Floating roof tank symbol
A floating roof tank has a roof that floats on the liquid surface, which cuts vapour losses from volatile products.
What the floating roof tank symbol means
A floating roof tank has a roof that floats on the liquid surface, which cuts vapour losses from volatile products.
How it is drawn
An open rectangle with a horizontal line inside near the top for the floating roof.
The floating roof tank symbol in each standard
Drawn as on most US-style legend sheets.
ISO 10628-2 has no separate symbol for this. Check the project legend sheet.
German (DIN): Schwimmdachtank. See DIN P&ID symbols.
Where you see it on a P&ID
For crude oil, gasoline and other volatile liquids.
Tag codes
The floating roof tank is commonly tagged:
- T
- TK
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 floating roof tank symbol look like on a P&ID?
An open rectangle with a horizontal line inside near the top for the floating roof.
What is a floating roof tank used for?
A floating roof tank has a roof that floats on the liquid surface, which cuts vapour losses from volatile products. You will find it for crude oil, gasoline and other volatile liquids.
What tag does a floating roof tank have?
It is commonly tagged T, TK. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the floating roof tank symbol the same in ISA and ISO?
ISO 10628-2 has no separate symbol for this. Check the project legend sheet. Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the floating roof tank called in German?
Schwimmdachtank. 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