Remove pig indicator with pressure

Removable Pig Signaller used in pipeline pigging operations are generally installed on the incoming and outgoing pipelines of long-distance pipelines. After long-term use, the ball indicator will have equipment corrosion and aging of the rubber seal ring of the movement. This will lead to different degrees of oil and gas leakage, indicator action failure, and other faults. The current solution is to shut down the pipeline. The operator will relieve and empty the oil and gas in the pipeline. And then repairing and replacing the indicator movement.
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