Green water along the side of an FPSO

Title

Green water along the side of an FPSO

 Author

Werter, R.

Contributor

Huijsmans, R.H.M. (mentor)

Faculty

Mechanical, Maritime and Materials Engineering

 Department

Marine & Transport Technology

 Date

2016-10-04

 Abstract

Green water has a significant effect on safety and on structural strength of an FPSO. Green water mostly occurs at the bow of an FPSO because of the weathervaning capability. When the waves, current and wind are not co-directional, it can occur that waves are coming in on the side of the FPSO. When designing an FPSO for a benign environment, classification society rules are available to determine the measures which have to be considered against green water along the side. When the probability of green water and the freeboard exceedance along the side are actually known, no potentially unnecessary measures, implied by classification society regulations, have to be implemented on the FPSO. This study dealt with the probability of green water occurrence and most probable maximum freeboard exceedance along the side of the Petrojarl 1. Specifically, the effect of the various ship motions and the free surface elevation on the probability of green water are researched. The probability of green water occurring along the side of the Petrojarl 1 is analysed with linear 3D diffraction theory. The analysis is performed for the conditions in which the vessel will be operating. The probability is based both on the second order Forristall distributionand the linear Rayleigh distribution to determine the effect of the distribution on the probability of green water occurrence, because the Forristall distribution accounts for the second order wave effects in the incoming wave. The free surface elevation along the side of the FPSO under a certain relative wave angle proved to be of great importance. Therefore the free surface elevation is validated with measurements performed at MARIN for the free surface elevation along a plate. Finally, the relative wave angle also affects the probability of green water. This study dealt with the influence of the relative wave angle for the green water probability along the side of the Petrojarl 1.

 To reference this document use:

http://resolver.tudelft.nl/uuid:ee9e7e68-bc01-4398-98f5-de7b80afafbb

 Embargo date

2016-10-04

 Part of collection

Student theses

 Document type

master thesis

 Rights

(c) 2016 Werter, R.
Files
PDF Green_water_along_the_sid ... n_FPSO.pdf 6.42 MB
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