smart pig
The other chief testing method involves running a robotic device through the interior of the pipe to detect any anomalies. This device, commonly called a "smart pig," has at times failed to catch flaws that later resulted in a rupture.
According to an article in American Speech, the journal of the American Dialect Society, oil workers called devices used to inspect or clean pipes "pigs" due to grunting noises they make while being forced through the pipes.
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