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Time histories of wave-in-deck loading on jacket decks
AuthorsKatrine van Raaij ; Ove T Gudmestad
Date published2005
AbstractFor more than a decade wave-in-deck loading on fixed surface piercing offshore structures has been an issue of concern for engineers and researchers dealing with the performance of such structures. Most researchers agree that wave-in-deck loading is of dynamic nature and that the dynamic effects on the structural response are important. However there exists no engineering practice for the determination of load time histories for waves hitting the decks of fixed offshore platforms. This applies to both the time variation and the magnitude of the loading. The main recommendations for wave-in-deck loading are presented with reference to wave tank experiments of a model of the Statfjord A Condeep platform subjected to extreme wave loading. The recommendations for loading from these tests comprise time variation as well as magnitude. These recommendations are used as a basis to suggest a simplified method to estimate wave-in-deck loading on jacket platform decks for which to the difference from Condeep platforms the wave height amplification due to the interaction between the incoming wave and the structure (Swan et al. 1997) is negligible. The resulting 'recipe' for wave-in-deck time histories on North Sea jacket platforms is compared to relevant results previously reported in the literature. The method is categorised as a 'global' approach that is one uses an effective deck area as opposed to a detailed deck model. The method is suggested to be applicable for analyses where a 'rough but reasonable' estimate for wave-in-deck loading is sufficient.
AuthorsKatrine van Raaij ; Ove T Gudmestad
Date published2005
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Conf on - In-Water Maintenance on Ships London 15 Jan 1975
PublisherIMarE Conferences and Symposia
Date published1975
PublisherIMarE Conferences and Symposia
Date published1975
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Conf on - training and distance learning on board ships 24 March 1982
PublisherIMarE Conferences and Symposia
Date published1982
PublisherIMarE Conferences and Symposia
Date published1982
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A study on human factors in engine room
AuthorsH Shiihara ; N Sumi
Date published2000
AbstractA study is presented which is carried out to determine the characteristics of human error that are supposed to happen daily in an engine room. The results show that the majority of machinery failure on ships less than about 10 years old is attributable to human error. However constructive defects have greater impact than human factors on major failure in ships over about 10 years old. Future research is proposed to find out which characteristics of human error has the greatest impact on breaking the chain of mistakes caused by human factors when constructive defects also exists.
AuthorsH Shiihara ; N Sumi
Date published2000
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Accident prevention on board ship at sea and in port
AuthorsInternational Labour Office
Shelf Location227b
AbstractThis code is published in response to a resolution adopted by the committee on accident prevention of a preparatory technical maritime conference that was convened by the International Labour Office in September 1969. The resolution recommended that an international code of practice on accident prevention on board ships at sea and in port be prepared.
AuthorsPublisherInternational Labour Office
Geneva: International Labour Office
Shelf LocationDate published227b
1978
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An experimental investigation of wave loads on a mat-like floating structure in waves with short length
AuthorsS Yamashita ; A Ito ; T Kabaya
PublisherAmerican Society of Mechanical Engineers - ASME
AbstractResults of a systematic series of wave-excitation tests to investigate the wave-induced loads on a very large floating structure are reported. The model consists of five identical module models; wave induced forces on each module were measured in regular and irregular waves with varying the incident angle of waves. Hydrodynamic pressure on the hull surface were also measured to examine the characteristic features of pressure distributions.
AuthorsDate publishedS Yamashita ; A Ito ; T Kabaya
1997
PublisherAmerican Society of Mechanical Engineers - ASME
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An Overview of Ice Loads on Slender Structures
AuthorsM E Johnston ; G W Timco ; R Frederking
Date published1999
AbstractThis paper presents in a concise and unified format the loads that have been measured on slender structures. Nine different structures have been examined and general information on the loads are presented. The data on slender structures indicate a maximum load of 2500 kN and show a reasonable correlation between the measured load and ice thickness. This correlation is encouraging since the data was collected from a wide range of structures that were in different types of ice regimes. In total it illustrates the load levels and general trends of load with increasing ice thickness for slender structures placed in ice covered waters.
AuthorsM E Johnston ; G W Timco ; R Frederking
Date published1999
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Analysis of drift force on VLFS by the near-field approach
AuthorsTomoaki Utsunomiya ; Eiichi Watanabe ; Naoyuki Nakamura
Date published2001
AbstractAnalysis of wave drift forces for a Very Large Floating Structure (VLFS) is presented. The drift force can be calculated either by the far-field method or by the near-field method. This paper focuses on the near-field method by which the drift force acting on the floating body alone can be calculated even when it is accompanied by breakwaters. Numerical examples for drift force on a VLFS close to a breakwater are presented where the effect of the breakwater is found to be remarkable.
AuthorsTomoaki Utsunomiya ; Eiichi Watanabe ; Naoyuki Nakamura
Date published2001
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Application of electric propulsion on a ro-ro ferry and on a chemical tanker
AuthorsJ D Wilgenhof
PublisherUniversity of Newcastle
AbstractResults of two research studies are presented which investigate the technical and economic feasibility of diesel electric propulsion systems compared with diesel mechanical system. Studies involved a ro-ro ferry and a chemical tanker. Different ship sizes were considered; other aspects involved are installed power fuel consumption maintenance engine room occupied space initial cost annual cost and annual revenues. Power demand was smaller than for the diesel mechanical system. There was no direct economic benefit.
AuthorsDate publishedJ D Wilgenhof
1997
PublisherUniversity of Newcastle
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Assessing the impact of an organic restoration structure on boat wake energy
AuthorsJean T Ellis ; Douglas J Sherman ; Bernard O Bauer et al.
Date published2002
AbstractAn attempt is made to assess the impacts of brush bundles on boat wake energy and to determine if the degree of effectiveness depends on water depth. Field work was conducted on Georgiana Slough in August 2000. This study found that brush bundles are an effective method to reduce potential boat-wake induced levee erosion. After some background information the experimental design is looked at. Next results are discussed.
AuthorsJean T Ellis ; Douglas J Sherman ; Bernard O Bauer et al.
Date published2002
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BSRA Report No. 332 Report on the Influence of 18/8 Austenitic Steel Surface Weld Deposits on the Performance of Mild-Steel Specimens Subjected to Cyclic Stress
AuthorsB K Batten ; G P Smedley
Shelf Locationin storage
AuthorsPublisherB K Batten ; G P Smedley
British Ship Research Association
Shelf LocationDate publishedin storage
1961
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Coastlines Structures and Breakwaters 2005 - Harmonising scale and detail; Proceedings of the International Conference on Coastlines Structures and Breakwaters organised on behalf of the Maritime Board of the Institution of Civil Engineers held London
AuthorsN W H Allsop
PublisherThomas Telford Publishing
AuthorsDate publishedN W H Allsop
20222005
PublisherThomas Telford Publishing
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Curtains on board for preventing spilt oil diffusion
AuthorsM Kubo ; K Asaki ; K Yamamoto et al.
Date published1997
AbstractA new device to prevent spilt oil diffusion in several minutes just after an accident is proposed. It encloses a hull with curtains with a depth nearly equal to the full load draft of the ship and sinkers are mounted on the foot of the curtain to be stabilized in the water. The effects of this device are discussed on the basis of some results of two-dimensional model experiments. Lastly a practical operation method of the device is presented resulting in a full scale experiment conducted on an actual ship.
AuthorsM Kubo ; K Asaki ; K Yamamoto et al.
Date published1997
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Experimental pressure investigation on a high-speed craft in waves
AuthorsK Garme
Date published2000
AbstractThe behaviour of high-speed planing craft operating in waves is characterised by large and violent motion. Slamming (severe water impact) can be expected at most wave encounters resulting in large rigid body acceleration and high local pressure. A model experiment on a planing high- speed craft in calm water regular and irregular waves is reviewed. The objective is to measure the pressure distribution and the transient accelerations together with the rigid body motions during severe but well-defined wave conditions. Results on slamming impact pressure and acceleration are given and examples on large model motions are shown.
AuthorsK Garme
Date published2000
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Guidelines on the use of oil spill dispersants
AuthorsInstitute of Petroleum
Shelf Location231a
AbstractDuring the last decade a considerable amount of research and development effort has been put into new methods to reduce oil pollution at sea, and particularly on oil spill dispersants and their means of application. This has resulted in formulation of highly efficient dispersant concentrates and compatible aerial spraying systems which have improved the response time to oil spills. This book takes into account the developments which have taken place since 1979. It is based largely on experience and legislation relevant to the UK, but the general principles will apply to most countries of the world.
AuthorsPublisherInstitute of Petroleum
Chichester : Wiley on behalf of the Institute of Petroleum, 1986.
Catalogue number628.1688309162
Shelf LocationDate published231a
1987
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High temperature pressure sensor based on thin film strain gauges on stainless steel for continuous cylinder pressure and injection pressure measurement
AuthorsS Neumann
Date published2001
AbstractCylinder pressure is the fundamental variable that determines a combustion engine’s operating state. The design and performance of imes long-life high-temperature thin film strain gauge pressure sensors are described. These have been specifically developed to monitor reciprocating compressors natural gas or diesel engines and high-pressure fuel systems.
AuthorsS Neumann
Date published2001
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Living with slugs on floaters
AuthorsI Das ; C Wordsworth ; G McNulty
PublisherIMarE Conferences and Symposia
AbstractConcerns raised about flexible risers are discussed including the problems associated with the occurrence of severe slugging in the riser and the resultant affects on the topsides separation equipment. Several test programmes which CALTEC has performed to determine the behaviour of slugging in pipelines and risers its affect on process equipment and ways it can be managed are also discussed. Some of the issues associated with severe slugging are large gas and liquid variations which lead to periods of no gas or liquid production following by large liquid production rates and excessively high gas velocities high average back pressure at wellhead and high physical loadings on equipment which may lead to fatigue damage.
AuthorsDate publishedI Das ; C Wordsworth ; G McNulty
1999
PublisherIMarE Conferences and Symposia
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Maintenance limits to marine diesel engines fuel injectors on board ships
AuthorsJ Listewnik ; T Graczyk ; T Jastrzebski et al.
PublisherComputational Mechanics Publications
AbstractThe attention of marine engineers is drawn to the complexity of fuel injectors production and their re-conditioning. Methods of fuel nozzle optimization and renewal are looked at. Wear and malfunctioning of fuel injectors are considered. Fuel valve maintenance and re-conditioning on board ships is discussed aiming to make the marine engineer on board aware of current constraints on fuel injectors maintenance.
AuthorsDate publishedJ Listewnik ; T Graczyk ; T Jastrzebski et al.
1997
PublisherComputational Mechanics Publications
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On the new NK rule requirements for the strength of propeller blades
AuthorsY Ino ; T Koshino
Date published1988
AbstractSome propeller blades of liners have been damaged due to fatigue which calls for revision to rule requirements by measuring propeller blade strength based on alternative stress instead of on the mean stress. In this paper a formula for blade stress calculation using simple parameters is derived from Schoenherr's thrust equation and examined by comparison with results of computer calculations using the lifting surface theory and measured stresses on actual ships' propellers.
AuthorsY Ino ; T Koshino
Date published1988
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Simple and Accurate Approach for the Prediction of Loads and Motions on Turret Moored FPSO Vessels
AuthorsI D Aryawan ; A Incecik ; E B Djatmiko
Date published1999
AbstractThis paper describes a new approach for the prediction of loads and motions on a turret moored Floating Production Storage and Offloading (FPSO) vessel. The method is semi-empirical which is based on the strip theory and hydrodynamic coefficients obtained from model test results. Furthermore the effect of mooring arrangements on loads and motions is included in a quasi-static manner and the non-linear restoring forces are calculated. The load and motion predictions can be carried out both in frequency- and time-domain.
AuthorsI D Aryawan ; A Incecik ; E B Djatmiko
Date published1999