The problem Our client required a study of the interaction between a protection structure for a wellhead and shing gear. The structure had a protruding feature, which was designed to protect a tiein location for a number of months before the pipeline was connected to the manifold. The nal design had to meet the Norsok U-001 guidelines on overtrawlability. The solution We developed a scale model of the protection structure and a test procedure based on the client’s shing gear interaction studies. Preliminary tests identied a minor snagging feature. We then re- designed the structure to avoid catching, before the ume tank trials. Once the re-design had been implemented, scale model tests of trawl gear and nets passing over the structure were run at the ume tank. These were lmed on thr

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