Case Study April 2016 Midstream Oil and Gas Solutions D352404X012 Abstract This paper explains the PipelineStudio simulation steps that were used by PGN in developing contingency plans for “off- spec” gas occurrence in distribution networks. It was triggered by occurrence of unplanned maintenance at the gas supplier’s processing plant and an obligation for PGN to maintain the delivered natural gas specifi cation to conform to the customer’s requirement during supplier’s unplanned maintenance period. Otherwise, supply issues could result for customers due to a main equipment trip caused by the off-spec gas. PGN developed a method to address these problems by altering the natural gas direction for supplying “on spec” gas to the customer. PGN developed a PipelineStudio simulation to

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