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given in relation to fatigue analysis based on fatigue tests and fracture mechanics. Reference is made to Annex C for practical details with respect to fatigue design. The aim of the fatigue design is to ensure that the C/WO riser has an adequate fatigue life. Calculated fatigue lives can form the basis for a fatigue crack inspection programme during fabrication and the service life of the C/WO riser. All cyclic load effects imposed during the entire life that have magnitude and number large enough to induce significant fatigue damage effect shall be taken into account; see 6.3.4.4. All modes of operation, including open-sea mode and tubing hanger mode (inside marine riser) and temporary conditions like running and hang-off, should be considered.
As a minimum, fatigue analysis shall be performed in connected conditions for open-sea mode and tubing hanger mode (operation inside marine riser) when appropriate. 97 (c) ISO 2005 - All rights reserved 97 ISO 13628-7:2005(E) Recommended Practice 17G / ISO 13628-7 C/WO risers should be designed so that vortex-induced resonant vibrations are prevented, whenever practical. Vortex suppression devices may be used as a method to minimize the strength of vortex-induced resonant vibrations; for further details, see API RP 2RD [2]. Fatigue-sensitive points shall be identified and a fatigue analysis shall be performed asme pdf for each point. Emphasis should be on bolts, welds and details with stress concentrations, in addition to locations with high surface roughness and surface marks. If there is a significant risk of fatigue failure, the design should be reviewed to reduce the risk by considering changes to the configuration to lower peak stresses, e.g. by reducing girth weld eccentricities, the provision of smooth profiles, particularly at welds, and the use of less susceptible materials. The fatigue life may be calculated by methods based on cumulative damage and/or crack growth analysis. Normally, the methods based on cumulative damage should be used during asme pdf design for fatigue life assessment due to its simplicity and efficienc
