August 2019, Vol. 246, No. 8

Pigging Update

Case Studies for Intelligent Pigging of Unpiggable’ Offshore Pipelines

By Edwin Rosier, Inspection Services, Intero Integrity Services BV, Netherlands Offshore pipelines are often challenging for pigging and inspection. Riser pipes are vulnerable and critical for the asset-owners, especially in the splash zone. Some pipelines end at a manifold (PLEM) or a buoy for loading ships. Sometimes wye-pieces are constructed in the line or different diameters occur.  Near the platform itself some difficult (unbarred) tee-pieces, back-to-back bends or factory 5D bends create challenging configuration that give ILI vendors a headache. And of course, the intern diameter of most pipes are smaller than average because of the heavy wall thicknesses due to higher pressures in

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