Concentric Reducer
The concentric reducer centerline of the inlet and outlet is at the same level.
- Buttweld Datasheet - Concentric
Eccentric Reducer
The eccentric reducer offset is equals 1/2 times the larger ID minus the smaller ID.
The eccentric reducer is used to keep either the top or bottom of the pipe level. It is used with the flat side up FOT or flat side down FOB. In wet gas such as casing gas applications, an eccentric reducer should be used that is flat on bottom to prevent condensing liquids from pocketing.
It is common practice to install eccentric reducers on a liquid line that might have a little gas in it with the flat side of the reducer is put on the top. That ensures that any bubbles that come along the top pass immediately through the pump and not accumulate. If they accumulate, they may collect and enter the pump in bulk causing it to intermittently cavitate.
- Buttweld Datasheet - Eccentric
