• (p. pr. & vb. n.) of Pig
Found on http://thinkexist.com/dictionary/meaning/pigging/
Pigging in the context of pipelines refers to the practice of using pipeline inspection gauges or `pigs` to perform various maintenance operations on a pipeline. This is done without stopping the flow of the product in the pipeline. These operations include but are not limited to cleaning and inspecting of the pipeline. This is accomplished by i..
Found on http://en.wikipedia.org/wiki/Pigging
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