SCR (steel catenary risers) are used in deepwater oil and gas developments to transfer produced fluids from the seabed to surface facilities. SCRs can be subject to fatigue loading from a variety of sources including wave and tidal motion, vortex induced vibration and operating loads. When the produced fluids are sour (contain water and H2S) higher FCGR (fatigue crack growth rates) are expected and therefore shorter overall life compared to performance in air, as a result of SSC (sulphide stress cracking). Successful design is critically dependent on the availability of appropriate experimental data to quantify the extent to which fatigue lives are reduced, and rates of fatigue crack growth are increased in a sour environment. The aim of this paper is to provide guidance on the current best practice methods for generating experimental FCGR data in a sour environment. Recent sour test data generated as part of this research is presented and the influence of a number of key variables is investigated including loading conditions, crack depth, specimen geometry, pre-soak and coating configuration.
An investigation into fatigue crack growth test methods in a sour environment
Eine Untersuchung über Ermüdungsrisswachstums-Prüfmethoden in einer sauren Umgebung
2009
8 Seiten, 12 Quellen
Conference paper
Storage medium
English
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