(1) Corrosion detection implementation of complex environmental conditions, serious interference
1 Differentiate from the other (such as water supply, drainage, heating, etc.) pipe network and communication, power and other cables in the same space, and distinguish them. It is difficult to identify the detection target (gas pipeline).
2 Buildings, houses, factory sheds and other cultural facilities such as flower beds, lawns, pools, etc. are densely distributed, and some even directly (in violation of regulations) cover the top of the pipeline; crowds are crowded, traffic flow is constant, the detection environment is very complicated, and the detection conditions change. Very large; in addition, cement or asphalt floors and pavements also limit the application of certain methods (such as air leak detection, etc.);
3 All types of interference are serious. Other (non-gas) buried pipelines and their ancillary facilities are the main sources of interference for detection information. In addition, there are also sky power, power and communication lines, industrial cruise currents, and interference bodies randomly appearing on the surface.
(2) There are many problems with the basic drawings and materials, and the maintenance records and documents are seriously incomplete.
The urban buried gas pipeline network system not only has complicated pipeline structure, but also has the characteristics of various pipe types, different anti-corrosion measures, different binding time and large span. Corrosion testing should be based on the identified pipelines (including various ancillary facilities of the pipeline), and must also refer to the relevant operational documentation, particularly fault data and maintenance records. Regrettably, due to historical reasons, the update speed of buried pipe network data in quite a few cities cannot keep up with the needs of construction and development: there is no complete underground pipe network distribution map and corresponding pipe network management database; or the drawings are outdated. The content indicated is very different from the current actual situation, the problem is too much to be practical or can not be used; the continuous and systematic pipe network operation document is lacking, and the maintenance record is scattered and seriously incomplete.
(3) A considerable number of detection methods are limited to complex detection environments and are difficult to implement.
The endoscopic detection technology such as magnetic flux leakage detection and acoustic detection in the tube can accurately describe the corrosion condition of the inner wall of the pipeline in the corrosion detection of long-distance pipelines. However, limited to the actual structure of the buried pipeline of the city (connection relationship) and the actual situation of variable diameter, slope change, change direction, deepening, etc., except for a small number of trunk pipelines, the endoscopic detection technology is difficult to implement. Other common detection methods, faced with complex detection operating environment and severe electromagnetic interference, must overcome the inherent difficulties of the method in addition to effective anti-interference measures. Other detection methods, including detection techniques based on infrared, magnetic, acoustic, and gas-sensitive principles, are also incapable or powerless in complex measurement environments.
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