long-range pipeline monitoring by distributed fiber optic sensing

光ファイバー温度センサ, インテリジェント監視システム, 中国の分散型光ファイバーメーカー

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. そこで, 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.

目下, 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, distributed fiber optic method, 等. based on the different gas flow parameters monitored inside the pipeline. The gas pipeline leakage detection method based on distributed fiber optic sensing has been widely studied and applied due to its advantages of good sensitivity, 高い位置決め精度, 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.

Advantages of distributed fiber optic natural gas transmission pipeline security vibration monitoring technology:

1. 測定の死角のない温度と振動の連続分布測定

2. 複数のイベントの同時検出と正確な位置特定

3. 光ファイバーは、伝送とセンシングを組み合わせたセンサーです

4. 40 キロメートルの超長距離測定距離, 豊富な測定情報

5. 速い応答速度, アラーム within 1 秒

6. 光信号伝送, 完全に電気的に絶縁されています, 電磁干渉に対する耐性

7. 本質安全防爆仕様, 可燃性および爆発性の環境での長期運転に適しています

8. 誤報率の低い安定した信頼性の高い測定

9. 光ファイバーの長寿命化, まで 30 メンテナンスフリー年

Performance characteristics of distributed fiber optic vibration monitoring system:

長い温度距離: 40キロメートル

迅速な対応: 典型的な 1 秒

高い位置決め精度: 2-50m

高感度: 光ケーブルの周囲40m以内の振動を感知できます

振動と温度の同時監視

光ファイバー障害のオンライン監視機能

Friendly user software that provides a visual interface

 

Performance indicators of distributed fiber optic vibration monitoring system:

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 秒

Measurement channels 1, 2, 4, 8

Vibration signal bandwidth ≤ 5KHz

Vibration measurement sensitivity ≤ 40m

Temperature measurement range -100 ℃~200 ℃