Flange symbol
Also called Flanged joint, Flange pair
A flanged joint bolts two pipe ends together, so the line can be opened for maintenance, blinding or removing equipment.
What the flange symbol means
A flanged joint bolts two pipe ends together, so the line can be opened for maintenance, blinding or removing equipment.
How it is drawn
Two short parallel lines across the pipe.
The flange symbol in each standard
Drawn as on most US-style legend sheets.
Flanged connection. Drawn the same way: two short bars across the line.
German (DIN): Flanschverbindung. See DIN P&ID symbols.
Where you see it on a P&ID
At equipment nozzles, valves, spool breaks and blinding points.
Related symbols
Frequently asked questions
What does the flange symbol look like on a P&ID?
Two short parallel lines across the pipe.
What is a flange used for?
A flanged joint bolts two pipe ends together, so the line can be opened for maintenance, blinding or removing equipment. You will find it at equipment nozzles, valves, spool breaks and blinding points.
Is the flange symbol the same in ISA and ISO?
Yes, ISO 10628-2 draws it the same way (511). Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the flange called in German?
Flanschverbindung. On a German R&I-Fließschema it is drawn to DIN EN ISO 10628-2.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016