Pipeline water leakage detection method

Abstract

The invention belongs to the technical field of pipeline water leakage detection, and particularly relates to a pipeline water leakage detection method, which comprises the following steps of S1, carrying out global observation and understanding on a site; s2, closing a water supply source valve, and cutting off pipeline water supply; s3, connecting an air compressor and a tracer gas generator into a pipeline water leakage detection area pipe network; s4, the compressed gas and the tracer gas are mixed and then filled in the pipeline; s5, a tracer gas signal machine is used for conducting comprehensive survey, and after tracer gas is surveyed, a pipeline water leakage point large area is delimited; s6, performing comprehensive survey in the large area of the pipeline water leakage point by using ultrasonic equipment, and delimiting a small area of the pipeline water leakage point after a water leakage sound signal is surveyed; and S7, punching in the small area of the water leakage point of the pipeline, inserting the sound listening rod into the hole, distinguishing sound through the sound listening rod, and locking the water leakage point of the pipeline in combination with the attachment condition of the outer wall of the sound listening rod. According to the method, the water leakage point of the pipeline can be quickly and accurately determined, fixed-point pipeline maintenance is realized, and the maintenance cost is greatly saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline leakage detection, and particularly relates to a pipeline leakage detection method. Background Art

[0002] In modern urban infrastructure, water supply networks, fire protection systems, and industrial pipelines are the core carriers for ensuring people's livelihood safety and production operation. However, leakage problems caused by pipeline aging, corrosion, or external force damage have long existed. According to the statistics of "China Urban Water Service Development Report", the average leakage rate of urban water supply networks in China is as high as 15%-20%, wasting more than 7 billion tons of water resources annually. At the same time, the hidden leakage of buried pipelines may induce secondary disasters such as foundation settlement and equipment corrosion. How to efficiently and accurately detect pipeline leaks has become an urgent need in the fields of municipal management, industrial production, and environmental protection.

[0003] Existing common detection methods all have certain defects. For example: The traditional handheld listening rod technology - detecting the sound of water leakage at exposed points of pipelines. Its effect is affected by background noise, pipeline internal pressure, and the experience of leak detection personnel. When the pipeline burial depth is large, the leakage point cannot be detected. The electronic amplification sound detector (pipeline leakage detector) - comparing the sound intensity along the suspected leakage pipeline in a certain step, but it is difficult to be effectively applied in a noisy environment and a busy urban environment, and is also affected by soil properties. The correlation instrument analysis method - using the delay of the leakage sound to determine the location of the leakage point, with relatively accurate positioning, but often has poor effects on non-metal pipelines. The ground radar leak detection method - using electromagnetic principles to detect underground pipelines, and positioning the pipeline leakage point by collecting electromagnetic cracks in reverse, which is suitable for the detection of large-diameter or non-metal pipelines. However, it is difficult to accurately determine the initial leakage point, the image analysis is difficult, and the data processing is slow. The instantaneous flow detection method - positioning the leakage point by identifying the pipeline pressure signal, artificially generating an instantaneous flow change process, and comparing the calculated instantaneous pressure change process with the actual pressure change under different leakage point positions and leakage area conditions also has noise interference, resulting in incorrect inverse problem analysis results and low model reliability. Thus, gradually determining the leakage point is an extremely cumbersome process, and currently, there is no scientific, effective, and general method for the leak detection operation of urban basic water pipelines. Summary of the Invention

[0004] In view of the above deficiencies existing in the prior art, the present invention provides a pipeline leakage detection method to solve the above existing problems.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pipeline leakage detection method includes the following steps:

[0007] S1. Conduct a global observation and understanding of the site where the side leakage operation is required to determine the pipeline distribution, water supply source, and terrain conditions;

[0008] S2. Close the water supply source valve, cut off the pipeline water supply, and clear the area for pipeline leakage detection;

[0009] S3. Connect the air compressor and the tracer gas generator to the pipeline network in the pipeline leakage detection area and connect them to the pipeline;

[0010] S4. Turn on the air compressor and the tracer gas generator. After the compressed gas and the tracer gas are mixed, they fill the pipeline;

[0011] S5. Use a tracer gas signal detector to conduct a comprehensive survey on the ground along the pipeline distribution direction of the pipeline network in the pipeline leakage detection area. After detecting the tracer gas, delimit the large area of the pipeline leakage point;

[0012] S6. Use ultrasonic equipment to conduct a comprehensive survey on the ground within the large area of the pipeline leakage point. After detecting the leakage sound signal, delimit the small area of the pipeline leakage point;

[0013] S7. Drill holes downward into the ground within the small area of the pipeline leakage point, insert a listening rod into the hole, identify the sound through the listening rod, and combine with the situation of whether there is water and soil attached to the outer wall when the listening rod is taken out to lock the pipeline leakage point;

[0014] S8. Excavate the ground at the pipeline leakage point to expose the leaking pipeline, conduct fixed-point repair on the pipeline, and backfill the excavation area after the repair is completed.

[0015] Furthermore, in step S4, the air compressor sets a reasonable pressure value according to the pipeline diameter of the pipeline.

[0016] Furthermore, in step S4, the tracer gas is hydrogen.

[0017] Furthermore, in step S4, after the compressed gas and the tracer gas are mixed, the concentration of the tracer gas remains within the safe value.

[0018] Furthermore, steps S6 and S7 are carried out under the condition that the surrounding environment is relatively quiet to avoid the influence of environmental noise.

[0019] Furthermore, in step S7, the buried depth of the pipeline is predicted and determined before drilling to avoid damaging the pipeline during the drilling process.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can quickly and accurately determine the water leakage point of the pipeline, realize fixed-point maintenance of the pipeline, greatly save the maintenance cost, effectively avoid a large amount of waste of water resources, and at the same time avoid geological settlement caused by long-term water leakage, thus causing greater potential safety hazards. Detailed implementation manners

[0022] In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with embodiments.

[0023] Embodiment:

[0024] A pipeline water leakage detection method of the present invention includes the following steps:

[0025] S1. Conduct a global observation and understanding of the site where the leak detection operation needs to be carried out, and determine the pipeline distribution, water supply source and terrain state;

[0026] S2. Close the water supply source valve, cut off the water supply of the pipeline, and clear the site of the pipeline water leakage detection area;

[0027] S3. Connect an air compressor and a tracer gas generator to the pipeline network in the pipeline water leakage detection area and connect them to the pipeline;

[0028] S4. Turn on the air compressor and the tracer gas generator. The generated compressed gas and tracer gas are mixed and filled in the pipeline. The air compressor sets a reasonable pressure value according to the pipeline diameter of the pipeline. The tracer gas is hydrogen. After the compressed gas and the tracer gas are mixed, the concentration of the tracer gas remains within the safe value;

[0029] S5. Use a tracer gas signal machine to conduct a comprehensive survey on the ground along the pipeline distribution direction of the pipeline network in the pipeline water leakage detection area. After detecting the tracer gas, delimit a large area of the pipeline water leakage point;

[0030] S6. Use an ultrasonic device to conduct a comprehensive survey on the ground within the large area of the pipeline water leakage point. After detecting the water leakage sound signal, delimit a small area of the pipeline water leakage point;

[0031] S7. Drill holes underground within the small area of the pipeline water leakage point, insert a listening rod into the hole, distinguish the sound through the listening rod, and combine the situation of whether there is water and soil attached to the outer wall when the listening rod is taken out to lock the pipeline water leakage point. Before drilling, first predict and determine the buried depth of the pipeline to avoid damaging the pipeline during the drilling process;

[0032] Steps S6 and S7 are carried out under the state that the surrounding environment is relatively quiet to avoid the influence of environmental noise;

[0033] S8. Excavate the ground at the pipeline water leakage point to expose the leaking pipeline, conduct fixed-point maintenance on the pipeline, and after the maintenance is completed, backfill the excavation area.

[0034] The above are only embodiments of the present invention. Common knowledge such as specific structures and characteristics known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can learn all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, complete and implement this solution in combination with their own abilities. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, if the term "connection" and the like are used to indicate the connection relationship between components, this term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific situations.

Claims

1. A pipeline leakage detection method, characterized in that, It includes the following steps: S1. Conduct a global observation and understanding of the site where the leak detection operation is to be carried out, and determine the pipeline distribution, water supply source and terrain status; S2. Close the water supply source valve, cut off the pipeline water supply, and clear the pipeline leak detection area; S3. Connect the air compressor and the tracer gas generator to the pipeline network in the pipeline leak detection area and connect them to the pipeline; S4. Start the air compressor and the tracer gas generator, and the compressed gas and the tracer gas generated are mixed and filled in the pipeline; S5. Use the tracer gas signal machine to conduct a comprehensive survey on the ground along the pipeline distribution direction of the pipeline network in the pipeline leak detection area. After detecting the tracer gas, delimit the large area of the pipeline leak point; S6. Use ultrasonic equipment to conduct a comprehensive survey on the ground within the large area of the pipeline leak point. After detecting the leak sound signal, delimit the small area of the pipeline leak point; S7. Drill a hole into the ground within the small area of the pipeline leak point, insert the listening rod into the hole, distinguish the sound through the listening rod, and lock the pipeline leak point in combination with the situation of whether there is water and soil attached to the outer wall when the listening rod is taken out; S8. Excavate the ground at the pipeline leak point to expose the leaking pipeline, conduct fixed-point maintenance on the pipeline, and backfill the excavation area after the maintenance is completed.

2. The pipeline leakage detection method according to claim 1, characterized in that: In step S4, the air compressor sets a reasonable pressure value according to the pipeline diameter of the pipeline.

3. The method for detecting pipeline water leakage according to claim 1, characterized in that: In step S4, the tracer gas is hydrogen.

4. The pipeline leakage detection method according to claim 1, characterized in that: In step S4, after the compressed gas and the tracer gas are mixed, the concentration of the tracer gas remains within the safe value.

5. The pipeline leakage detection method according to claim 1, wherein: Steps S6 and S7 are carried out in a relatively quiet surrounding environment to avoid the influence of environmental noise.

6. The pipeline leakage detection method according to claim 1, characterized in that: In step S7, the buried depth of the pipeline is predicted and determined before drilling to avoid damaging the pipeline during the drilling process.