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Effect of Mooring Lines on the Responses of Spar Platforms

Mohd Zin, Nur Azimah (2008) Effect of Mooring Lines on the Responses of Spar Platforms. Universiti Teknologi Petronas. (Unpublished)

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Abstract

Spar platform, a competitive alternative structure for deepwater oil field development is modelled as a rigid body with six degree -of-freedom, connected to the sea floor by multi-component catenary mooring lines, which are attached to the spar platform at the fairleads. Since this spar platform is quite new in deepwater exploration, a lot of studies and researches still need to be done. Therefore in this project, the different type of spar platforms as well as the dynamic responses of spar platform such as surge, heave and pitch are being analyzed and compared by using comparison method based on its different mooring lines configurations. The mathematical results by using Linear Airy Wave Theory, Pierson-Moskowitz Spectrum, Morison Equation and Motion Response Spectrum have been conducted. The frequency domain analysis and time domain analysis have been performed by choosing frequency within 0.05 - 0.3Hz and time series within 0 - 100 seconds. For Neptnne Spar Platform, the maximum profile obtained were 1.9 - 2m for surge, 0.78m for heave and 0.065radian for pitch. These values are within the permissible limits for offshore operations. Also, parametric studies have been made by using different number of mooring lines. It is shows that there is no significant effect on the surge and heave responses even though the stiffness increases as the number of mooring lines increases.

Item Type: Final Year Project
Academic Subject : Academic Department - Civil Engineering - Structures, materials and construction
Subject: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:24
Last Modified: 30 Sep 2013 16:24
URI: http://utpedia.utp.edu.my/id/eprint/7178

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