Horizontal vessel symbol
Also called Horizontal drum, Separator
A horizontal pressure vessel suits services with a large liquid volume or where liquids need time to separate, such as oil, water and gas.
What the horizontal vessel symbol means
A horizontal pressure vessel suits services with a large liquid volume or where liquids need time to separate, such as oil, water and gas.
How it is drawn
A long horizontal rectangle with rounded ends, sometimes with a boot underneath for water.
The horizontal vessel symbol in each standard
Drawn as on most US-style legend sheets.
Tank, vessel with dished ends. Drawn the same way, turned horizontal.
German (DIN): Liegender Behälter. See DIN P&ID symbols.
Where you see it on a P&ID
As three-phase separators, reflux drums, flash drums and storage bullets.
Tag codes
The horizontal vessel is commonly tagged:
- 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 horizontal vessel symbol look like on a P&ID?
A long horizontal rectangle with rounded ends, sometimes with a boot underneath for water.
What is a horizontal vessel used for?
A horizontal pressure vessel suits services with a large liquid volume or where liquids need time to separate, such as oil, water and gas. You will find it as three-phase separators, reflux drums, flash drums and storage bullets.
What tag does a horizontal vessel have?
It is commonly tagged V. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the horizontal vessel symbol the same in ISA and ISO?
Yes, ISO 10628-2 draws it the same way (2062). Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the horizontal vessel called in German?
Liegender Behälter. 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