Flame arrestor symbol
Also called Flame arrester
A flame arrestor lets gas pass but stops a flame from travelling back through the line, using a fine metal element that cools the flame below ignition.
What the flame arrestor symbol means
A flame arrestor lets gas pass but stops a flame from travelling back through the line, using a fine metal element that cools the flame below ignition.
How it is drawn
A rectangle in the line with crossed diagonal lines inside.
The flame arrestor symbol in each standard
Drawn as on most US-style legend sheets.
Flame arrestor. A box in the line with a grid inside. Explosion-proof, detonation-proof and fire-resistant versions add a side shape (C0087, C0088, C0091).
ISO SVG
German (DIN): Flammendurchschlagsicherung. See DIN P&ID symbols.
Where you see it on a P&ID
On tank vents, flare and vent lines, and vapour recovery systems.
Tag codes
The flame arrestor is commonly tagged:
- FA
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 flame arrestor symbol look like on a P&ID?
A rectangle in the line with crossed diagonal lines inside.
What is a flame arrestor used for?
A flame arrestor lets gas pass but stops a flame from travelling back through the line, using a fine metal element that cools the flame below ignition. You will find it on tank vents, flare and vent lines, and vapour recovery systems.
What tag does a flame arrestor have?
It is commonly tagged FA. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the flame arrestor symbol the same in ISA and ISO?
No. A box in the line with a grid inside. Explosion-proof, detonation-proof and fire-resistant versions add a side shape (C0087, C0088, C0091). The ISO 10628-2 registration number is 2036. Always check the legend sheets at the front of the P&ID set.
What is the flame arrestor called in German?
Flammendurchschlagsicherung. 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