The BiDirectionAll Series III batching pig, available in diameters from 16 inches to 60 inches, can run in either direction within the pipeline if an application requires it. Because TDW equips each pig with four scraper/seal sets, it provides a highly reliable seal. The seal sets easily reverse their seal position when the pig’s flow direction is changed.
The pig’s ability to run in two directions has proven extremely valuable during hydrostatic testing as well: it allows the user to fill the line with water and later, displace it, without the need to remove the pig, as when preloaded test heads are used.
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