Expansion joint symbol
Also called Bellows
An expansion joint absorbs movement in a pipe from thermal expansion, vibration or settlement, with a flexible bellows.
What the expansion joint symbol means
An expansion joint absorbs movement in a pipe from thermal expansion, vibration or settlement, with a flexible bellows.
How it is drawn
A zig-zag or a box with zig-zag sides in the line.
The expansion joint symbol in each standard
Drawn as on most US-style legend sheets.
German (DIN): Kompensator. See DIN P&ID symbols.
Where you see it on a P&ID
On hot lines, turbine and compressor connections, and ducting.
Related symbols
Frequently asked questions
What does the expansion joint symbol look like on a P&ID?
A zig-zag or a box with zig-zag sides in the line.
What is a expansion joint used for?
An expansion joint absorbs movement in a pipe from thermal expansion, vibration or settlement, with a flexible bellows. You will find it on hot lines, turbine and compressor connections, and ducting.
Is the expansion joint symbol the same in ISA and ISO?
No. A lens shape in the line. The ISO 10628-2 registration number is 533. Always check the legend sheets at the front of the P&ID set.
What is the expansion joint called in German?
Kompensator. 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