DESIGN AND FATIGUE ANALYSIS ON FREE SPANNING PIPELINE AT THE JAVA SEA

• Main Author: Rianto Wibisono - Nim: 15514073, Albertus
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25305
• Institution: Institut Teknologi Bandung

<p align="justify">The significant technology development in modern times has led an increase in energy demand, one of which is petroleum and natural gas as one of the energy that can be extracted from the offshore zone. Subsea pipelines for drilling of seabed wells need to be designed precisely to avoid failure, such as leakage of pipe wall because of not strong enough to withstand pressure that can cause contamination to surrounding ecosystem. The subsea pipeline design process including the design of wall thickness to withstand internal or external overpressure, prevent propagation buckling on pipes, and withstand combined loading that refers to DNV-OS-F101 standard. After obtaining wall thickness, continued with on-bottom stability analysis. This analysis aims to obtain the thickness value of the concrete coating as a ballast so the pipe can be stable vertically and laterally on the seabed and the analysis refers to DNV-RP-F109 standard. The design is continued with static installation analysis (without taking account the ship movements response) to obtain the most optimum lay barge configuration so that the pipe is layable with various type of vessels. Then continued with the calculation of the maximum allowable free span for static and dynamic conditions based on DNV-RP-F105 criteria. Free span that passed the fatigue screening criteria continued to fatigue analysis to prove the fatigue life value set by DNV standard. The fatigue analysis is also iterated to get the maximum free span that still meet the fatigue life design. All free spans are checked against the ultimate limit state criterion so as not to exceed the limits of material strength.<p align="justify">