North Sea Pipelines-1: Extensive subsea commissioning, pigging pose challenges

Statoil ASA has installed and commissioned about 8,000 km of subsea pipelines in the North Sea area since 1985, including several of the world’s largest offshore gas trunklines. Commissioning and pigging these pipelines presented several challenges. Fig. 1 shows the main pipelines in the North Sea. Click here to enlarge imagePart 1 of this two-part series will discuss:• Commissioning concepts for single- and multidiameter pipelines.• Air drying of internally coated, export-gas-quality pipelines.• Dewatering of pipelines with hydrocarbon gas.Part 2 will examine:• Pig design for dual-diameter pigging.• Environmental aspects of commissioning operatio...

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