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vanishedone commented on the word pipeline pig
PPSA: 'Pipeline pigs are devices that are inserted into and travel throughout the length of a pipeline driven by a product flow. They were originally developed to remove deposits which could obstruct or retard flow through a pipeline. Today pigs are used during all phases in the life of a pipeline for many different reasons.
'Although each pipeline has its own set of characteristics which affect how and why pigging is used, there are basically three reasons to pig a pipeline...'
June 27, 2008