Flanged joint symbol
Also called Flange pair, Bolted joint
Two short lines across the pipe mark a flanged joint: two flanges bolted together with a gasket between them.
What the flanged joint symbol means
Two short lines across the pipe mark a flanged joint: two flanges bolted together with a gasket between them.
How it is drawn
Where you see it
Connections to valves, equipment nozzles and instruments, and breaks where a spool must be removable.
What is written next to it
On the isometric, the flanged joint usually carries the flange rating and facing in the bill of materials, and on many projects a joint number for bolt tightening.
What gets checked on site
For a flanged joint, the site checks usually cover gasket, bolting and tightening or torque, recorded joint by joint, and the joint is checked for leaks in the pressure test. 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 flanged joint symbol look like?
Two short parallel lines across the pipe.
Where is a flanged joint used?
Connections to valves, equipment nozzles and instruments, and breaks where a spool must be removable.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016