Pig:
1.A flow line clearing device, pumped through the line with normal flow.
2.
A scraping tool that is forced through a pipeline or flow line to clean out accumulations of wax, scale, and debris from the walls of the pipe.
It travels with the flow of product in the line, cleaning the pipe walls by means of blades or brushes affixed to it.
Also called a line scraper or a go-devil.
3.
A batching cylinder with neoprene or plastic cups on either end and used to separate different products traveling in the same pipeline.
4.
A neoprene displacement spheroid, automatically launched and received, used to displace liquid hydrocarbons from natural gas pipelines.
5.
In hydrostatic testing of a pipeline, a scraper used inside the line to push air out ahead of the test water and to push water out after the test.
