Analysis of the use of buried pipeline anti-corrosion layer detection leak detector - Database & Sql Blog Articles

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Buried pipeline anti-corrosion layer detection leak detector

The detection principle is to send a specific high-frequency modulation signal to the underground pipeline, form a loop with the earth at the damage point of the underground pipeline anti-corrosion layer, and radiate to the ground. The radiation signal is strongest above the damage, and find the pipeline anti-corrosion layer according to this principle. Break point. The detection method is to use the "human body capacitance method", which is to use the human body as the sensing element of the leak detector. When the leak detector goes near the leak point, the leak detector emits an audible prompt, when it reaches the leak point directly, The value is the largest, so the leak point is accurately found. However, what are the precautions in the use of buried pipeline anti-corrosion detection leak detector? Here is the introduction of Beijing Jintai Keyi for everyone.

Pay attention to the following points when using the buried pipeline anti-corrosion layer detection leak detector:

1. When the probe receiver is working, sometimes the artifact of the pipeline is detected in the pipeline. The illusion generally has the following characteristics, which can be distinguished:

(1) The signal strength measured at the imaginary site does not match the actual position of the pipeline;

(2) The position of the pipeline measured by the peak method and the zero value method does not coincide;

(3) Change the transmitter's transmit signal injection point or ground line ground point, and the artifact will disappear.

2. The depth measurement is for the center of the pipeline. The depth of the top of the pipeline needs to be subtracted from the radius of the pipeline. For large-diameter pipeline plane positioning and sounding, the dummy points are wide, and corrections should be made to take the center position of the dummy point to locate and measure the pipeline.

3. There is a blind area in a certain area around the transmitter. The receiver will receive from this range.

Signals on both the transmitter and the pipeline, if they are to be detected within this range, extend the transmitter and move the transmitter to a slightly further distance.

4. If the peak and zero calibration positions coincide, the positioning can be considered accurate. If the marks do not coincide, the positioning is inaccurate. The mark shows the error on the same side of the pipeline, and the true position of the pipeline is close to the peak.

5. Whether the pipeline sounding is correct or not depends largely on whether the plane positioning is accurate. When there are other pipelines near the pipeline branch and on the side, the magnetic field will be superimposed. The data measured at this place is the result of superposition of each pipeline. The magnetic field is distorted relative to the single pipeline. Therefore, the sounding depth should be selected. In the middle of a straight line segment of a single pipeline, the length of the straight section should be more than 5 times the depth of the pipeline.

6. The overlying soil on the pipeline to be tested should have good contact with the pipeline. The newly laid pipeline should be densely soiled after a period of covering the soil, and the pipeline should be fully contacted before leak detection, otherwise the effect will be poor.

7. When the instrument is leak-detecting, the horizontal method should be adopted, that is, the prober walks above the pipeline, and the inspector leaves the pipeline to make the detection line of the leak detector perpendicular to the pipeline direction. When the value displayed by the leak detector and the maximum sound are detected, The location of the manager is the location of the leak.

8. The two test lines of the leak detector must have good contact with the human body. The human body can't touch the shielding layer, and the core wire and the shielding layer cannot touch each other, otherwise the side detector will fail.

9. The transmitter ground wire should preferably not cross other pipelines or be placed on top of another pipeline. In this case, the transmit signal will be coupled to other pipelines, which may cause misjudgment.

Welcome everyone to check it out.