top tension, and other relationships for various mean vessel offsets and mud weights. Output results are presented as parametric plots of top angle vs. ( As high drag loads, vortex-induced vibration of the riser pipe causes increased riser drag coefficients, causing larger riser angles.) For the input conditions, state-of-the-art riser analysis programs determine, evaluate, and calculate the riser’s deflected shape, angles, and stresses. Also, high current conditions have a much different influence on the riser than the storm conditions. Of importance is the fact that the operational limits for the nondrilling conditions are greatly less restrictive than those that apply for drilling conditions. 1.ġ-Year winter storm-connected, drilling 2.ġ0-Year winter storm-connected, nondrilling 3. RAOs of the vessel ( Table 14.2) and metocean conditions ( Table 14.3) were used with analysis carried out for the following conditions, one with extreme waves and the other with extreme current. The riser stack-up as previously stated in the previous section was modeled using a typical riser analysis program. Riser analysis for a connected riser configuration was conducted to determine if the top tensioning capacity is sufficient to support a riser in 9000 ft (2743 m) of water based on representative design metocean conditions, using up to 16 ppg (1917 kg/m 3) mud in a specific deepwater region.
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