monitoraggio delle condutture a lungo raggio mediante rilevamento distribuito in fibra ottica

There are some minor defects in the production process of natural gas transmission pipelines. Under long-term transmission loads and the high temperature and corrosive environment of the transmission medium, pipeline corrosion will accelerate and worsen, ultimately leading to pipeline damage and leakage accidents, causing huge direct economic losses, and triggering a series of secondary disasters, such as fires and environmental pollution, posing a threat to people’s life safety. Perciò, safety issues during natural gas pipeline transportation, especially online real-time leak detection of natural gas pipelines, have always been a top priority that needs to be considered in safety production.

Attualmente, there are many leakage monitoring methods for gas pipelines, which can be divided into mass/volume balance method, applied statistical method, negative pressure wave method, transient model method, fibra ottica distribuita metodo, ecc. based on the different gas flow parameters monitored inside the pipeline. The gas pipeline leakage detection method based on fibra ottica distribuita sensing has been widely studied and applied due to its advantages of good sensitivity, elevata precisione di posizionamento, short detection time, strong adaptability, and long system life. When a gas pipeline ruptures at a certain point and leaks, it will disrupt the normal pressure balance in the pipeline, release the elastic energy of the fluid in the pipeline system, and cause instantaneous oscillation to produce sound waves. The leakage sound wave is generated by the excited energy of gas leakage, and is a continuously emitted signal with a frequency of several hundred kHz, mainly propagating along the pipe wall. By using optical fibers installed along the pipeline, this acoustic signal can be monitored and collected. By extracting and identifying the characteristics of the acoustic signal, it can be determined whether there is a leak in the pipeline.

Vantaggi di fibra ottica distribuita natural gas transmission pipeline security vibration monitoring technology:

1. Misura continua e distribuita di temperatura e vibrazioni senza punti ciechi di misurazione

2. Rilevamento simultaneo e localizzazione accurata di più eventi

3. La fibra ottica è un sensore che combina trasmissione e rilevamento

4. 40 chilometri di distanza di misurazione ultra lunga, ricche informazioni di misurazione

5. Velocità di risposta rapida, allarme all'interno 1 secondo

6. Trasmissione del segnale ottico, completely electrically insulated, resistente alle interferenze elettromagnetiche

7. Sicurezza intrinseca, suitable for long-term operation in flammable and explosive environments

8. Stable and reliable measurement with low false alarm rate

9. Long service life of optical fibers, fino a 30 years maintenance free

Performance characteristics of sistema distribuito di monitoraggio delle vibrazioni in fibra ottica:

Long temperature distance: 40km

Tempi di risposta rapidi: tipico 1 secondo

High positioning accuracy: 2-50M

Alta sensibilità: can perceive vibrations within 40m around the optical cable

Simultaneous monitoring of vibration and temperature

Online monitoring function for fiber optic faults

Friendly user software that provides a visual interface

 

Performance indicators of sistema distribuito di monitoraggio delle vibrazioni in fibra ottica:

Technical performance

Fiber type single-mode fiber

Measurement distance of 40km

Positioning accuracy of 1m~50m

Sampling interval of 0.5m

Measurement time typical 1 secondo

Measurement channels 1, 2, 4, 8

Vibration signal bandwidth ≤ 5KHz

Vibration measurement sensitivity ≤ 40m

Intervallo di misurazione della temperatura -100 ℃~200 ℃

Sensore di temperatura a fibra ottica, Sistema di monitoraggio intelligente, Produttore di fibra ottica distribuito in Cina