Silo or hopper symbol
Also called Hopper, Bin
A silo or hopper stores bulk solids and feeds them out through a cone at the bottom.
What the silo or hopper symbol means
A silo or hopper stores bulk solids and feeds them out through a cone at the bottom.
How it is drawn
A rectangle with a cone underneath ending at an outlet.
The silo or hopper symbol in each standard
Drawn as on most US-style legend sheets.
Bunker with conical bottom. Drawn the same way.
German (DIN): Silo, Bunker. See DIN P&ID symbols.
Where you see it on a P&ID
For catalyst, powders, pellets, sand and cement.
Tag codes
The silo or hopper is commonly tagged:
- S
- SI
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 silo or hopper symbol look like on a P&ID?
A rectangle with a cone underneath ending at an outlet.
What is a silo or hopper used for?
A silo or hopper stores bulk solids and feeds them out through a cone at the bottom. You will find it for catalyst, powders, pellets, sand and cement.
What tag does a silo or hopper have?
It is commonly tagged S, SI. The exact tag format comes from the project numbering procedure and the legend sheets.
Is the silo or hopper symbol the same in ISA and ISO?
Yes, ISO 10628-2 draws it the same way (2064). Companies vary the details, so always check the legend sheets at the front of the P&ID set.
What is the silo or hopper called in German?
Silo, Bunker. 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