<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In the deepwater exploitation of oil and gas, replacing the polyester rope by a wire in the chain-wire-chain mooring line is proved to be fairly economic, but this may provoke some corresponding problems. Te aim of this paper is to compare the fatigue damage of two mooring system types, taking into account corrosion effects. Using a semi-submersible platform as the research object, two types of mooring systems of the similar static restoring stiffness were employed. Te mooring lines had the chain-wire-chain and chain-polyester-chain structure, respectively. Firstly, the numerical simulation model between the semi-submersible platform and its mooring system was built. Te time series of mooring line tension generated by each short-term sea state of South China Sea S4 area were calculated. Secondly, the rain flow counting method was employed to obtain the fatigue load spectrum. Thirdly, the Miner linear cumulative law model was used to compare the fatigue damage of the two mooring system types in long-term sea state. Finally, the corrosion effects from zero to twenty years were considered, and the comparison between the fatigue damage of the two mooring system types was recalculated.</p></abstract>

In the deepwater exploitation of oil and gas, replacing the polyester rope by a wire in the chain-wire-chain mooring line is proved to be fairly economic, but this may provoke some corresponding problems. Te aim of this paper is to compare the fatigue damage of two mooring system types, taking into account corrosion effects. Using a semi-submersible platform as the research object, two types of mooring systems of the similar static restoring stiffness were employed. Te mooring lines had the chain-wire-chain and chain-polyester-chain structure, respectively. Firstly, the numerical simulation model between the semi-submersible platform and its mooring system was built. Te time series of mooring line tension generated by each short-term sea state of South China Sea S4 area were calculated. Secondly, the rain flow counting method was employed to obtain the fatigue load spectrum. Thirdly, the Miner linear cumulative law model was used to compare the fatigue damage of the two mooring system types in long-term sea state. Finally, the corrosion effects from zero to twenty years were considered, and the comparison between the fatigue damage of the two mooring system types was recalculated.

Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect

Deepwater Engineering Research Center, Dalian University of Technology, Dalian, Chinab

State Key Laboratory of Coastal and Ofshore Engineering, Dalian University of Technology, Dalian, China

Polish Maritime Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect"}

In the deepwater exploitation of oil and gas, replacing the polyester rope by a wire in the chain-wire-chain mooring line is proved to be fairly economic, but...

Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect

Published Online: Oct 28, 2014

Page range: 68 - 76

DOI: https://doi.org/10.2478/pomr-2014-0032

Keywords
Mooring system, short-term sea state, fatigue damage, corrosion effect

© 2014 Dongsheng Qiao et. al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect

Published Online: Oct 28, 2014

Page range: 68 - 76

DOI: https://doi.org/10.2478/pomr-2014-0032

KeywordsMooring system, short-term sea state, fatigue damage, corrosion effect

© 2014 Dongsheng Qiao et. al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Mooring system, short-term sea state, fatigue damage, corrosion effect