What B means on a P&ID.
Most B-prefix work hides inside a packaged Burner Management System block. Vendor-supplied logic that the P&ID represents as one box rather than spelling out every flame detector and ignitor. When you do see B tags broken out, it's usually a flame scanner or a burner-running status switch the BPCS needs for sequencing. The cement kiln and recovery boiler folks see them more than anyone.
Also stands for.
- User's choice, some specifications
Common second letters.
| Tag | Meaning |
|---|---|
| BT | Transmitter, BT. Burner condition transmitter, e.g. Flame intensity |
| BS | Switch, BS. Burner status, BSL. Burner switch low |
| BY | Computing element, BY. Burner management logic |
Example tags.
| Tag | Meaning |
|---|---|
| BS-101 | Burner status switch on loop 101 |
| BY-301 | Burner management computing element |
Typical placement.
On burners, ignitors, and combustion management systems. B-prefix tags are common on cement kilns, recovery boilers, fired heaters, and sulfur recovery thermal oxidizers.
Common questions
What does the ISA 5.1 first letter B stand for?
In ISA 5.1, the first letter B stands for Burner, Combustion. It can also stand for User's choice, some specifications.
How is letter B typically used on a P&ID?
On burners, ignitors, and combustion management systems. B-prefix tags are common on cement kilns, recovery boilers, fired heaters, and sulfur recovery thermal oxidizers.
What second letters commonly follow B in ISA 5.1 tags?
Common combinations include BT (Transmitter, BT. Burner condition transmitter, e.g. Flame intensity), BS (Switch, BS. Burner status, BSL. Burner switch low), BY (Computing element, BY. Burner management logic).
What are example ISA 5.1 tags starting with B?
BS-101 (Burner status switch on loop 101); BY-301 (Burner management computing element).
Run it on your drawings.
Upload a P&ID set and see every tag read in the convention the drawing already uses.