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In a double pig system, two pigs with or without intervals move in the same direction or in opposite directions in the pipeline. The double-pig system is composed of a pig launcher, a pig stopper, 2 pigs, and a receiving station. The pig launcher is the home base of the pigs, it can contain 2 pigs. In the initial stage, two pigs can be placed in one station, or one at each station.
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