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Advanced Search Free spans often become a challenge in pipeline design and operation due to pipeline installation on uneven seabed or seabed scouring effects.
The costs related to seabed correction and span intervention are in many projects considerable. Therefore it is relevant to investigate whether such intervention work is necessary or not. Despite the complexity inherent in free span response, the spans are often designed applying presumably conservative concepts and very simple analytical tools. The DNV guideline no 14 GL14 for free spanning pipelines was issued in and has later been updated and issued as an Recommended Practice DNV-RP-F to account for recent technical research and development and accumulated experience applying GL14 in pipeline projects.
This code allows vortex induced vibrations VIV as long as the pipeline integrity is ensured, by for example checking that the fatigue life is sufficient. By giving design methodology and acceptance criteria for fatigue, the DNV-RP-F approaches the real physics of free spans in a better way than older codes and makes it possible to select cost-effective methods both in the design phase and later when re-assessing spans in the operational phase.
Some examples of pipeline failures due to free span and vortex induced vibrations will also be presented. You do not currently have access to this content. Sign In.
DNVGL-RP-F105 Free spanning pipelines
DNV-RP-F105 (June 2017)