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Bi-directional pigs are designed to be used for the displacement of water or air during hydrostatic testing and are commonly used throughout pre-commissioning of a newly constructed pipeline as well as during routine cleaning.
As standard, the pigs are supplied with two support/guide discs which assist with loading and centralisation in the pipeline and four sealing discs which drive, seal and scrape. Extra discs can be added if the scraper is to be used over long distances (>150km) or the pipeline conditions are particularly arduous.
Bi-Directional pigs are symmetrical so they can travel through a pipeline when pressurised from either side. This also allows them to be pushed back by reverse pressure should they get stuck. They have the highest recovery rate of all pig types and come with replaceable disks and accessories for cost effective operation.