Although steel catenary riser (SCR) is an efficient riser concept for the deepwater oil and gas production, SCR on a Semi-submersible is susceptible to compression at the sag bend region that may lead to over stress under extreme environmental conditions such as 100-year and 1000-year return hurricane in Gulf of Mexico (GOM). It is one of the challenges to SCR design. The paper covers a wide range of SCRs, ranging from 6 inch to 20 inch outer diameter and including production and export SCRs, under the 100-year and 1000-year return hurricane conditions in GOM. Both linear and nonlinear analysis is performed. The non-dimensional compression and stress/strain coefficients are proposed, and they reveal excellent correlations between them and the compression force and bending stress/strain despite of the different riser size and weight. These coefficients can be used to determine the level of compression and bending stress/strain before the detailed and lengthy calculations, which are very useful as design guidelines. The acceptance criteria for GOM 100-year and 1000-year return hurricanes are discussed. It is recommended that for the nonlinear strain-based design the collapsed-based strain acceptance criteria are not conservative. More stringent nonlinear strain-based criteria are recommended, such as fracture mechanics analysis and accumulated strain analysis to ensure the integrity of the SCR during its life span.

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