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Pigs are supporting equipment for pipeline cleaning. Pigs for Pipeline Cleaning are driven by gas, liquid, or pipeline transmission medium. It can carry other auxiliary equipment to complete various complex pipeline operations. Without pigging technology, it is impossible to carry out pipeline construction and operation. Only pigs can accomplish a lot of work economically. Therefore, pipeline technology and pigging technology are inseparable.

Disc pigs are widely used in petroleum, chemical industry, gas, water transportation, printing and dyeing, food, and other fields. It is necessary special equipment for pipeline construction, cleaning, maintenance, protection, detection, and management. Using pigging valves and cooperating with corresponding pigs can more easily complete the work of pipeline cleaning, emptying, isolation, and orderly transmission of media. During pigging operation, it can be used only by connecting the air compressor to the launcher. Its disadvantage is poor sealing. Once gas leaks from the gap between the pig and the inner wall of the pipeline, the back pressure immediately decreases significantly. At this time, the pig may stagnate.