Flame detector
Offshore F&G layout practice (ISA 5.1-style letter codes) / ISO 7240 / NFPA 72
Drawn as
A detector bubble with "FD" and a dashed cone showing its field of view.
Meaning
Optical flame detector (IR3, UV/IR), voting 2ooN for confirmed fire. Becomes flame-detector.
Variants
- ISA letter B (burner, combustion) is used on some P&IDs: BE or BS
- The cone shows the aiming direction on F&G layouts
Tags
FD · BS · IR3 · BE · BS