The decommissioning of offshore fields includes pipelines, flexible flowlines, umbilical lines, and other subsea infrastructure. Decommissioning decision makers often need to determine the best and most practicable options for these structures, including leave-in-place strategies or removal. Collectively, pipelines can be constructed from several different materials, including steel and plastics, and other metals (i.e., stainless steel and copper). This study presents results from several evaluations of pipelines, flowlines and power cables using state-of the science methods such as NEBA, HHERA, and CEA to support the determination of the environmentally superior decommissioning options.

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