Water tightness detection device and method for pipeline

Abstract

The invention discloses a water tightness detection device and method for a pipeline. The water tightness detection device for the pipeline comprises at least two steel rings, wherein the periphery ofeach steel ring is sleeved with an air bag, the air bags can be tightly attached to an inner wall of the pipeline after being inflated, so an annular water pressing area is defined between every twoadjacent connected steel rings and the pipeline, a water inlet valve and a water pressure detection meter are arranged between every two connected steel rings; the water tightness detection method ofthe pipeline comprises steps of the connected steel rings being placed into the pipeline; the air bag being inflated so that the air bag is tightly attached to the inner wall of the pipeline, and an annular water pressing area being defined between the steel ring and the pipeline which are connected with each other; injecting the water into the annular pressurized-water area to a set water pressure value; closing the water inlet valve; and observing related reading changes of the water pressure detection meter and the water leakage condition of the pipeline to judge the water tightness of thepipeline. The device is advantaged in that the process of pipeline water tightness detection is simplified, the detection result is real and reliable, manpower and material resources are greatly saved, test cost is reduced, and the method is suitable for the field of water tightness detection.

Description

technical field [0001] The invention is used in the field of watertightness detection, and in particular relates to a watertightness detection device and method for pipelines. Background technique [0002] Water delivery steel pipes are usually welded together by multi-section steel pipes, and there is a circular weld between two adjacent steel pipes. The welding quality of steel pipes is affected by many factors such as steel chemical composition, crystallization form, welding process, and operator skills. Welding defects will occur, and most of the defects can be detected by ultrasonic flaw detection, radiographic flaw detection and other methods and processed by rework. [0003] In order to check whether the watertightness of the weld meets the requirements on site, the traditional inspection method is to conduct a closed water test of the entire pipeline, that is, to seal off both ends of the entire pipeline, inject water and pressurize the outside of the end, and check ...

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Problems solved by technology

[0003] In order to check whether the watertightness of the weld meets the requirements on site, the traditional inspection method is to conduct a closed water test of the entire pipeline, that is, to seal off both ends of the entire pipeline, inject water and pressurize the outside of the end, and check the change of water pressure over time The amplitude determines whether its watertightness meets the requirements. This detection method is complicated and requires a lot of manpower and material resources. Especially for deeply buried underground pipelines, it is very difficult to block, water injection, pressurization and drainage.

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