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Estimating the impact of new generation antifoulings on ship performance: the presence of slime
AuthorsM Candries ; M Atlar ; C D Anderson
PublisherIMarEST
AbstractThis paper provides an overview of research at Newcastle University which compares the drag boundary layer and roughness characteristics of both tin-free SPC and foul-release coatings when newly applied. It was found that foul-release coatings offer less drag that the tin-free SPC. A literature review on the effect of slime films on ship resistance shows that slime films have a significant effect on drag but in turbulent flows the effect is likely to remain limited because of detachment processes.
AuthorsDate publishedM Candries ; M Atlar ; C D Anderson
2003
PublisherIMarEST
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Experimental study on directional wave and current on reef
AuthorsTetsuya Hiraishi
Date published2001
AbstractSome of the many isolated islands located in the northern Pacific are composed of small rigid rocks and atoll reefs. The water areas surrounded by such atoll reefs are suitable for the installation of a field research base for fishery environmental and natural resources. A model study is described to estimate the wave heights and periods in water areas surrounded by atoll reefs in an isolated island located in a deep sea. The offshore wave heights forecasting and experimental works to obtain the transformed wave parameters are discussed.
AuthorsTetsuya Hiraishi
Date published2001
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Exploring the effects of SCR on a two-stroke engine
AuthorsMER
Date published1994
AbstractResults from a joint research project by New Sulzer Diesel Mobil Oil and Lloyd's Register on applying Selective Catalytic Reduction (SCR) to low-speed two-stroke engines operating on heavy fuel oil. Tests were performed on a Sulzer RTA38 engine and show that NOx emissions can be reduced by as much as 90% using urea as the reducing agent. Problems with the system include sulphur-induced corrosion deposition of ammonium sulphate and anhydride and adsorption of SOx in the catalyst carrier. Further research using a metal catalyst substrate is planned. Some initial costings are given.
AuthorsMER
Date published1994
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Fleet and operation planning based on the ship design and logistic simulation
AuthorsHiroyuki Yamato ; Yasutomo Yamauchi ; Kenji Tanaka et al.
Date published2002
AbstractA methodology is presented for the design of a fleet and its operation on a route where other modes are competing with each other. The method brings together the logistic survey ship design and simulation on the computer. Ship design operational costs and freight route data and modal split by the sacrifice model are all taken into account. Simulation over time is used for the operational design and discount cash flow is used for evaluating the project. Finally a case study is presented on Tokyo-Hokkaido fast ferry service.
AuthorsHiroyuki Yamato ; Yasutomo Yamauchi ; Kenji Tanaka et al.
Date published2002
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Further Experiments on the Sealing Mechanism of a Synthetic Rubber Lip Type Seal Operating on a Rotating Shaft
AuthorsE T Jagger
Date published1973
AbstractThis paper shows that a seal of the type referred to operates under hydrodynamic lubrication conditions with a liquid film thickness of about 0.5æm. The paper concludes that the liquid film is prevented from leaking by the surface tension of the liquid itself.
AuthorsE T Jagger
Date published1973
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Great Britain Royal Commission on Environmental Pollution. Sixth Report. Nuclear Power and the environment
AuthorsB Flowers
Shelf Location226c
AbstractThis report aims to advise on matters, both national and international, concerning the pollution of the environment; on the adequacy of research in this field, and the future possibilities of danger to the environment. This study focus mainly on the nuclear power in the United Kingdom.
AuthorsPublisherB Flowers
HMSO
Shelf LocationDate published226c
1976
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Hydrodynamic forces on partly buried pipelines in waves/current
AuthorsS Cokgor ; I Avci
PublisherInternational Society of Offshore and Polar Engineers
AbstractThe forces on a cylinder laid on or partly buried in the sea bed were determined by measuring the pressure distribution on the cylinder surface in the case of steady current pure wave and combined wave and current. Force coefficients for in-line and lift forces were obtained.
AuthorsDate publishedS Cokgor ; I Avci
1998
PublisherInternational Society of Offshore and Polar Engineers
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ICSW guidelines on Seafarers' Welfare Convention No. 163 (1987) and Recommendation No. 173 (1987)
AuthorsInternational Committee on Seafarers' Welfare
Shelf Location226a
AbstractThis guide is intended to assist with the interpretation and implementation of the two principal instruments adopted by the International Labour Organisation covering seafarers’ welfare, the Convention on Seafarers’ Welfare No. 163 (1987) and Recommendation on Seafarers’ Welfare No. 173 (1987). The Guide is intended for the use of administrations, national or port welfare agencies, the voluntary welfare societies and others concerned with the provision of welfare services and facilities for seafarers.
AuthorsPublisherInternational Committee on Seafarers' Welfare
ICSW
ISBN number953925005
Shelf LocationDate published226a
1988
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Investigation on regional differences of recent bunker fuel oil quality and combustion troubles
AuthorsH Amatsu
Date published1992
AbstractDuring 1989 Mitsui OSK Ltd sampled and analysed all bunkers (marine diesel residual) taken on by their vessels and created a data base in which details on fuel and bunkering ports are stored alongside ship particulars and engine performance records. Results of studies on the data base include - world regional differences in fuel compositions; incidence of combustion problems with slow speed two stroke main engines and correlation with fuel type; association of high asphaltene fuels with combustion troubles.
AuthorsH Amatsu
Date published1992
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On the Effect of Some Uncertainties on the Structural Integrity Assessment of Corroding Pipelines
AuthorsJ Wolfram ; N Yahaya
Date published1999
AbstractThe most widely used method for the structural integrity assessment of corroded pipelines is the ASME B31G procedure that employs deterministic criteria. However there is usually considerable uncertainty concerning the shape and size of corrosion defects because of the limitations of the measurement techniques and therefore a statistical or probabilistic approach to structural integrity may be more appropriate. Effort has recently been put into developing such procedures and the research described in this paper has been directed towards that end.
AuthorsJ Wolfram ; N Yahaya
Date published1999
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Progress on guidance on fires and explosions
AuthorsSteve Walker ; Graham Morrison
Date published2003
AbstractThe progress in the development of new guidance in fire and explosion engineering worldwide is reviewed. The three main documents currently under development are discussed compared and contrasted. These three documents are: the three-phase project sponsored by UKOOA and the HSE to develop up-dated guidance for the treatment of fire and explosions; ISO development of a standard dealing with accidental actions as part of ISA CD-19901-3. API recommended practice for the design of offshore facilities against fire and blast loading.
AuthorsSteve Walker ; Graham Morrison
Date published2003
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Report on Tests Concerning Fires in Ships' Corridors
Shelf Location227b
PublisherDenmark, 1958
AbstractThe report describes and considers the fairly searching investigations caused to be undertaken by the Directorate of the Government Ships Inspection Service and the State Testing Laboratory – in particular by the Committee appointed by the Directorate – assisted by the Association of Shipyards, the Shipowners’ Association and the Fire Protection Committee for the purpose of examining the influence that exposed surfaces may have on the development of fire in ships. Contents include: Summary of development since 1952; Report on Full Scale Tests; Report on Laboratory Tests; Analysis of full scale test results; Analysis of Laboratory Tests Results and comparison with Full Scale test results; Final Remarks. Accompanying the Report there is another volume with the Appendices and a Summary of the Report.
Shelf LocationDate published227b
1958
PublisherDenmark, 1958
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Requirements made on general cargo and bulk freighters
AuthorsA Cumin
Date published1996
AbstractAn overview of the marine transport of dry and bulk cargoes by general cargo vessels bulkcarriers and specialist ships (containerships roro reefers) is presented with discussion of: categories and data on trade volumes (including major bulk minor bulk dry); forecast of newbuilding requirements; statistics on world dry cargo fleet and on ship losses; and critical discussion of the relatively high casualty rates causes of failure and safety initiatives.
AuthorsA Cumin
Date published1996
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Resonance phenomenon developed by breakwater or breakwater fixed on piles
AuthorsC Colmard ; M Belorgey ; P Roger
Date published1997
AbstractA lot of problems occur when the protected setting is in deep water. Many new systems were created like floating caissons immersed flags caissons fixed on piles ARION systems and AGRIPEL absorbers. An attempt is made to show that these breakwater types can present resonance phenomena developing when the protected setting is not completely absorbing. A simple calculation method of these phenomena is described and applied to the "Fixed water wall" phenomenon developed by caissons fixed on piles.
AuthorsC Colmard ; M Belorgey ; P Roger
Date published1997
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Simulation of sloshing loads on moving tanks
AuthorsMilovan Peric ; Tobias Zorn
Date published2005
AbstractThe aim of this presentation is to demonstrate the possibilities of predicting loads on partially submerged moving structures in particular on tanks in ships and on offshore platforms. After some introductory information the numerical method used to compute fluid flow and motion of floating bodies is briefly presented followed by the results of validation of sloshing simulations. Final sections present results of coupled simulations of flow around the vessel sloshing in tanks inside vessel and vessel motion due to flow-induced forces from all wetted surfaces.
AuthorsMilovan Peric ; Tobias Zorn
Date published2005
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The effects of swimbladder size condition and gonads on the acoustic target strength of mature capelin
AuthorsRoar Jorgensen
Date published2003
AbstractPre- and post-spawning capelin from the Barents Sea stock were observed in a net pen with a calibrated 38 kHz scientific split-beam echosounder. The transducer was positioned vertically or tilted. The acoustic target strength (TS) of capelin depended on swimbladder length. This paper reports recent ex situ TS experiments on Barents Sea capelin and evaluates the possible effects of swimbladder size and condition and of the gonads on the TS of pre- and post-spawning capelin. A look is taken at materials and methods followed by results and discussion.
AuthorsRoar Jorgensen
Date published2003
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The fire performance of cables on warships
AuthorsT R Manley ; D A Harrison
PublisherIMarE Conferences and Symposia
AbstractFollowing problems with the concept that halogens would act as fire retardants without hazard halogen free cables are now used in the construction of warships. Research on fire performance of cables relies heavily on small scale empirically based tests. These tests are not satisfactory for cable behaviour under service conditions. The paper asserts the need for more fundamental work on polymer decomposition in fires.
AuthorsDate publishedT R Manley ; D A Harrison
1987
PublisherIMarE Conferences and Symposia
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A computational investigation of the effect of geometric parameters on the discharge rate of a ship opening
AuthorsYasser Nabavi ; Sander M Calisal ; Ayhan Akinturk et al.
Date published2005
AbstractWater collection due to the interaction of a vessel's motion and ocean waves usually causes significant problems for ferries and fishing vessels. This research sought to find a relationship between the geometric characteristics of an opening on deck and the water discharge rate and aimed for the stability of open deck ferries and fishing vessels. The effective parameters on the discharge rate are the beam depth of the water collected on the deck and the discharge gap height. In this study CFD analyses for water discharge from a ship deck were carried out and the commercial code FLUENT was used to carry out the simulations. A 2D unsteady second-order solver in time and space was used for the simulation. The two-phase free-surface model was simulated by the VoF (volume of fluid) method. Using the water discharge the instantaneous depth Froude number was calculated as a part of the non-dimensional simulation. The effect of geometric parameters on the water discharge rate was investigated by keeping two parameters fixed while changing the third parameter. For each parameter three different values were evaluated and the comparisons of all 27 possible combinations of the effective parameters were presented. Results were compared with the experimental results obtained earlier at UBC.
AuthorsYasser Nabavi ; Sander M Calisal ; Ayhan Akinturk et al.
Date published2005
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Effects of varying number of ribbed walls on heat transfer and friction factors in a square channel
AuthorsS W Ahn ; H K Kang ; M H Kim
Date published2003
AbstractIt is well known that the ribs can break up the viscous sub-layer of the flow and promote local wall turbulence which in turn enhances the heat transfer from the rib- roughened heated wall. In addition the rib-roughened wall provides a greater surface area for heat transfer than that of the plain wall. In the case of cooling of gas turbine airfoils rib turbulators are cast mostly on two opposite sides of the cooling channel since the heat transfer takes place from both the inner walls of the pressure side and the suction side of the blade. However in some cases like electronic equipment heat exchangers and nuclear reactors rib turbulators are mounted on one side two sides three sides or all four sides of the cooling channel. Several publications have addressed the state-of-the art review of turbine blade cooling and the analysis of heat transfer and friction characteristics in the channel with two opposite ribbed walls. Further study of the combined effects of rib geometry and channel aspect ratio on the local values of heat transfer and pressure drop has also been reported. An objective of this research is to investigate the effects of the number of ribbed walls on wall friction and heat transfer coefficient in the square channel. In the past the majority of investigations have been related to turbine blade cooling in the channels with two opposite ribbed walls. However
AuthorsS W Ahn ; H K Kang ; M H Kim
Date published2003
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Flow-induced noise on underwater pressure-vector acoustic sensors
AuthorsGerald C Lauchle
Date published2002
AbstractFlow-induced self-noise on moored and drifting hydrophones arises when the sensors are subjected to oceanic currents such as those due to wave motion and changing tides. Flow-induced self-noise on underwater acoustic particle velocity (or acceleration) sensors and on intensity probes that measure particle velocity and pressure simultaneously is examined. The sensors considered are configured as neutrally buoyant spheres that encase an accelerometer or geophone. These velocity sensors are very sensitive to the turbulent fluctuations in the free stream or those which are generated by the flow over the sensor body itself. The flow-induced self-noise is thus determined by the level of unsteady force created by the turbulence and unsteady flow. Experiments are carried out by towing a spherical velocity sensor from 0.5 to 2.0 knots in a quiet basin of water that is 9 m long. A model is developed for the flow-induced unsteady drag and side force of the sphere. This is based on integrating the local wall pressure fluctuations over the surface of the sphere. Wind tunnel experiments are carried out to obtain the necessary statistics of these pressure fluctuations. The semi-empirical model is then validated using the towed sensor unsteady velocity spectra which are easily converted to unsteady drag or side force spectra by Newton's Second Law. Predictions of the flow noise response of neutrally buoyant spherical velocity sensors of various sizes are then carried out. It is concluded that at the same flow velocity a large inertial sensor is less responsive than a small one to the turbulent flow over its surface and in the near wake.
AuthorsGerald C Lauchle
Date published2002