Nondestructive testing device and method based on pipeline temperature field distribution

Abstract

The invention discloses a nondestructive testing device and method based on pipeline temperature field distribution. The nondestructive testing device comprises a testing device provided with a temperature sensor (1) which is arranged on the outer wall of a pipeline (2), wherein the testing device is connected with an instrument panel (3). The testing method comprises the following steps of (a) arranging the temperature sensor (1) on the outer wall of the pipeline to serve as a temperature testing point to count a temperature value; (b) obtaining the highest temperature value of tw2max, and averaging the front 75% of the rest of temperature values ranked from low to high to be tw2; (c) measuring the outer diameter of the pipeline, the inlet temperature of fluid in the pipeline and the temperature of air outside the pipeline, and respectively obtaining the thicknesses of the pipeline wall to be delta and delta' by utilizing the counted temperature values of tw2 and the tw2max and the fourier law; and (d) obtaining the thinning thickness of the pipeline wall through the formula: delta=delta-delta'. The nondestructive testing device and method can be widely applied into industrial fields of chemical industries, petroleum and the like, and have the unique advantages of being low in cost, fast, high in sensitivity, safe to operate and the like.

Description

technical field [0001] The invention relates to the field of pipeline non-destructive testing, in particular to a non-destructive testing device and method based on pipeline temperature field distribution. Background technique [0002] In industrial production, due to the long-term operation of many pipelines in the harsh working environment of high temperature, high pressure and chemical corrosion, the inner wall will often be damaged or fall off, resulting in the failure of the entire process to proceed smoothly and bringing hidden dangers to safe production. In recent years, Many major accidents in industrial systems are also closely related to the internal damage of pipelines. In the prior art, the following methods are often used for non-damage detection of pipelines: [0003] (1) X-ray flaw detection, which is a flaw detection method that uses X-rays to penetrate objects to find internal defects of objects. It can also be used to measure the thickness of objects. It i...

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Problems solved by technology

[0003] (1) X-ray flaw detection, which is a flaw detection method that uses X-rays to penetrate objects to find internal defects of objects. It can also be used to measure the thickness of objects. It is more common in industry, but because X-rays are harmful to the human body, so , during the flaw detection operation, the relevant safety operating regulations should be strictly followed, and the personnel around the pipeline should also take necessary protective measures to reduce injuries; , therefore, there is also the danger of high pressure during operation

[0004] (2) Ultrasonic (imaging) flaw detection, which uses ultrasonic energy to penetrate deep into the metal material, and when one section enters another section, reflection occurs at the edge of the interface to check the defect and thickness of the part. It is widely used in the metallurgical industry, but when it is applied to pipeline detection in chemical industry, petroleum and other industries, it is easily affected by the fluid in the pipeline, resulting in large errors; at the same time, the funds generated by using ultrasonic flaw detection are also more than the above methods. High, therefore, the penetration rate in chemical, petroleum and other industries is poor

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