scholarly journals Analysis and simulation of a single buoy mooring system based on sea environment

2014 ◽  
Vol 17 (3) ◽  
pp. 146-155
Author(s):  
Quang Xuan Le ◽  
Hien Vo ◽  
Huy Huu Nguyen ◽  
Nhat Ly Minh Tran ◽  
Thang Toan Nguyen ◽  
...  
Keyword(s):  
Water Depth ◽  
Coastal Waters ◽  
Single Point ◽  
Maximum Load ◽  
Mooring System ◽  
Optimal Length ◽  
Floating Structures ◽  
Guidelines And Standards ◽  
Mooring Chain

Single Point Mooring (SPM) is of great use to offshore floating structures which are currently in use in Vietnam’s coastal waters. However, this country is facing the lack of the related guidelines and standards for analysis, simulation and design of SPM system. This fact is the rationale for this paper which is aimed to propose a procedure for computation of the effects of sea environment on a SPM system. Specifically, the procedure enables the identification of maximum load exerting on the mooring buoy. Then, such identification together with the water depth parameter enables the determination of the optimal length and diameter of the desired chain. Finally, this paper presents a primary simulation of the mooring chain system according to various water depth conditions.

The Application of FPSO in Oil and Gas Exploitation

2012 ◽  
Vol 256-259 ◽  
pp. 1952-1955
Author(s):  
Ting Guo ◽  
Hong De Qin
Keyword(s):  
Oil And Gas ◽  
Single Point ◽  
Mooring System ◽  
Hydrodynamic Analysis ◽  
Comprehensive Review ◽  
Floating Structures ◽  
The World

The far-flung ocean has abundant resource and the exploitation area of ocean oil and gas is developing from offshore to deepwater and ultra-deepwater following the increase demand for oil and gas resource. Therefore, one of the floating structures for deepwater exploitation is FPSO. The yaw of FPSO is more important problem to solve. This paper use Hydrostar to compute the RAOs, 1st-order and 2nd-order force of FPSO. A comprehensive review is introduced about the research on FPSO hydrodynamic in the world, including the coupling hydrodynamic analysis of deepwater FPSO with the mooring system. The results indicate that the FPSO’s 1st-order force and moment is a little large, however, the RAOs and 2nd-order force and moment are good. The FPSO with single point mooring system can control the displacement of FPSO effectively.

Coupled Analysis of Floating Structures With a New Mooring System

2011 ◽  
Author(s):  
Zhiming Yuan ◽  
Chunyan Ji ◽  
Minglu Chen ◽  
Yun Zhang
Keyword(s):  
Water Depth ◽  
Deep Water ◽  
Coupled Analysis ◽  
Mooring System ◽  
Full Time ◽  
Analysis Method ◽  
Floating Structures ◽  
Motion Performance ◽  
Improved Performance ◽  
Hydrocarbon Reserves

As the exploitation of hydrocarbon reserves moves towards deeper waters, the floating structures are becoming more and more popular, and the catenary and taut mooring systems are two widespread mooring systems which are used for these floating structures. However, both of them have their inherent drawbacks. The aim of the present work is to develop and validate a new mooring system which will overcome these shortcomings. To this end, the motion performance of a semi-submersible platform is simulated by employing a full time domain coupled analysis method. It is shown that the new mooring system yields very good motion performance when benchmarked against the taut mooring system, and the reasons for this improved performance are discussed. Also, the new mooring system is compatible with the characteristic of catenary mooring system, which eliminates the requirement of anti-uplift capacity of the anchors. The second aim of this paper is to explore the proper water depth in employing this new mooring system. For this purpose, several typical water depths are simulated. It is found that the new mooring system works well both in deep water and ultra-deep water. But, as the water depth becomes deeper, the advantages of the new mooring system are reduced.

Hydrophysical parameters of seawater in front of Ustka during the summer season 2013

2017 ◽  
Vol 32 (1) ◽  
pp. 37-46
Author(s):  
Maciej Kałas ◽  
Ewelina Misiewicz
Keyword(s):  
Cross Section ◽  
Water Depth ◽  
Coastal Waters ◽  
Water Distribution ◽  
River Mouth ◽  
Water Density ◽  
Local Wind ◽  
Entire Cross Section ◽  
Directional Distributions

The article presents spatial distribution of hydrophysical parameters of coastal waters near Ustka, stretching towards the eastern part of Słupsk Bank which appeared there in July 2013. It covers studies of distribution of temperature, salinity and seawater density across the entire cross-section of the water depth. Additionally, directional distributions of the water flows recorded at Baltic Sea, as well as information on local wind speed and direction derived from numerical model of the atmosphere are presented. The resulting image of water density distribution across the entire cross-section of the water depth under steady conditions of stratification allowed determination of character and extent of river water distribution seawards of the Słupia River mouth during summer 2013

The Research of Mooring System of FPSO and its Application

2013 ◽  
Vol 437 ◽  
pp. 423-426
Author(s):  
Ting Guo ◽  
Hong De Qin ◽  
Bin Jiang
Keyword(s):  
South China Sea ◽  
Oil And Gas ◽  
Single Point ◽  
Mooring System ◽  
Hydrodynamic Analysis ◽  
Comprehensive Review ◽  
Floating Structures ◽  
The World ◽  
The Stability ◽  
Stable Area

The far-flung ocean has abundant resource and the exploitation area of ocean oil and gas is developing from offshore to deepwater and ultra-deepwater following the increase demand for oil and gas resource. Therefore, one of the floating structures for deepwater exploitation is FPSO. The yaw of FPSO is more important problem to solve, the mooring system can be reduce the yaw and improve the stability. This paper research the mooring system of FPSO in South China Sea. A comprehensive review is introduced about the research on FPSO hydrodynamic in the world, including the coupling hydrodynamic analysis of deepwater FPSO with the mooring system. The results indicate that with the mooring system the FPSO can drilling in stable area, because the mooring system provide huge load. The FPSO with single point mooring system can control the displacement of FPSO effectively.

Analysis on Motions and Green Water of FPSOs in Shallow Water With Non-Collinear Environments

2010 ◽  
Author(s):  
Bin Guo ◽  
Long Fei Xiao ◽  
Jian Min Yang
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Wind Waves ◽  
Single Point ◽  
Green Water ◽  
Floating Structure ◽  
Floating Structures ◽  
Head Waves ◽  
Run Up ◽  
Yaw Angle

The paper presents motions and green water of a FPSO in shallow water with different wave headings. In non-collinear directions of wind, waves and current, the FPSO does not always encounter head waves, which probably induces specialties in motions and green water especially because of the complexity of shallow water hydrodynamics. Time-domain numerical simulation and model test are carried out in order to analyze motions of a single-point moored FPSO. Green water and wave run-up along the side of a fixed FPSO are simulated in a 3-D numerical wave tank, and results are compared with that of model tests. It is shown that the influence of the yaw angle on motions of a FPSO is considerable and green water occurs more frequently around the mid-ship when the FPSO encounters a big wave heading. In the same water depth, roll and pitch motions of the FPSO under higher wave are lower instead but green water occurs; in the same wave situation, the motions of the FPSO in a lower water depth are lower, but green water occurs more severely. In general, water depth has an important influence on green water of FPSOs in shallow water. The hydrodynamic character of large floating structures in shallow water, especially the green water, should be taken into account carefully for determining the design load and freeboard of a large floating structure.

Wave Spreading and Wave Drift Loads for a Standard LNG Carrier in Shallow Water

2010 ◽  
Author(s):  
Emmanuel Sergent ◽  
Mamoun Naciri
Keyword(s):  
Natural Gas ◽  
Shallow Water ◽  
Natural Frequency ◽  
Water Depth ◽  
Storage Capacity ◽  
Mooring System ◽  
Spectral Densities ◽  
Floating Structures ◽  
Wave Drift ◽  
The Impact

The need for LNG export and import terminals is anticipated to grow as natural gas progressively accounts for a larger fraction of worldwide consumed energy. These terminals are preferably located nearshore i.e. in relatively shallow water. Design of floating structures is most of the time performed assuming long-crested waves. In shallow water, diffraction of waves by a variable bathymetry can result in wave spreading i.e. in short crested seas. The effect of short crested seas on the wave drift load spectral densities for a 135,000m3 storage capacity LNG Carrier in 15m water depth is investigated. It is shown that the impact of wave spreading on drift loads depends on the natural frequency of the moored vessel and thus on the stiffness of the mooring system under consideration. Although response calculations are not performed herein for reasons to be discussed, it is conceivable that wave spreading could adversely affect loading/offloading terminal availability for stiff moorings.

Urban Wastewater Discharge and Bacteriological Quality of Receiving Coastal Waters: Processes and Modelling

1993 ◽  
Vol 27 (12) ◽  
pp. 223-226
Author(s):  
J.-F. Guillaud ◽  
M. Pommepuy ◽  
E. Dupray ◽  
J.-C. Salomon ◽  
B. Thouvenin
Keyword(s):  
Coastal Zone ◽  
Coastal Waters ◽  
Wastewater Treatment Plants ◽  
Enteric Bacteria ◽  
Wastewater Discharge ◽  
Urban Wastewater ◽  
Bacteria Transport

The aim of this paper is to present some results of bacterial studies which were developed by IFREMER in coastal discharge areas of urban wastewaters; they are focused on the determination of bacterial inputs by wastewater treatment plants, the role of environmental factors on the enteric bacteria survival in the coastal zone, and the modelling of bacteria transport and disappearance in order to provide useful management information for minimizing faecal pollution in the coastal zone.

Qualification and Certification of Polyester Rope for Seabed Contact

2017 ◽  
Author(s):  
Øystein Gabrielsen ◽  
Kjell Larsen
Keyword(s):  
Water Flow ◽  
Water Depth ◽  
Test Method ◽  
Mooring System ◽  
Qualification Test ◽  
Mooring Lines ◽  
Norwegian Sea ◽  
Flow Through ◽  
Full Scale Tests ◽  
Certification Requirements

The Aasta Hansteen spar in the Norwegian Sea is designed to be moored with a taut polyester rope mooring system. The water depth at the field is 1300 meters, and due to the short installation season the most efficient hookup is with pre-installed mooring lines, which require the mooring lines to be laid down on the seabed. DNV certification does not allow seabed contact for polyester ropes unless proven that no soil ingress and damage takes place. To be able to certify the ropes Statoil developed a test method including contact with soil, rope movement and forced water flow through the filter construction. Full scale tests were performed with actual rope and Aasta Hansteen soil, both in laboratory and at site. This paper discusses the certification requirements and presents adequate qualification test together with results from testing.

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