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1
Content available Hydrodynamic performance analysis of a modified sandglass- -type FPSO in regular waves using boundary element method
Graylee Adeleh, Yousefifard Mahdi
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2020
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nr 64 (136)
25--35
EN
This paper presents a numerical investigation of the hydrodynamic performance of a modified sandglass-type FPSO (Floating Production, Storage and Offloading) with different geometrical parameters. The influence of the roll damping plate on heave and pitch motions of the FPSO was studied in regular waves. To estimate the hydrodynamic performance and utilize the results on the design stage of the FPSO, the boundary element method (BEM) was used. Furthermore, the hydrodynamic performance of two cylindrical and sandglass-type FPSOs under the same conditions was compared in different waves. Five sandglass-type FPSOs with dissimilar inclination angles were utilized with the constant draft. The effects of different inclination angles, including various radii of water-plane part of the floating object on hydrodynamic responses and wave forces applied to the FPSO, were investigated, and presented here. Numerical results were compared against published experimental data of a sandglass-type model, and good agreement was achieved. Based on the simulation results, a conclusion that a sandglass-type FPSO with the inclination angle of 35 degrees proposes proper hydrodynamic performance in both heave and pitch motions for all ranges of wave frequencies was reached. In addition, as it was predicted, the effect of heading sea on a sandglass-type FPSO was significant compared to other wave directions. Finally, by adding a damper plate to the floor of the platform, its hydrodynamic performance is improved. For numerical analysis of the modified FPSO, three different damper sizes are used to investigate its effect on the reduction of the pitch motion amplitude in waves.
2
Content available Assessment of buckling behaviour on an FPSO deck panel
Ozguc Ozgur
Polish Maritime Research
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2020
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nr 3
50--58
EN
Stiffened plates are the main structural building block in ship and offshore hulls and their structural response subject to loads is a topic of significant practical interest in ship and offshore structural design. To investigate the structural capacity for design and evaluation purposes, it is becoming an efficient and reliable practice to carry out non-linear finite element (FE) analysis. The present study is to assess the buckling strength of a stiffened deck panel on an FPSO vessel using the nonlinear finite element code ADVANCE ABAQUS, where imperfection sensitivity work is also accounted for. The cases studied correspond to in-plane bi-axial compression in the two orthogonal directions. The findings are compared with the DNVGL PULS (Panel Ultimate Limit State) buckling code for the stiffened panels. It is found that the strength values from the ADVANCE ABAQUS and DNVGL PULS code are very close. The results and insights developed from the present work are discussed in detail.
3
Content available A comparison between conventional buoy mooring CBM, single point mooring SPM and single anchor loading SAL systems considering the Hydro-meteorological condition limits for safe ship’s operation offshore
Rutkowski G.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2019
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Vol. 13, no. 1
187--195
EN
The purpose and scope of this paper is to describe the characteristics and make comparisons between: Conventional Buoy Mooring (CBM), also referred to as Multi-Buoy Moorings (MBM), Single Point Mooring (SPM) and conventional Single Anchor Loading (SAL) systems considering the hydro meteorological condition limits enabling safe ship’s cargo and manoeuvring operation offshore. These systems (CBM, SPM and SAL) are typically used for short term mooring applications offshore associated with the offloading and loading of bulk liquid fuel tankers transporting refined and unrefined products of crude oil. The permanently moored vessels FSO/FPSO are excluded from this scope.
4
Content available Modelling of seakeeping ability of FPSO vessels
Cepowski T.
Zeszyty Naukowe / Akademia Morska w Szczecinie
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2011
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nr 25 (97)
13-20
EN
Problems concerning preliminary design of FPSO vessels are presented in view of their seakeeping ability. The article analyzes the presently applied approach in which seakeeping quality of FPSO vessels is taken into consideration and discusses possibilities of using this approach at the preliminary stage of design. Besides, the current approach used for predicting such phenomena as heaving, slamming and green water loading is discussed.
PL
W artykule przedstawiono problematykę projektowania wstępnego statków FPSO, biorąc pod uwagę właściwości morskie tych statków. W artykule przeanalizowano aktualnie stosowane podejście, dotyczące uwzględniania właściwości morskich statków FPSO i możliwości wykorzystania tego podejścia na wstępnym etapie projektowania. W artykule przedstawiono aktualnie stosowane podejście do prognozowania m.in. nurzań, slemingu i zalewania pokładu statków FPSO.
5
Content available Eksploatacyjna ocena nośności informacyjnej systemu nadzoru pracy pomocniczej turbiny parowej jednostki pływającej typu FPSO
Adamkiewicz A., Rutkowski J.
Postępy Nauki i Techniki
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2011
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nr 11
5-15
PL
Artykuł dotyczy szczególnego przypadku niesprawności turbiny parowej napędzającej prądnicę w układzie energetycznym pływającej jednostki produkcyjno-magazynująco-przeładunkowej typu FPSO. Niesprawność, jaka wystąpiła w jednym z turboparowych zespołów prądotwórczych została ujawniona przez automatyczny system nadzoru. Przedstawiono jej lokalizację, skutki oraz sposoby i efekty prób jej usunięcia. Ustosunkowano się do możliwych przyczyn zaistniałej sytuacji. Na przykładzie wybranego, szczególnie trudno rozpoznawalnego uszkodzenia eksploatacyjnego, wykazano konieczność stosowania zaawansowanych inteligentnych systemów nadzoru pracy.
EN
This article relates to a particular case of unserviceability of a steam turbine which drives a current generator in the electric power system of a floating, production, storage and offloadingunit, FPSO type. The unserviceability, which has occurred in one of the power electric turbine sets, has been revealed by an automatic control system. Its localization, consequences, means and results of at-tempts of its elimination have been presented here. Possible causes of such unserviceability have been discussed. The necessity to apply most advanced intelligent control systems has been indicated.on the basis of a chosen, exteremely difficult to identif, operational fault.
6
Wybrane problemy projektowania wstępnego statków FPSO
Cepowski T.
Logistyka
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2011
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nr 3
PL
W artykule przedstawiono problematykę projektowania wstępnego statków FPSO, aktualnie stosowane kryteria oraz ograniczenia projektowe tej grupy statków istotne z punktu projektowania wstępnego. W artykule przeanalizowano aktualnie stosowane podejście dotyczące uwzględniania właściwości morskich statków FPSO i możliwości wykorzystania tego podejścia na wstępnym etapie projektowania. W pracy zamieszczono statystyczne wartości parametrów projektowych nowobudowanych statków FPSO, które mogą być przydatne na wstępnym etapie projektowania.
EN
The paper presents the preliminary design issues of FPSO vessels, the currently used criteria and design constraints of this group of vessels relevant to the preliminary design stage. The paper examines the approach for taking into account the FPSO seakeeping properties, and the possibility of using this approach to the preliminary design stage. The paper presents statistical values of design parameters new-builded FPSO vessels, which may be useful at the preliminary design stage.
7
Content available remote Systemy ewakuacyjne morskich instalacji wiertniczych i produkcyjnych - problemy operacyjne
Abaramowicz-Gerigk T., Burciu Z.
Górnictwo i Geoinżynieria
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2011
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R. 35, z. 4/1
31-39
PL
W artykule przedstawiono problemy operacyjne związane z wykorzystaniem systemów ewakuacyjnych morskich instalacji wiertniczych i produkcyjnych, ze szczególnym uwzględnieniem ostatniej fazy ewakuacji. Omówiono charakterystyki systemów wpływające na proces ewakuacji i podkreślono znaczenie znajomości charakterystyk bezpieczeństwa środków ratunkowych. Zaproponowano funkcję bezpieczeństwa dla tratwy ratunkowej.
EN
The paper presents operational problems of evacuation systems used on board offshore drilling and production installations, especially with respect to the final stage of evacuation process. The systems characteristics influencing the evacuation process have been described and significance of knowledge of safety characteristics of life saving appliances has been emphasised. The safety function for the life raft has been proposed.
8
Content available The modeling of seakeeping qualities of Floating Production, Storage and Offloading (FPSO) sea-going ships in preliminary design stage
Cepowski T.
Polish Maritime Research
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2010
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nr 4
3-12
EN
This paper presents an analysis of a presently applied approach to accounting for seakeeping qualities of FPSO sea-going ships and possible using it in preliminary design stage. Approximations of heaving, pitching, green water ingress on the deck and slamming of FPSO ships, based on main ship design and wave parameters, are presented. The approximations were elaborated with the use of the linear regression method and theory of artificial neural networks for a very wide range of FPSO ship dimensions and hull forms. In the investigations ship operational conditions were limited to those occurring in real service of FPSO ships, described by means of the so called operational scenario. Such approach made it possible to reach simultaneously high approximation accuracy and simple structure of mathematical model.
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