TDW's BiDirectionAll Pig is designed to be used in pipeline construction during the hydrostatic test phase for air or water displacement applications. This pig is bidirectional, which allows the pig to run in either direction. It is designed to allow the user to fill the line with hydrotest water and then displace the water without having to remove the pig. It can be used as a bidirectional cleaning pig by adding optional brushes.
Each pig is equipped with six discs. The lead and trailing discs are the guide/support discs, which provide support to the pig. Since the outside diameter of the guide disc is smaller, it eases the loading of the pig by providing a guide.
Each pig is equipped with four scraper/seal discs, which provide an excellent seal during a new construction displacement application. The discs have also proven to provide excellent scraping action for cleaning purposes.
All discs are made from TDW's special polyurethane material designed to provide an excellent seal and long wear. The guide/support discs are slightly harder than the scraper/seal discs to enhance the pig's performance.
The BiDirectionAll Pig may be run in either direction if the application requires. The seal/scraper disc will easily reverse its seal position when the flow direction is changed.