It is well known that VIM response of a floater (Spar or Semi) significantly affects fatigue of moorings. VIM response characteristic of a floater is a key measure of its performance. A dry tree Paired-Column Semisubmersible (PC-Semi) platform has deeper draft and smaller columns compared to those of a traditional Deep Draft Semisubmersible (DD-Semi) platform. PC-Semi might have more pronounced VIM response due to its larger column slenderness. Thus, there is strong interest for us to explore VIM response characteristics of the PC-Semi and how these key features are compared to the other floaters. HOE performed a small scale VIM model tests at the UC Berkeley towing tank on May, 2012. This paper presents the key testing results and compares them against other floater VIM response curves. A typical loop current scatter diagram in GoM was employed and the measured VIM test results were adopted and applied for mooring fatigue analysis. A traditional DD-Semi was considered and analyzed to establish the base to gauge VIM performance feature of the PC-Semi. The comparison results of the PC-Semi and DD-Semi on VIM responses as well as the corresponding effects on mooring fatigues are addressed and highlighted.
Number of Pages
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.