP304/304L/304H,316,316L,310S,317,347,904L |
Concentric vs Eccentric Reducer: What’s the Difference?
The cone-shaped concentric pipe reducer means the pipes have matched center lines, and the eccentric reducer has mis-matched center lines. Both of these have a consequence regarding flow. Most reducers are going to be concentric. Eccentric reducers are used when the pipes have to maintain the same top or bottom level. Eccentric reducers are frequently used to avoid trapping air within the system, so they are often used when both air and liquids may be flowing together.Most people are going to need a cone-shaped concentric pipe reducer, because they aren’t going to need one side of the reducer to remain flat. But in many applications, either can be used, as long as the bottom of the eccentric reducer is placed correctly. The major concern about eccentric reducers is that they can collect liquids or gasses in one area if they are not properly aligned. When used vertically, there is essentially no difference between a concentric or eccentric pipe reducer
