Two-step method verifies uprating of older German gas pipeline

03/01/2004
A two-step evaluation, using a classical deterministic method and a modern probabilistic one, verified uprating a 35-year-old German natural gas pipeline.Evaluation in the deterministic redesign focused on such aspects as material properties, defects in the pipeline and welds, fabrication tolerances, and a new calculation of maximum allowable operating pressure (MAOP).Each component was analyzed, resulting in a ranking list (weakest links of a pressure uprating), a fitness-for-service analysis for the pipeline, and a collection of significant input data for the probabilistic analysis.The probabilistic assessment analyzed the reliability of the existing system, again identifying the weakes...
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