This paper is seeking to provide feedback on the use and application of both API-RP-17N & ISO 20815 in subsea field developments and in the progression of floating production system designs by presenting findings and design study recommendations, which are collectively pushing engineering boundaries in the recovery of oil and gas from difficult operational and environmental locations. Lessons Learned, key issues encountered and feed-back are provided from the installation of a subsea facility infrastructure that will deliver gas into the U.K. network from a long distance subsea tieback West of Shetland in the UK Continental Sector and from various FPSO projects and from deep-water FLNG design developments.

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