BASIS PRINCIPLE OF ACOUSTIC CONTROL
Leakages Detection with the Acoustic Method
The acoustic method principle is to identify leakages signals through ultra-sounds emitted nearby the valve shut-off WITHOUT ANY LOSS OF PRODUCTION.
Ultra-sonic signals could come from a lot of points:
- Variable flow involving turbulences,
- Transformation of liquid into steam,
- Mechanical parts movements.
Many factors will influence the spreading and the attenuation of the leakage signal, so the amplitude and the spectral distribution in the parts and the pipes:
- Pressure difference upstream and downstream,
- Kind of material used for valves and pipes,
- Valve geometry,
- Presence of flanges with seals,
- Kind and temperature of the fluid,
- Dissolved gas presence in the fluid,
- Sensibility and position of used sensors,
- Background noise.
To determine leak severity, MMC uses a digital analyzer with these technical specifications:
- Touch-sensitive screen
- Acquisition card up to 2400 kHz
- Acoustic emission sensor
- All configurations available
- Intrinsically Safe. (Explosion proof)