Steel Catenary Riser Fatigue Life Prediction Using Linearized Hydrodynamic Models - World Journal of Engineering and Technology

WJET > Vol.5 No.4, November 2017

Steel Catenary Riser Fatigue Life Prediction Using Linearized Hydrodynamic Models ()

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Download as PDF (Size: 962KB) PP. 564-573

DOI: 10.4236/wjet.2017.54048 941 Downloads 1,982 Views Citations

Author(s)

C. Ebunuoha, C. V. Ossia^*

Affiliation(s)

Offshore Technology Institute, Faculty of Engineering, University of Port Harcourt, Port Harcourt, Nigeria.

ABSTRACT

Steel catenary risers, (SCR) usually installed between seabed wellhead and floating platform are subjected to vortex shedding. These impose direct forces, hence cyclic stresses, and fatigue damage on the SCR. Riser failure has both economic and environmental consequences; hence the design life is usually greater than the field life, which is significantly reduced by vortex induced vibration (VIV). In this study, SCR and metOcean data from a field in Offshore Nigeria were substituted into linearized hydrodynamic models for simulations. The results showed that the hang off and touchdown regions were most susceptible to fatigue failure. Further analysis using Miner-Palm green models revealed that the fatigue life reduced from a design value of 20-years to 17.04-years, shortened by 2.96-years due to VIV. Furthermore, a maximum wave load of 5.154 kN was observed. The wave loads results corroborated with those obtained from finite element Orca Flex software, yielding a correlation coefficient of 0.975.

KEYWORDS

Fatigue Life, Linearized Hydrodynamic Models, Steal Catenary Riser

Share and Cite:

Ebunuoha, C. and Ossia, C. (2017) Steel Catenary Riser Fatigue Life Prediction Using Linearized Hydrodynamic Models. World Journal of Engineering and Technology, 5, 564-573. doi: 10.4236/wjet.2017.54048.

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