Oil Production Systems (OPS), Inc. is planning a subsea field development in a region in a water depth of nominally 1200m with subsea tree tied back to a floating production facility. The field will consist of moored deep draft semi-submersible. Produced fluids will be exported through existing export riser and pipeline to onshore processing and refining facility. The project tasks are to design a typical steel catenary riser (i.e., length, catenary profile and buoyancy requirements) so that: 1) The allowable stress is not exceeded. 2) The wall thickness meets the pressure requirement. 3) Provide loads at the riser interface (riser porch) to semisubmersible so that third parties can develop a flexjoint design and size the hang off split flange arrangement. 4) Only extreme conditions are to be considered at this stage.
The allowable stress is calculated to determine for the far and near cases will meet the code check for the riser though API-2RD & API 1111. The von mises equivalent stresses should be less than the allowable stress, the allowable stress is multiplied by the design factor given for the extreme and survival cases.