Among recent oil pipeline leaks in the United States, the 2010 Kalamazoo spill and the 2013 Exxon leak in Arkansas are the most glaring incidents, but these are just the big leaks that are found right away and reported.
Most leaks are found eventually, but there is money to be saved and damage to be avoided by catching them at the smallest rupture. Right now, the industry relies on pigs in the pipeline to do this.
This is called "pigging". Pigs are inspection gauges that can perform various maintenance operations on a pipeline _ from inspection to cleaning _ without stopping the pipeline flow.
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