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Title

Mooring Line Reliability Analysis of Single Point Mooring (SPM) System under Extreme Wave and Current Conditions

Year: 1396
COI: JR_IJMTE-9-1_005
Language: EnglishView: 37
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Authors

Behrouz Eghbali - Department of Marine Structures, Science and Research Branch, Islamic Azad University, Tehran
Mohammad Daghigh - Department of Marine Structures, Science and Research Branch, Islamic Azad University, Tehran
Younes Daghigh - Department of Marine Structures, Science and Research Branch, Islamic Azad University, Tehran
Farhood Azarsina - Department of Marine Structures, Science and Research Branch, Islamic Azad University, Tehran

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. ۹.۴e (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 ۶ mooring chains with a ۶۰ 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 ۱۰۰ years. The reliability index for mooring lines of SPM was greater than ۳.۵۱, representing the safe performance of the mooring lines under environmental load.  

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Paper COI Code

This Paper COI Code is JR_IJMTE-9-1_005. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1396980/

How to Cite to This Paper:

If you want to refer to this Paper in your research work, you can simply use the following phrase in the resources section:
Eghbali, Behrouz and Daghigh, Mohammad and Daghigh, Younes and Azarsina, Farhood,1396,Mooring Line Reliability Analysis of Single Point Mooring (SPM) System under Extreme Wave and Current Conditions,https://civilica.com/doc/1396980

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  • OGP (۲۰۱۰). Risk Assessment Data Directory – Storage Incident Frequencies ...
  • Faltinsen, O. M., (۱۹۹۰), Sea Loads on Ships and Offshore ...
  • Pecher, A. (۲۰۱۴). "Comparison and Sensitivity Investigations of a CALM ...
  • DNVGL-OS-E۳۰۱, (۲۰۱۵), Position Mooring. Norway, Det Norske Veritas ...
  • DNVGL-OS-E۳۰۲ (۲۰۱۵), Offshore Mooring Chain. Norway, Det Norske Veritas ...
  • Du.Xiaoping, (۲۰۰۵), Probabilistic Engineering Design-First Order and Second Reliability Methods, ...
  • TehranBerkeley, (۲۰۱۲), SPM Engineering Studies for Azadegan Extra Heavy Crude ...

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Scientometrics

The specifications of the publisher center of this Paper are as follows:
Type of center: Azad University
Paper count: 38,631
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