Underground pipeline anti-corrosion layer leak detector
The detection principle involves sending a specific high-frequency modulated signal into the underground pipeline, forming a loop with the earth at the damaged point of the anti-corrosion layer and radiating to the ground. The strongest signal is detected directly above the damage point, allowing for accurate identification of the break in the anti-corrosion layer. This method uses the "body capacitance method," where the human body acts as the sensing element of the leak detector. When the device approaches the leak point, it emits an audible alert, and when it is directly over the leak, the signal reaches its maximum, enabling precise location of the fault. However, there are several important precautions to consider when using this type of leak detector. Here’s what Beijing Jintai Keyi recommends.
When using an underground pipeline anti-corrosion layer leak detector, be sure to follow these key guidelines:
1. While the probe receiver is operating, sometimes false signals from the pipeline itself can be detected. These false readings usually have certain characteristics that help distinguish them from real leaks:
- The signal strength measured at the false location does not match the actual pipeline position.
- The positions identified by the peak and zero methods do not align.
- If you change the transmitter's signal injection point or the grounding point, the false reading will disappear.
2. For depth measurement, the center of the pipeline is the reference point. To get the correct depth, subtract the pipeline radius from the top measurement. For large-diameter pipelines, the false points may be wide, so it's essential to adjust and use the center of the false point for accurate positioning.
3. There is a blind zone around the transmitter where the receiver might pick up interference from both the transmitter and the pipeline. If you need to detect within this area, move the transmitter slightly further away to avoid signal distortion.
4. If the peak and zero calibration marks coincide, the positioning is likely accurate. If they don’t match, the reading is unreliable. In such cases, the error is on the same side of the pipeline, and the true location is closer to the peak value.
5. Accurate pipeline sounding largely depends on correct horizontal positioning. If there are other nearby pipelines, their magnetic fields may overlap, causing distorted readings. It’s best to perform measurements on a straight section of the pipeline, ideally longer than five times the pipeline depth, to ensure reliable results.
6. The soil covering the pipeline must make good contact with the pipe. Newly laid pipelines should be fully covered with compacted soil before testing, as poor contact can lead to inaccurate results.
7. When conducting leak detection, walk along the pipeline horizontally. Keep the detector perpendicular to the pipeline direction while walking. When the signal reaches its maximum and the sound is loudest, that’s the location of the leak.
8. Ensure the two test leads of the detector make proper contact with the user’s body. Avoid touching the shielding layer, and keep the core wire and shielding layer separate to prevent malfunction of the detector.
9. The transmitter’s grounding wire should avoid crossing other pipelines or being placed on top of another line. This prevents signal coupling, which could lead to incorrect readings and misdiagnosis.
We hope this guide helps you better understand how to use the underground pipeline anti-corrosion layer leak detector effectively. Feel free to explore more about our products and services!
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