Mooring Line Reliability Analysis of Single Point Mooring (SPM) System under Extreme Wave and Current Conditions
Authors
Abstract:
Single Point Mooring (SPM) is a type of offshore facility that is used for the loading and unloading of oil and gas tankers in the sea. In Iran, it is briefly called “floating buoy”. The present study discussed floating type, fixed to the seabed with mooring chain. The mooring chain of SPM, which is considered one of the important parameters of its design, will be evaluated with regard to reliability in different environmental conditions. Reliability is the likelihood of a healthy and flawless functionality for a specific time according to existing and predetermined conditions. OrcaFlex Ver. 9.4e (UK) software, by Orcina Company was used for moorings analysis. For this purpose and to calculate the environmental forces in the mooring chains (in our case 6 mooring chains with a 60 degree angle), the researchers used the diffraction analysis and time history. The results revealed that; by decreasing and increasing the diameter of the mooring chain, the force applied to the mooring also decreased and increased, respectively. Also, the effects of chain diameter, direction, and amount of wave and current were studied. The behavior of wave and current showed that when the direction of the wave and the current were closer to the direction of each mooring chain, the force applied to the mooring increased. To calculate the reliability, the FORM method was employed, and to find the target point on the function, the MPP method was used. The reliability of mooring was intended to control, the value of reliability index (β), using a software program written in MATLAB, for the environment loads with a return period of 100 years. The reliability index for mooring lines of SPM was greater than 3.51, representing the safe performance of the mooring lines under environmental load.
similar resources
Dynamics of a Single Point Mooring Marine Aquaculture Cage as a Simple Vibrating System
The increasing world demand for fish cannot be met by capture fisheries. Aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. The design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. Each design is site-specific and knowledge of the topography, wind force and direct...
full textComplex Dynamics of Slack Mooring System Under Wave and Wind Excitations
In the present study, stability analysis of a multi-point slack moored buoy is performed under the action of wave and wind forces. The effect of non-linearities due to hydrodynamic damping, geometric nonlinearity due to mooring lines, nonlinearity due to restoring force and excitation force have been considered.. The dynamic analysis is done using time domain integration scheme. The wave force ...
full textA Study on SPM Mooring System for Side-By-Side Two Vessels
In this paper, a new side-by-side mooring bay designed by Keppel Offshore & Marine Technology Centre is investigated, and its global performance and dynamic stability are compared against those of the traditional SPM-mooring system. The multi-body systems include SPM buoy with a turntable and mooring system, a VLCC FPSO, oil tanker, and the hawsers/fenders and yokes between them. A time-domain ...
full textdynamics of a single point mooring marine aquaculture cage as a simple vibrating system
the increasing world demand for fish cannot be met by capture fisheries. aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. the design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. each design is site-specific and knowledge of the topography, wind force and direction, p...
full textHydrodynamic Frequency Analysis of a Uniformly Moored SPM in Persian Gulf Environment Using Numerical Method
Single Point Mooring (SPM) are floating Structures that are deployed in deep water which their duties are vessel mooring and transferring oil and gas productions by pipelines from shore to petroleum tankers and conversely. One of the most important components of SPM is mooring system. Which bears not only environmental loads but also petroleum tanker loads which conducted by two thick ropes. Mo...
full textInvestigating the Behavior of the Mooring System for a Conceptual Design of a Spar Floating Wind Turbine under Survival Conditions
In this paper, selecting of an appropriate mooring system for spar platform of a wind turbine consisting of chain–cable–chain is investigated based on a meta-heuristic method. The purpose is to investigate the hydrodynamic behavior of the structure and the mooring system in a normal and damaged conditions. ANSYS-AQWA software is applied to hydrodynamics analysis and the numerical results were f...
full textMy Resources
Journal title
volume 9 issue None
pages 41- 49
publication date 2018-01
By following a journal you will be notified via email when a new issue of this journal is published.
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023