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PILS phase II (pipeline, umbilical, cable and flexibles lateral stability)

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Øyvind Omland Øyvind Omland
Principal Engineer

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Buckle evaluation

Challenge

Weight coating or armoring to ensure lateral stability of pipelines, umbilicals and cables can be highly expensive; not only in terms of production but also in terms of storage, transportation, handling and installation.

Existing industry practice for on-bottom stability design in shallow waters is generally conservative. This often leads to increased cross-sectional weight or expensive seabed intervention.

Solution

This project aims to reduce overall conservatism by enabling dynamic on-bottom stability analyses in very shallow waters. We aim to use higher-order wave theories, and revisit acceptance criteria for lateral stability.

Powerful and efficient design software for dynamic FE time domain stability analyses, with tension stabilization and load correlation.

Benefits

Reduced necessary weight and reduced seabed intervention costs for pipelines, flexibles, umbilicals and cables while maintaining safe and reliable stability design.

Value

Over USD 300,000* can be saved by e.g. avoiding jetting of one 7 inch, 10km long subsea power cable.

*Based on a 16-day campaign including mobilization and de-mobilization. Day rate USD 20,000 (Low price, High-spec MPSV vessel). Source: http://www.scmdaleel.com/category/multi-purpose-support-vessel-mpsv/209 and previous experience.