Sphere symbol
Also called Spherical tank, Horton sphere
A spherical tank stores gases and liquefied gases under pressure. The sphere spreads the stress evenly across the shell.
What the sphere symbol means
A spherical tank stores gases and liquefied gases under pressure. The sphere spreads the stress evenly across the shell.
How it is drawn
A circle on legs.
The sphere symbol in each standard
Drawn as on most US-style legend sheets.
Spherical vessel on legs. Drawn the same way. Without legs it is 2063.
German (DIN): Kugelbehälter. See DIN P&ID symbols.
Where you see it on a P&ID
For LPG, butane, propane and other liquefied gases.
Tag codes
The sphere is commonly tagged:
- T
- V
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 sphere symbol look like on a P&ID?
A circle on legs.
What is a sphere used for?
A spherical tank stores gases and liquefied gases under pressure. The sphere spreads the stress evenly across the shell. You will find it for LPG, butane, propane and other liquefied gases.
What tag does a sphere have?
It is commonly tagged T, V. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the sphere symbol the same in ISA and ISO?
Yes, ISO 10628-2 draws it the same way (X8010). Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the sphere called in German?
Kugelbehälter. 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