SPECIAL REPORT: New method assesses the risk of upheaval buckling for submerged pipelines

Alex AynbinderCronus Technology Inc.HoustonDavid BevilWorleyParsons GroupHoustonA new methodology assesses the risk of upheaval buckling and determines the required profile of the trench bottom as a bed for both subsea and onshore pipelines.The method uses as input data the design operating parameters of the pipeline (internal pressure and temperature differential) and soil properties. Variable parameters are depth of cover, thickness of concrete coating or concrete weight for overbend pipeline section, if required, and angle of turn and minimum elastic (free) bend radius, or the height of any hills to be crossed.BackgroundWhen a pipeline is operated at a temperature higher than tie-in an...

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