T o de-oil and hydrotest T A QA ’s 42km pigging loop where the lines had to be cleaned to below 30 parts per million (ppm) in water . A pigging programme to remove all wax and hydrocarbons from the line was actioned. As the lines were not in production, the 42km loop had to be pigged with flooding pumps using chemically-treated seawater. Samples were taken after every pig run and once the lines were cleaned to below 30 ppm oil in water, the

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