18 Pipeline Pigging in Oil and Gas Production Fields (@petrosult9821)

[@moohamahjubi388]

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[@JawaidIqbal-w7m]

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[@petrosult9821]

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[@ianinholland8390]

"PIG" does not stand for either "Pipeline Inspection Gauge" or "Pipeline Intervention Gadget" or any other such nonsense - they just look a bit like pigs, and the original ones were made of straw bals wrapped with barbed wire which made a loud squealing noise.