This paper presents a best practice guidance for establishing the design fatigue capacity of subsea connectors, both for air and for seawater with cathodic protection. The design fatigue capacity is established based on analysis and in-air full-scale connector fatigue testing. This best practice guidance is based on experience with the use of API 17G since 2006, recent updates of the fatigue design codes DNVGL-RP-C203 and BS 7608 and a review of a large number of in-air full-scale connector fatigue tests. This best practice guidance has been proposed to be included in Annex D of the 3rd edition of API 17G and in Annex B of the 5th edition of NORSOK U-001.

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