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Case

Shanghai Drainage Pipeline and Gas Pipeline Detect

Background:

Case background:


1. Location of the case: the gas pipeline buried at the intersection of Pudong New Area and Songjiang District, Shanghai


2. Demonstration instrument: Vloc3pro, DM


Solution:

Case details:

3. Detection process:

 

(1) The first detected location is at a crossroads in Pudong New Area, and the pipe type is a metal drainage pipe. In actual operation, customers are not sure about the location of the pipeline, and it is relatively inconvenient to find the manhole cover, so the detection method should be used according to the customer's request. First adjust the transmitter to a frequency of 131KHz, and place the transmitter directly above the drainage pipe. The receiver also uses 131KHz for detection. The direct reading depth of the vLp3 pipeline detector is 1.8 meters and the 70% method is used for detection. The depth is 1.73 meters, and then 32.8KHz is used for detection, and the 70% detection depth is 1.65 meters. The actual buried depth of the pipeline measured by the open manhole cover is 1.75 meters. It can be seen that the sensing method can be used to detect the drainage pipeline, and the use frequency can be 131KHz for higher accuracy.

(2) In order to verify the detection accuracy of the DM pipeline anti-corrosion layer detector, the second detection location is a gas pipeline in Songjiang District, because the customer already knows the actual buried depth and plane position of the pipeline. In order to better verify the use effect, first connect the cable of the DM transmitter, the frequency used is 640HZ, the output current is adjusted to 1A, the sounding depth is 4.6 meters at the detection position 20 meters away from the test pile, and the tracking is continued until It was detected that the customer used the PE pipe to dig into the ground to get the pipeline exactly to the position of the pipeline. The obtained pipeline depth was 6 meters. The actual depth detected by the DM receiver was 6.04 meters. The depth is very accurate, and the plane position is exactly where the customer drove down. At the pipeline, the plane position is consistent with the position detected by the receiver. Received unanimous praise from customers on site.

(2) In order to verify the detection accuracy of the DM pipeline anti-corrosion layer detector, the second detection location is a gas pipeline in Songjiang District, because the customer already knows the actual buried depth and plane position of the pipeline. In order to better verify the use effect, first connect the cable of the DM transmitter, the frequency used is 640HZ, the output current is adjusted to 1A, the sounding depth is 4.6 meters at the detection position 20 meters away from the test pile, and the tracking is continued until It was detected that the customer used the PE pipe to dig into the ground to get the pipeline exactly to the position of the pipeline. The obtained pipeline depth was 6 meters. The actual depth detected by the DM receiver was 6.04 meters. The depth is very accurate, and the plane position is exactly where the customer drove down. At the pipeline, the plane position is consistent with the position detected by the receiver. Received unanimous praise from customers on site.