When a section of pipeline needs to be repaired, inspected, or serviced, a device called a “pig” is used. Named after the sound the first devices made – like the squeal of a pig (the animal) – as they traveled through early pipelines over a century ago, pig devices fall into two categories: utility and ILI. Utility pigs clean, separate, or remove water from a pipeline, while ILI pigs provide information on the condition of the pipeline as well as the extent and location of any problems. Since their development, “pipeline pigging” refers to using such devices in pipelines, and pigs or “pigging products” refer to the devices themselves and any required accessories.