The dead end of the pipeline

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The dead end of the pipeline

The dead end of the pipeline

"Dead mouth" is colloquial. Two prefabricated pipe sections in the long-distance pipeline, for example, each have more than 10 km, and there is a break-point in the middle. At this time, the two prefabricated pipe sections are connected, and the last one in the middle is " Dead mouth ". Because it is difficult to align the nozzle and the nozzle with respect to the normal welded joint, the nozzle can not be moved freely in front, back, left and right. If it is summer, the prefabricated pipe section may be free to expand and contract for up to half a meter. In the morning, the two crossings may not be connected together. The weld is too wide to be welded. At noon, the temperature rises, but the two ends are stuck together, and it is still impossible to weld.

Long-distance pipelines are generally hundreds of kilometers or even longer, and are to be pressure tested in sections, especially in mountainous areas, with a drop of several hundred meters and a rough estimate of 10 meters at atmospheric pressure. If they are not sectioned, the pipes will be burst by hydraulic pressure . In this way, the connected port cannot participate in the pressure test. Now many people call the port that cannot participate in the pressure test, called the "dead mouth."