Concentric reducer symbol
Also called Reducer
A concentric reducer changes the pipe size with both ends on the same centre line.
What the concentric reducer symbol means
A concentric reducer changes the pipe size with both ends on the same centre line.
How it is drawn
Where you see it
Vertical lines and anywhere the size changes and the centre line can stay put, such as pump discharges.
What is written next to it
On the isometric, the concentric reducer usually carries an item number and the two sizes, such as 6" x 4".
What gets checked on site
For a concentric reducer, the site checks usually cover the welds at each end and the size against the drawing. Each check is recorded against the line and the joint, so the line can go into its test pack and be handed over with its evidence. See the ITR guide.
Related symbols
Frequently asked questions
What does the concentric reducer symbol look like?
A symmetrical taper between the two pipe sizes.
Where is a concentric reducer used?
Vertical lines and anywhere the size changes and the centre line can stay put, such as pump discharges.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016