What Is Use of Underground Pipeline Detector?

What Is Use of Underground Pipeline Detector?

2021-11-10
NOYAFA
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What Problems Will Be Encountered in the Use of Underground Pipeline Detector
What Problems Will Be Encountered in the Use of Underground Pipeline Detector
As a new type of intelligent stethoscope, underground pipeline detector is used to survey underground pipelines. It is composed of transmitter, receiver and accessories. It is mainly used for underground pipeline positioning, buried depth measurement and long-distance tracking, as well as pipeline insulation fault point measurement and search. The equipment adopts multi coil electromagnetic technology, which greatly improves its depth determination accuracy and target pipeline identification ability. It can accurately track and locate the target pipeline even in the area with dense and complex pipelines. However, due to the complexity and diversity of underground pipelines, a better method is to combine various technical methods for general survey. The common site conditions in the operation of underground pipeline detector are as follows: 1. Track from the joint or handover box. Before the cable applies the transmitter signal, the common connector on the cable needs to be removed to track the target pipe. If all cables are to be tracked from the junction box, the transmitter can work in an inductive manner, placed on one side of the junction box and in line with the cable to be tracked. 2. Long distance tracking cable. In order for the transmitter signal to transmit a sufficient distance, it is necessary to remove the grounding connection of the cable. When the joint or joint is grounded for safety or lightning protection, surge arrester (anti overload) can be used to replace the grounding of the joint or joint, so as to protect the cable and make uninterrupted positioning possible. 3. Is the connector spike. Most cable connectors or connectors will generate spike pulse when the receiver responds. Working experience and understanding the local situation will help the operator to judge whether the spike pulse indicates that there is a connector box. 4. It's a metal guardrail. The cable is usually buried directly under the road outside the road metal guardrail, and the signal is combined with the continuous metal guardrail. The metal guardrail is close to the antenna at the lower part of the receiver, which is difficult to track. When it comes to the receiver, this difficulty can be overcome by making the internal antenna at the lower end flat with the metal guardrail. 5. Street lighting. Generally, the metal column of street lamp and the metal shielding layer of lighting cable are connected with the metal column. At this time, the transmitter signal can be connected to the metal column of street lamp. If the cement lamp post - unless the lighting cable can be connected to the maintenance rack and grounded, the transmitter signal needs to be connected to the metal shielding of the lighting cable. Knowing the relevant location and depth of lighting cables (and other street facilities on the same lighting system) can help track lighting cables. A connection point may apply signals to a large area of cables. It is also feasible to use street lamp posts to apply signals to other power cables, but the signal may be weak because the signal may have been transmitted for a long distance before returning to the substation and can flow out of the system again. At this time, the transmitter can increase the output power mode and increase the output power. This method can locate cables that are difficult to apply signals or inconvenient. For cables coming down from wooden poles, cement poles or lighting columns, the transmitter can be placed in sensing mode to apply a signal by making a right angle to the ground on the pole.
Instructions for Use of Underground Pipeline Detector
Instructions for Use of Underground Pipeline Detector
About the underground pipeline detector, Xiaobian has made a brief introduction to you in the previous article, so I won't repeat it one by one here. Today, we will mainly introduce the problems that should be paid attention to when using the underground pipeline detector. If you are interested in this, you can read this article carefully. Underground pipeline detector is a necessary tool for construction, acceptance and ground survey in municipal, electric power, telecommunications, tap water, gas, petrochemical, railway and other industries. Since its application in China, the underground pipeline detector for power production has a large number of users in the fields of power, telecommunications, water supply, heat, gas, petroleum, chemical industry, urban public utilities and so on with its excellent performance and flexible and convenient detection methods. The underground pipeline detector plays a positive role in improving the pipeline management level of relevant industries in China. The underground pipeline detector is composed of transmitter, receiver and accessories, which is used for accurate positioning, buried depth measurement and long-distance tracking of underground pipeline routing, as well as measurement and search of pipeline insulation fault points. The underground pipeline detector adopts multi coil electromagnetic technology, which improves the accuracy of pipeline positioning depth and the identification ability of target pipeline. It can also accurately track and locate the target pipeline in the area with dense and complex pipelines. The leakage current of the pipeline to the ground can be received by the two pins of the A-frame respectively, and the signal size displayed by the receiver is the difference between the received signals of the two pins. When the difference received by the two pins is zero, it indicates that the A-frame is directly above the fault point. Determine the wire path before fault location test. If there is abnormal signal loss during pipeline test, some signals may escape from the damaged insulation to the ground. When the path is determined and the general fault area is determined, cut off the connection point between the pipeline terminal and the ground to make the leakage current concentrate through the fault point. If the connection between the pipeline and the ground is disconnected, the current transmitted by the transmitter will flow out of the fault point, which will increase the escape of current at the fault point, which is conducive to fault location. Connect the transmitter to the cable, select the frequency as low frequency and the working mode as A-frame mode. Connect the receiver to the A-frame and insert the A-frame into the soil with appropriate force. Note: the underground pipeline detector receives the operation alarm of error current test. If a current reading of 000 is displayed during the current test, the receiver has detected an incorrect current reading. Check that the cable at the depth measuring point is straight at least 5m in front and behind. Check whether the signal within 10m is relatively stable, conduct depth measurement on both sides of the initial depth measurement point, and check whether there are adjacent interference pipes within 3-4m near the target cable. This is the most common cause of depth measurement error. Strong signals induced by adjacent pipelines may lead to 50% depth measurement error. For several depth measurements slightly deviated from the pipe position, the minimum depth reading is the most accurate, and the position indicated here is also the most accurate.
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