Rescuing a stalled cleaning pig isn't usually on the pre-pipeline isolation to-do list. After all, most pigs travel through pipelines without a hitch, doing their job of improving throughput across thousands of miles of line each day. So, when a third-party vendor's bi-directional (Bi-Di) cleaning pig stalled in the production tee of a 28 in. natural gas export pipeline offshore southeast Asia, it came as a surprise to the operator.
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