DESIGN CONFIGURATION OF STEEL LAZY WAVE RISER (SLWR) IN DEEPWATER

• Main Author: Maruf Nur (NIM 15512075), Akhmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20898
• Institution: Institut Teknologi Bandung

The riser system that streams production from the seabed to the host platform is one of the most important features in deepwater exploration. This riser behavior must be calculated as well as possible. This is due to extreme deepwater environmental conditions and coupled with the weight of the riser itself which adds to the accumulated loads that the riser must endure. Steel Lazy Wave Riser (SLWR) is an alternative that is now being developed in the Subsea field because this type of configuration can reduce the effects of host platform movement on the ocean surface to the risers movement on the touchdown area (TDA) on the seabed. Therefore, in this final project, static dynamic and fatigue analysis on SLWR will be permormed to obtain a robust configuration that meets DNV OS F201 reference code standard and for fatigue life at least 10 times from its design life ie 250 years at 1500 m depth with extreme environmental conditions. <br /> <br /> The analysis in this final project is entirely done with the computer using the help of the software. The software used is Orcaflex version 10.0. In Orcaflex modeling, models of all components involved in analysis such as FPSO, Riser in this case SLWR, fucntional and environmental forces should be modeled. After all functional data is entered then model is simulated with static simulation. Movements that occur in the hang-off point, where the Riser and host platform, the length and location of the buoyancy section and its combination with environmental conditions become the main focus in completing this Final Project. This static simulation result will become the reference point for the dynamic simulation. <br /> <br /> Furthermore, the modeling process continued with the input parameters stage of environmental parameters which are current data, wave, hydrodynamic coefficient, temperature, and soil data. After that the process continues into the simulation stage with various combinations of load cases in this case is called dynamic simulation. After the simulation process is completed, followed by the process of post processing. This procces is called the data collection process of simulation results for further analysis and in comparison with the permitted criteria. After the dynamic simulation meet the requirements DNV OS F201 code then the next fatigue modeling that also will be performed using Orcaflex software.