Fired heater symbol
Also called Furnace, Process heater
A fired heater heats a process fluid in tubes with the flame from burning fuel. It reaches temperatures that steam or hot oil cannot.
What the fired heater symbol means
A fired heater heats a process fluid in tubes with the flame from burning fuel. It reaches temperatures that steam or hot oil cannot.
How it is drawn
A box with a zig-zag coil inside, burners at the bottom and a stack on top.
The fired heater symbol in each standard
Drawn as on most US-style legend sheets.
Furnace. An open-topped double outline. Burners (X8107) and combustion chambers (X8106) have their own symbols.
ISO SVG
German (DIN): Ofen. See DIN P&ID symbols.
Where you see it on a P&ID
On crude and vacuum units, reformers, crackers and hot oil systems.
Tag codes
The fired heater is commonly tagged:
- H
- F
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 fired heater symbol look like on a P&ID?
A box with a zig-zag coil inside, burners at the bottom and a stack on top.
What is a fired heater used for?
A fired heater heats a process fluid in tubes with the flame from burning fuel. It reaches temperatures that steam or hot oil cannot. You will find it on crude and vacuum units, reformers, crackers and hot oil systems.
What tag does a fired heater have?
It is commonly tagged H, F. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the fired heater symbol the same in ISA and ISO?
No. An open-topped double outline. Burners (X8107) and combustion chambers (X8106) have their own symbols. The ISO 10628-2 registration number is 2533. Always check the legend sheets at the front of the P&ID set.
What is the fired heater called in German?
Ofen. 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