The pressure pipeline is a part of the pipeline. It is mainly responsible for the transportation, distribution, mixing, separation, discharge, measurement and control of various natural resources such as oil and natural gas. It can be divided into oil and gas pipelines, public pipelines and industrial pipelines. 1]. With the continuous development of social productivity and the continuous improvement of people's living standards, the application of pressure pipelines has become more and more extensive, and has become an indispensable and important part of people's lives in modern society. The safe operation of the pressure pipeline is directly related to the state property and people's life safety. The importance of the ecological environment construction is self-evident. Inspection and testing of pressure pipelines include: appearance inspection, non-destructive testing, hardness measurement, pressure resistance test, etc., and non-destructive testing of radiation is one of the non-destructive testing techniques, which plays a role in ensuring the stability of pressure pipelines and safely transporting fluids. Great role. Therefore, quality control of non-destructive testing of radiation is very necessary.
3.2 Treatment aspects of unqualified butt joints
The pressure pipeline is tested by the non-destructive testing method. If the test result is unqualified butt joint, it can be treated by local rework and re-welding. The treatment method should be determined according to the cumulative length and distribution of weld defects. If the defects are concentrated and the cumulative length is not long, local repair can be performed; but when the defects are too scattered, and the cumulative length is too long, and the repair is difficult, the re-welding can be selected [2]. At the same time, in order to ensure the welding quality of the butt welds of the pipeline, in addition to strictly controlling the re-welding treatment of the unqualified butt welds, the project supervisors must supervise them and generate corresponding materials, collate, archive and maintain. For some projects that are not commissioned, special personnel should be assigned to carry out special management to effectively control the welding quality of the butt welds of the pipeline. In addition, in order to ensure the quality of the project, independent third-party testing should also be carried out. The testing unit and the construction unit should ensure the scientific rationality of the test and prevent the existence of fraud by signing a contract.
3.3 Inspection personnel and testing institutions
The pressure pipeline testing unit and relevant testing personnel must have a qualification certificate, and must not be employed without a certificate. The relevant documents must be valid within the validity period to ensure the effective implementation of various inspections and provide a strong guarantee for the quality of pressure pipeline testing. Under normal circumstances, the minimum standard for force pipeline inspection units is qualified for RT inspection, while the inspection units with UT, MT, PT4 and other special equipment inspection and testing institutions are more qualified for inspection. In addition, it is necessary to pay full attention to the training of the inspectors to ensure that the inspectors meet relevant requirements in terms of understanding of the process documents, familiarity with the operation process, and the use of radiation protection equipment, thereby ensuring the quality of the inspection.
4. Supervised spot check on non-destructive testing of pressure pipelines
4.1 General spot checks
The quality of the filming operation, the quality of the darkroom treatment and the quality of the film evaluation are mainly checked and supervised. Among them, in the supervision of the operation of the radio film, the inspectors must strictly follow the process instructions and ensure the proficiency of the operation. In the supervision of the quality of the darkroom treatment, the timing and temperature of development, fixing, and drying are carefully observed, and relevant records are made. At the same time, it is necessary to check the safety light intensity of the red light and the layout of the dry and wet areas to ensure the rational use of resources. The supervision of the quality of the negative film is divided into two types: preliminary evaluation and re-evaluation.
4.2 related details in the spot check
In the inspection of pressure pipelines, the supervisors should carefully check the film for review. The standard of the spot check is: ≥30% of the non-return film and 100% of the repair film. If the problem is serious, the proportion of the spot check should be increased appropriately, increasing by about 10% [3] ]. In the process of spot checks, it is necessary to pay attention to the abuse of fake films, and conduct spot checks in a random selection manner. When comparing with the single-line diagram of the pipeline, it is necessary to conduct a key review of the fixed ports.
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