Maritime Park Journal of Maritime Technology and Society

Comparative Numerical Analysis Fatigue Damage Based On Variation In Quantities Mooring Line On Aker Smart 2 FPSO

Nur Salsabila Aulia, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

The Aker Smart 2 FPSO is the second FPSO from the Norwegian FPSO operator: Aker Floating Production, and will operate for Reliance in India. This FPSO will be moored with a mooring system catenary to the seabed. In its operation, the FPSO will be influenced by dynamic loads such as sea waves, ocean currents and wind on the mooring rope structure periodically. This may cause damage to the structure mooring line which influences the performance of the operational structure. The aim of this research is to investigate motion trajectory (surge & sway), mooring line stress, and deterministic fatigue on the mooring system catenary by making comparisons using variations in quantities mooring line. Dimensions mooring line type chain on fairlead with varying amounts mooring line namely 4x1, 4x2, and 4x3 which will then be analyzed fatigue damage-his. Numerical observations of FPSO motion on following seas, stern quartering seas, beam seas, bow quartering seas, and head seas show Response Amplitude Operator from movement surge, sway, heave, roll, pitch, and yaw due to harsh environments with Hs = 2.0 meters and T = 12 seconds. Observation Motion Trajectory it is found that the greater the number mooring line then value DOffset or movement surge & sway will get smaller. Meanwhile, in observation Mooring Line Stress and Fatigue Damage obtained both are directly proportional where the greater the tension mooring line the greater the damage. This is because the mass of the rope used is not proportional to displacement boat. And in this numerical analysis simulation it only reaches the initial movement, namely at 100 seconds, where the ship's condition has not yet reached the stable condition it should be.

Analysis of Motion and Mooring of Fpso Vessels Due to Different Types of Mooring Material

Sulkifli Saparuddin, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

Mooring is a system of anchoring offshore buildings or floating models in order to survive the threat of the marine environment so that they are held in position. catenary itself is a curve-shaped structure which is usually a cable or chain that hangs freely due to its own weight with both ends held. This paper uses a numerical method based on ANSYS Hydrodynamic Diffraction to analyze the motion of the mooring rope on the FPSO with the type of mooring rope material. So as to see the differences that occur from the type of meterial used, it is necessary to analyze the mooring motion.

Mooring Design and Fatigue Damage on Variant Fairlead Positions During FPSO Operation – Case Study

Mohammed Hussein Ba Naga, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

This comprehensive case study delves into the intricate dynamics of deepwater mooring systems, specifically focusing on Floating Production Storage and Offloading (FPSO) operations. Our investigation centers on the Anoa Natuna FPSO, situated in the Arafura Sea. We examine how varying fairlead positions, employing a 4x3 chain configuration, influence structural integrity, operational stability, and fatigue damage. The research meticulously analyzes the response of the FPSO to environmental forces, providing a detailed understanding of the vessel's behavior under different fairlead positions. The results showcase the vessel's stability, elucidate variations in its motion response, and highlight the effects of fairlead positioning on structural fatigue, offering valuable insights for safe and efficient deepwater FPSO operations.

Configuration Comparison Catenary Spread Mooring Line On The Movement Characteristics Of Fpso Ships Using Numerical Analysis

Fadhil Julyardiansyah, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

Abstract: FPSO (Floating Storage Production and Offloading) is a floating structure that can be used as a location for production, storage or offloading of offshore oil and gas. Therefore, FPSO plays an important role in the exploration of oil fields in the deep sea. When operating, the FPSO will be exposed to environmental loads that can cause it to operate flexibly. To reduce movement response and maintain the FPSO in position, a mooring system is needed. The aim of this research is to analyze the numerical results of this experiment to find RAO (Response Amplitude Operator) free movement (free floating) as well as motion trajectory (surge & sway), motion characteristics, mooring line stress based on variations in the number of ropes used when moored with the direction of loading (heading) from different directions with time domain 250 seconds for each identification. This comparison analysis uses software Boundary Element Method (BEM) with data on FPSO dimensions, type of rope and mooring system, as well as environmental loads that influence the movement of the FPSO structure. The results of the analysis obtained show that in essence the use of the number of mooring lines will greatly influence the movement characteristics, the trajectory/flow of the floating structure and the tension of the mooring ropes. Where, the fewer the number of ropes used, the greater the movement and tension of the resulting rope and vice versa. Usually due to the mass of mooring line which is influenced by the number of ropes not being the same or smaller than displacement FPSO and is also influenced by environmental forces or loads which have repeated patterns over a certain time so that the amount used mooring line must also consider all aspects of the environment in its planning.

Analysis of The Effect of mooring Depth & Fatigue Damage on Mooring Line FPSO Ship Azurite In The Masela Block

Anisa Eka Ramadani, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

Oil & gas drilling in the open sea cannot be avoided with the use of FPSO. Floating Production Storage and Offloading (FPSO) is a facility in the form of a floating production storage and unloading vessel in the form of crude oil and natural gas originating from the seabed. The selected type of floater that will be operated in the Abadi field, Masela Block, Arafura Sea is the Azurite FPSO ship. In its operation, the FPSO will not be separated from the influence of dynamic loads such as sea waves, ocean currents and wind on the mooring rope structure periodically. This may cause damage to the structure mooring line which influences the performance of the structure. The aim of this research is to analyze motion trajectory (surge and sway), mooring line stress, and fatigue damage on the mooring system catenary by making comparisons using variations in mooring depth. Dimensions mooring line type chain on fairlead with six (6) variations in mooring depth, namely 1000, 900, 800, 700, 600 and 500 meters which will then be analyzed fatigue damage from mooring line the. Observation result Motion Trajectory It was found that the shallower the mooring depth mooring line then value ∆Offset or movement surge & sway will get bigger. Meanwhile in observations Mooring Line Stress and Fatigue Damage obtained both are directly proportional where the greater the tension mooring line then the ratio of damage that occurs due to fatigue in the structure will also be greater. This is because the mass of the rope used is not proportional to displacement boat. And in this numerical analysis simulation it only reaches the initial movement, namely at 100 seconds, where the ship's condition has not yet reached the stable condition it should be.

Numerical Studies Fatigue Damage From Material Variations Catenary Mooring System FPSO Al Zaafarana

Bulan Purnama, Fuad Mahfud Assidiq — Tue, 27 Feb 2024 00:00:00 +0000

When operating, the FPSO receives environmental loads in the form of currents, wind and waves so mooring ropes are required (mooring line). Mooring line is a way to dampen the movement of the Al Zaafarana FPSO which allows it to move freely in the direction of the load. However, several cases of mooring rope accidents occurred including material fatigue of 20%, deployment 17%, and corrosion 11%. So the aim of this research is to analyze motion trajectory (surge and sway), mooring line stress, and deterministic fatigue on mooring line so you get it fatigue damage material catenary mooring line for FPSO Al Zaafarana. Thus, it is hoped that this research can make a scientific contribution in improving the quality and safety of materials mooring line for the Al Zaafarana FPSO, as well as increasing the efficiency of the oil drilling process. This research method uses a numerical study approach as a secondary data source with modeling and simulation using software as well as literature analysis that will support the numerical simulation results. From the results of numerical studies obtained fatigue damage The highest is the material type chain for FPSO Al Zaafarana. One of the reasons is that the mass of the rope is not proportional to the displacement of the ship, so a larger mass of rope is needed or an increase in the number of ropes. In addition, the numerical study simulation only uses 100 seconds so that the movement process only reaches movement transient namely temporary changes that occur in the transition phase before reaching a stable condition.

Development of Corrosion Resistant Welding Technology for Industrial Applications Study on the Impact of Material Variation and Welding Process

Aung Ye Kyaw — Tue, 27 Feb 2024 00:00:00 +0000

This article discusses the development of stainless welding technology aimed at improving corrosion resistance in industrial applications. The research focuses on the effect of material variation and welding process on the corrosion-resistant performance of welding joints. The research methodology includes the selection of materials with different compositions and the application of various welding techniques. Experiments were conducted to evaluate the microstructure, joint strength, and corrosion resistance properties of the weldments. The results show that material variation has a significant impact on the corrosion resistance of welding joints. The use of certain welding techniques can also affect the corrosion properties of the resulting material. Microstructure analysis provides an in-depth insight into the changes at the microscopic level that affect corrosion resistance. This study makes an important contribution in identifying critical parameters that need to be considered in the development of corrosion resistant welding technology to improve material performance in corrosive industrial environments. In conclusion, a better understanding of the relationship between material and welding process variations and corrosion resistance can help in designing more effective and durable welding technologies for industrial applications. This research has the potential to provide practical guidance for engineers and industry professionals in selecting optimal materials and welding techniques to address corrosion challenges in diverse work environments.