Rupture disc symbol
Also called Bursting disc, PSE
A rupture disc is a thin membrane that bursts at a set pressure to relieve overpressure. Once burst it must be replaced, so it is often installed under a relief valve.
What the rupture disc symbol means
A rupture disc is a thin membrane that bursts at a set pressure to relieve overpressure. Once burst it must be replaced, so it is often installed under a relief valve.
How it is drawn
A curved line across the pipe between two short holder bars, bulging in the direction of flow.
The rupture disc symbol in each standard
Drawn as ISA 5.1 defines it, as on most US and international legends.
Rupture disc. A narrow holder in the line with the disc bulging towards the outlet.
ISO SVG
German (DIN): Berstscheibe. See DIN P&ID symbols.
Where you see it on a P&ID
Upstream of relief valves on corrosive services, and alone where fast or full-bore relief is needed.
Tag codes
The rupture disc is commonly tagged:
- PSE
- RD
Tag formats follow the project numbering procedure. For instruments, the letters follow ISA 5.1, explained on the instrument symbols page.
Related symbols
Frequently asked questions
What does the rupture disc symbol look like on a P&ID?
A curved line across the pipe between two short holder bars, bulging in the direction of flow.
What is a rupture disc used for?
A rupture disc is a thin membrane that bursts at a set pressure to relieve overpressure. Once burst it must be replaced, so it is often installed under a relief valve. Upstream of relief valves on corrosive services, and alone where fast or full-bore relief is needed.
What tag does a rupture disc have?
It is commonly tagged PSE, RD. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the rupture disc symbol the same in ISA and ISO?
No. A narrow holder in the line with the disc bulging towards the outlet. The ISO 10628-2 registration number is X8080. Always check the legend sheets at the front of the P&ID set.
What is the rupture disc called in German?
Berstscheibe. 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