Nord Stream dry air purge improves nitrogen-slug use

Alessandro Terenzi Matteo Paglialunga Daniela Zenobi Saipem SpA Fano, Italy Marco Casirati Jarleiv Maribu Vladimir Borovik Nord Stream AG Zug, Switzerland Purging of precommissioning dry air from the Nord Stream offshore natural gas pipeline demonstrated the reliability of a simple nitrogen-slug shortening calculation model in estimating seal volume requirements and the validity of inert slug purging in large-diameter, long transmission pipelines. Commissioning a natural gas pipeline includes displacing the residual dry air used during precommissioning for dewatering and drying. This must occur before gas is introduced to begin normal transport. Pipeline companies use several methods ...

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