Abstract
Designing a fixed offshore jacket platform requires the approximation of wave forces acting on jacket members which is influenced by multiple factors such as wave height, wave period, shape and size of the jacket member. An important part of determining wave forces using Morrison’s equation is the accurate determination of hydrodynamic coefficients. The presence of sacrificial anodes increases the hydrodynamic coefficient of jacket member and therefore this research focuses on improving the design of fixed offshore platforms by conducting experimental investigation on rigid cylinders in order to obtaining better estimates for hydrodynamic coefficients. Steel members of size 27 and 34mm diameters were tested in the wave basin 20 m x 10 m x 1 m. Different set of regular waves with varying height and frequency were generated. Clean members were fitted with small welded steel bars of fixed length and size along the member simulating sacrificial anodes. The results show that the coefficients obtained were close to the values proposed by PTS and API standards but are generally lower than the suggested value of 2.0 for both C d and C m .
Highlights
Offshore structures face various environmental loads, interactions and dynamic responses on top of their static loads which cause the calculation of hydrodynamic forces more complex
There is no single parameter with which the drag and inertia coefficients may be correlated without the need for other parameters, showing the complexity of the determination of hydrodynamic force coefficients [2]
It can be seen for the most part both mass and drag coefficients were higher in anode fitted member when compared to clean members but the changes were more significant in drag coefficients
Summary
Offshore structures face various environmental loads, interactions and dynamic responses on top of their static loads which cause the calculation of hydrodynamic forces more complex. The wave and current forces acting on these platform members are evaluated using the hydrodynamic drag and inertia coefficients, assumed as constant at all locations on these members for all the wave periods. There is no single parameter with which the drag and inertia coefficients may be correlated without the need for other parameters, showing the complexity of the determination of hydrodynamic force coefficients [2].
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