Acoustic (ultrasonic) gas leak detector
Offshore F&G layout practice (ISA 5.1-style letter codes) / ISO 7240 / NFPA 72
Drawn as
A detector bubble with "UGD" and curved sound arcs beside it.
Meaning
Ultrasonic leak detector that hears high-pressure gas leaks, independent of wind dilution. Becomes acoustic-gas-leak-detector.
Variants
- Some legends mark it "AGLD" or draw a microphone symbol
Tags
UGD · AGD · UGLD