April 2021, Vol. 248, No. 4

Features

CASE STUDY: Free Span Assessment of Subsea Pipelines

Special to Pipeline & Gas Journal  Free spans on subsea pipelines are caused mainly by seabed irregularities, scouring and other factors such as movement of the pipeline during operation or the installation of artificial supports.   Chart: AIE Free spanning of subsea pipelines is a concern during both the installation and operational phase of the pipeline life and needs to be monitored to ensure the integrity of the pipeline.  Vortex-induced vibration (VIV) is one of the major sources of dynamic loads on free spanning pipelines. Because of the flow of wave and current around the free spanning pipeline, vortex shedding is generated

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