Abstract

Abstract Umbilicals provide the critical link between remote subsea wells and fixed or floating production systems, providing control, power and communication services. Super duplex stainless steel (SDSS) umbilicals, designed for both static and dynamic applications, are now the preferred solution in wellhead control systems for deep water projects. The performance of the steel tube umbilicals (STU) is governed by the low and high cycle fatigue resistance of the seamless or seam-welded small bore SDSS tubes which act as the umbilicals tensile members. This paper presents data on the low and high cycle fatigue performance of seamless and seam-welded umbilical SDSS tubes. Axial high cycle fatigue test data from pre-strained samples is presented and compared with industry standard curves. In addition, the impact of increasing levels of plastic strain cycling on the material integrity and fatigue performance of steel tubes is presented with the aim of defining an acceptable level of plastic strain that is not detrimental to its integrity.

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