Positioning capability of anchor handling vessels in deep water during anchor deployment
Tóm tắt
The aim of this paper is to study anchor handling vessel (AHV) thrust capacity during anchor deployment, especially in a deep water situation when high external forces are expected. The focus is on obtaining realistic external forces and evaluating the positioning capability of an AHV. Wind, wave and current loads on the AHV are considered. Current load on the mooring line, which is usually excluded in practice, is included in the model as well. The thrust utilisation plot, a concept widely used in the Dynamic Positioning system, is proposed to illustrate the positioning capability of an AHV. The Bourbon Dolphin accident was investigated as a case study using the proposed model and methodology. First, load analysis was performed. The results indicated the importance of applying a reasonable current profile and taking the mooring line effect into account. Then, thrust utilisation plots for normal and accident conditions were compared. The comparison showed that the Bourbon Dolphin might have been in the most unfavourable weather direction in terms of position capability during the accident event. Finally, the effect of mooring line configuration was studied. The results signified that a very long mooring line might challenge the propeller thrust capacity and the propeller thrust loss due to lateral thrust usage needs to be considered. Such an analysis and documentation prior to the commencement of the operation can be used for defining vessel specific limitations and selecting the proper vessel for a specific task.
Tài liệu tham khảo
Saasen A, Simpson M, Ribesen B, Høj J (2010) Anchor handling and rig move for short weather windows during exploration drilling. In: The IADC/SPE drilling conference and exhibition, New Orleans
Lyng I (2008) Official norwegian reports: the loss of the “bourbon dolphin” on 12 April 2007. In: Technical report NOU 2008, vol 8. Royal Norwegian Ministry of Justice and the Police
Nielsen LG (2004) Casualty report: Stevns power capsizing and foundering during anchor handling operation on 19 October 2003. In: Technical report 199940518, Danish Maritime Authority
Gunnu GRS, Moan T (2012) Stability assessment of anchor handling vessel during operation considering wind loads and wave induced roll motions. In: The 22nd international offshore and polar engineering conference. ISOPE, Rhodes
Hukkelås T (2012) How to increase the safety during anchor handling operations?. Technical report, Kongsberg Maritime AS, Kongsberg
Gunnu GRS, Moan T, Chen H (2010) Risk influencing factors related to capsizing of anchor handling vessels in view of the bourbon dolphin accident. In: The international conference on systems engineering in ship and offshore design. Royal Institution of Naval Architects, Bath
Ritchie G (2007) Practical introduction to anchor handling and supply vessel operations, 2nd edn. Clarkson Research Services Limited, London
Gibson V (2009) Supply ship operations, 3rd edn. La Madrila Press, Aberdeen
IMCA (2000) Specification for DP capability plots. International Marine Contractors Association, London
Gonsholt A, Nygård B (2002) Dp design studies. In: Dynamic positioning conference. Marine Technology Society, Houston
IMCA (2009) International guidelines for the safe operation of dynamically positioned offshore supply vessels. International Marine Contractors Association, London
Augusto OB, Andrade BL (2003) Anchor deployment for deep water floating offshore equipments. Ocean Eng 30(5):611–624
Wennersberg LAL (2009) Modeling and simulation of anchor handling vessels. Thesis, Norwegian University of Science and Technology
MSS, Marine systems simulator (2010) Technical report. http://www.marinecontrol.org. Accessed 15 March 2011
Gunnu GRS, Wu X, Moan T (2012) Anchor handling vessel behavior in horizontal plane in a uniform current field during operation. In: Choo YS, Edelson DN, Mills T (eds) The 2nd marine operations specialty symposium. Research Publishing Services, Singapore
SIMO project team (2012) SIMO - Theory Manual Version 4.0 rev. 1, MARINTEK, Trondheim, Norway
Ormberg H, Passano E (2012) RIFLEX theory manual. MARINTEK, Trondheim
Faltinsen OM (1990) Sea loads on ships and offshore structures. Cambridge University Press, Cambridge
Naciri M, Sergent E (2009) Diffraction/radiation of 135,000 m\(^{3}\) storage capacity LNG carrier in shallow water: a benchmark study. In: The ASME 2009 28th international conference on ocean, offshore and arctic engineering. ASME, Honolulu
Wadam DNV (2010) Wave analysis by diffraction and Morison theory. In: SESAM user manual. Det Norske Veritas, Høvik
Blendermann W (1994) Parameter identification of wind loads on ships. J Wind Eng Ind Aerodyn 51(3):339–351
Ringen E, Moi S (2012) ShipX station keeping plug-in. MARINTEK, Trondheim
Zhou L, Moan T, Riska K, Su B (2013) Heading control for turret-moored vessel in level ice based on Kalman filter with thrust allocation. J Mar Sci Technol 1–11
Fossen TI (2011) Handbook of marine craft hydrodynamics and motion control. Wiley, West Sussex
DNV (2010) Recommended practice DNV-RP-C205, environmental conditions and environmental loads. Det Norske Veritas, Høvik
Rustad AM, Larsen CM, Sørensen AJ (2007) Deep water riser collision avoidance by top tension control. ASME, London
ISO (2005) International standard ISO 19901-1. Metocean design and operating considerations, 1st edn. In: Petroleum and natural gas industries—specific requirements for offshore structures. International Standard, Switzerland
DNV (2010) Offshore standard DNV-OS-E301, position mooring. Det Norske Veritas, Høvik