The scope Petrogas E&P Netherlands owns and operates interests in the A and B Blocks in the Northern sector of the Dutch continental shelf. In 2015, Petrogas requested that we review the sphering strategy for one of the existing gas pipelines and a new gas pipeline soon to go into operation. Removal of liquids from gas pipelines is crucial for maintaining pipeline integrity. The liquids are a potential corrosion threat as well as having ow assurance implications if the quantity of liquid in the pipeline becomes excessive for handling at receipt. There is therefore a high importance on optimisation of sphering strategies for maintaining operability of pipeline systems whilst minimising the number of sphering operations required. The solution We reviewed the sphering run records of the exis

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