The pressure pipeline is part of the pipeline and has a very wide range of uses. It plays a huge role in the transportation of various natural resources such as oil and natural gas, and involves all aspects of life. At present, the pressure pipeline can be divided into three types: oil and gas pipelines, public pipelines and industrial pipelines. The quality control is to ensure the normal supply of various resources and the safety of the living environment. As one of the non-destructive testing techniques, the application of radiographic inspection in the internal quality inspection of pipeline welds is more and more extensive, and its importance is self-evident. Therefore, it is of great significance to conduct in-depth research on non-destructive testing of pressure pipeline ray and to explore its quality control measures. This paper mainly analyzes the characteristics of pressure pipelines and related contents of non-destructive testing of radiation, and studies the quality control measures of non-destructive testing of pressure and pressure pipelines.
1. Main features of pressure piping
The pressure pipeline is a holistic system whose characteristics mainly include:
(1) There are many types and large quantities. Different from pressure vessels, in pipeline engineering, there are many links in related design, manufacturing, inspection, inspection and application management, and technical requirements and quality management are difficult. (2) Material selection is more complicated. There are many types of pipe components and supports, and each has its own characteristics and high technical requirements.
(3) The aspect ratio is large and it is extremely unstable. The fluid flow state in the pressure pipe is relatively complicated.
2. The concept of ray nondestructive testing
The so-called ray detection is mainly the detection using X-rays and γ-rays. The advantage of this detection method is that it is convenient and practical, and the detected object is not damaged, and the detection content can be saved for a long time after being converted into a digital result, and is used as a data reference for the next detection. However, this detection method also has certain drawbacks, that is, the radiation itself has radiation, which not only threatens the life and health of the testing personnel, but also causes the construction environment pollution to a certain extent. Non-destructive testing mainly refers to the use of sound, light, electromagnetic and other principles of the object, the detection of defects and problems in materials, parts, equipment, and does not affect or damage the performance of the test object. Compared with other detection methods, non-destructive testing has an irreplaceable advantage, and the test object can be repeatedly, large-scale, and large-area tested without any influence on the performance. In addition, non-destructive testing can also achieve comparative analysis of measurement defect parameters and test results, promote the safe use of products, and play a role in repairing design, improving production processes and improving product quality. Non-destructive testing of radiation is one of the non-destructive testing technologies. With the development of science and technology and the improvement of national industrial development level, the application of non-destructive testing of radiation in pressure pipelines has become more and more extensive.
3. Quality control measures for non-destructive testing of pressure pipelines
3.1 Pipeline single line diagram
The so-called single-line diagram of the pipeline is a method of drawing each pipeline according to the axis side and expressing the empty view of the pipeline by a single line. Its biggest function is to reflect the actual installation situation of the on-site pipeline, which is convenient for data preservation and provides traceability basis for various tasks such as pipeline inspection, which is conducive to the supervision and control of the construction process. In the process of pressure pipeline inspection, the relevant staff should prepare the pipeline single-line diagram management regulations according to the specific conditions, so that the pipeline single-line diagram can truly reflect the actual situation of the pipeline, and facilitate the process quality supervision and control. At the same time, the pipeline single-line diagram should be updated in time to ensure the dynamic management and control of various change parameters. Only by implementing strict dynamic management can the pipeline single-line diagram be corresponding to the actual installation of the on-site pipeline, and the discovery that the pipeline butt weld ray film reset does not match.
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