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Formal Safety Assessment Study on the Effects of Introducing Helicopter Landing Area (HLA) on Cruise Ships
AuthorsG Guassardo ; G Demaria
Shelf Location233c
AbstractThis publication reviews the current rescue procedures by helicopters at sea, and looks at the availability of search and rescue helicopters, rescue of a person on a vessel, estimation of the expected number of persons rescued by helicopters following a casualty, risk considerations, and considerations on the impact on the design.
AuthorsPublisherG Guassardo ; G Demaria
IMO-Italy
Shelf LocationDate published233c
1998
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Biofilm Effects on Drag - Measurements on Ships
AuthorsG S Bohlander
PublisherIMarE Conferences and Symposia
AbstractThis paper describes the results of two full-scale power trials on a US Navy frigate to determine the effect of biofilms on ship power and fuel consumption. A significant change in power consumption ranging from 8-18% was measured by trials before and after underwater cleaning.
AuthorsDate publishedG S Bohlander
1991
PublisherIMarE Conferences and Symposia
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Nonlinear Wave Forces on a Marine Pipeline Buried in a Sand Seabed
AuthorsAyman M Mostafa ; Norimi Mizutani
Date published2002
AbstractPipelines are sometimes installed over or in the seabed away from the shoreline. They are used to transport fluids to or from offshore sites and from or to the shore or on a short cut across a bay. Whether the pipe runs over the seabed or is buried in it depends on various conditions including wave and current. In both cases pipes are influenced by wave and current forces but at variable degrees. Here the focus is on the non-linear wave forces acting on a submarine pipeline buried in a sand seabed of finite thickness. The problem is investigated both numerically and experimentally to confirm the validity of results. Analysis is further made for the effect of wave conditions on the wave forces acting on the pipeline. The experiments have been carried out in a 2D wave tank to measure the water surface levels in the pipe vicinity and the pore pressure around the pipe surface. The BEM-FEM model is modified to simulate the wave deformation and the porous flow around the pipeline. The wave forces on the pipe have been computed by integrating the pore pressure around the pipe surface. The results have been compared with the forces computed from pressure measurements in the experiment. Special attention has been given to the effect of wave conditions on the vertical uplift forces in comparison with the horizontal one.
AuthorsAyman M Mostafa ; Norimi Mizutani
Date published2002
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On estimation of ship rolling motion with flooded water on vehicle deck
AuthorsToshifumi Fujiwara ; Tomihiro Haraguchi
Date published2002
AbstractThe ro-ro passenger ship 'Estonia' sank in 1994 because she a large amount of water flooded her vehicle deck. To prevent further such disasters the safety of damaged ro-ro passenger ships has been discussed by IMO. The validity of a time domain simulation method is investigated for the rolling motion of a ro-ro passenger ship with a flooded vehicle deck expressed by a 2D lump mass concept. Model experiments using different amounts of water on deck were carried out to confirm the effectiveness of the method in regular beam waves. As a result the simulation method on rolling motion shows a reduced roll response caused by moving water on deck. Roll amplitudes obtained from the simulation are in good agreement with experimental ones. The present method could be used to assess the safety of ro-ro passenger ships with damaged holes and floodwater on deck.
AuthorsToshifumi Fujiwara ; Tomihiro Haraguchi
Date published2002
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The influence of environment on fatigue
AuthorsIMechE
PublisherIMechE
AbstractConf held in London 18 - 19 May 1977 Papers are Fundamental and practical aspects of crack growth under corrosion fatigue conditions Quantitative understanding of the effects of mechanical and environmental variables on corrosion fatigue crack behaviour Preliminary results of effect of environment on the low cycle fatigue behaviour of Type 316 stainless steel and 9% Cr ferritic steel The effect of environment and frequency on crack nucleation Stage 1 and II crack growth in two aluminium zinc magnesium alloys The influence of low oxygen and contaminated sodium environments on the fatigue behaviour of solution treated AISI 316 stainless steel Environmental effects on fatigue crack initiation and propagation in a cast steel Mechanisms affecting chemistry and material properties at crack tips in metals The effect of pressurized water reactor environment on fatigue crack propagation of pressure vessel steels A quantitative assessment of the superposition model of corrosion fatigue The effect of frequency and temperature on environmentally assisted fatigue crack growth below K1SCC in steels Cracking in 500 MW L P rotor shafts
AuthorsDate publishedIMechE
1977
PublisherIMechE
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Research on calculation method and simplified on-board measurement of NOx-emission from marine diesel engine
AuthorsYin Zibin ; Wu Guitao ; Dai Leyang
Date published2004
AbstractFor meeting the requirements and the characteristics of the on-board test of NOx-emission from marine diesel engines a new calculation method different from IMO's methods is put forward. An approximate calculation methods based on the new method and simplified measurement are also discussed. The calculation example and error analysis indicate the correctness of the new method and the feasibility of simplified on-board measurement of NOx-emission. The on-board test of NOx-emission becomes more practical and feasible by using handy gas analyzer.
AuthorsYin Zibin ; Wu Guitao ; Dai Leyang
Date published2004
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Report of the Advisory Group on Shipbuilding on the Upper Clyde
AuthorsDepartment of Trade and Industry
PublisherHMSO
AbstractReturn to an Address of the Honourable the House of Commons dated 29th July 1971 for 'Return of the Report of the Advisory Group on Shipbuilding on the Upper Clyde'
AuthorsDate publishedDepartment of Trade and Industry
1971
PublisherHMSO
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Study on localized corrosion on cargo oil tank bottom plate of oil tanker
AuthorsK Katoh ; S Imai ; D T Yasunaga et al.
Date published2003
Abstract'The study on cargo oil tank (COT) corrosion of oil tanker' has been carried out by 'The Shipbuilding Research Association of Japan Panel #242 (SR242) committee' for 3 years supported by the Nippon Foundation. The main objectives of this study were - (1) Making facts clear on VLCC localized corrosion on bottom plate scientifically (2) clarifying differences in localized corrosion behaviour between double hull (D/H) and single hull (S/H) and (3) reconfirmation that localized corrosion behaviour of mild steel (MS) and TMCP steel is the same. The wide range of studies by onboard inspections and laboratory tests on localized corrosion on bottom plate was carried out. In this study intensive field examinations are conducted for technical understanding of fact. 7 VLCCs including single hull and double hull have been examined. Key findings are looked at.
AuthorsK Katoh ; S Imai ; D T Yasunaga et al.
Date published2003
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Effect of seaward side wave screens on the dynamic pressures on a vertical wall
AuthorsBalaji Ramakrishnan ; Sundar Vallam
Date published2002
AbstractThe performance of two vertical wave screens formed by pipes on reducing the pressures due to waves on a vertical wall placed on its leeward side has been investigated through an experimental program. The variations in the reflection characteristics of the wall are also studied. Of the two screens the porosity of the seaward side screen was maintained constant while the porosity of the one in between this screen and the wall was varied. Thus four different screen porosity combinations in a random wave field were studied. The effects of the screen porosity on the reflection from the wall and the dynamic pressures on the vertical wall have been reported as a function of relative dissipating chamber width. The details of models instrumentation analysis of the data and the results are presented and discussed in this paper.
AuthorsBalaji Ramakrishnan ; Sundar Vallam
Date published2002
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Report on the investigation of the failure of a warp block on board the UK registered fishing vessel OCEAN STAR north of the Shetland Islands resulting in one fatality on 26 November 2001
AuthorsMarine Accident Investigation Branch
Shelf Location40d
AuthorsCatalogue numberMarine Accident Investigation Branch
UNK
Shelf Location40d
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CFD investigation of the effect of current turbulence on the hydrodynamic forces on a cylinder
AuthorsHyung Taek Ahn ; Yannis Kallinderis
Date published2005
AbstractThe inflow turbulence effect on the hydrodynamic forces exerted on a circular cylinder was investigated by using Reynolds-averaged Navier-Stokes simulations. The range of Reynolds numbers considered was from low sub-critical to supercritical. Time step and mesh resolution studies with various Reynolds numbers were performed for resolution of inflow turbulence. All cases of current profile turbulence were also compared to their corresponding uniform current cases in terms of the amplitudes and frequencies of the forces.
AuthorsHyung Taek Ahn ; Yannis Kallinderis
Date published2005
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Corrosion in Scotch marine boilers - II. Model boiler tests on the influence of the copper content of the steel on the corrosion of tubes in artifical sea water
AuthorsG Butler ; H C K Ison
Date published1957
AbstractModel Scotch marine boilers containing mild steel tubes of varying copper contents were operated on artifical seawater feedwaters differing in pH and oxygen content. The effects of steel and water composition on tube corrosion pitting and perforation are discussed.
AuthorsG Butler ; H C K Ison
Date published1957
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Experimental study on the influence of the crest width on the deformation of submerged breakwater
AuthorsSusumu Araki ; Toshihiro Miyazaki ; Ichiro Deguchi et al.
Date published2001
AbstractDesign method in case deformation is permitted has been investigated for rubble mound breakwaters recently. This paper describes the deformation of submerged breakwaters to investigate the process of the collapse and to establish the design procedure in case the deformation is permitted. Classification of deformation change in crest heights influence of core on deformation quantification of deformation and change in hydraulic performances are discussed based on the results of two-dimensional experiments. There was a large difference in the deformed crest heights among the submerged breakwaters with different crest widths.
AuthorsSusumu Araki ; Toshihiro Miyazaki ; Ichiro Deguchi et al.
Date published2001
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Initial Studies on the Design of a Clamp-On Ultrasonic Flowmeter for Wet Gas Pipelines
AuthorsD Vedapuri ; M Gopal
Date published2000
AbstractThis paper describes the design philosophy of a clamp-on ultrasonic flow meter for wet gas pipelines and discusses the challenges involved in the design. The project goal is to design a meter that will provide both the gas and the liquid flow rate. The liquid flow rate monitor can also be used with conventional gas metering systems to recalibrate meters.
AuthorsD Vedapuri ; M Gopal
Date published2000
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Regular waves acting on double-layer perforated caissons
AuthorsXuefeng Chen ; Yucheng Li ; Dapeng Sun
Date published2002
AbstractMost experimental analysis and theoretical studies on wave-acting structure interactions concentrate on single-layered perforated caissons with great success. However few studies focus on the double-layered perforated caisson. Here reflection coefficients and total horizontal forces of the double-layered perforated caissons under regular wave action are experimentally investigated. Empirical relationships between reflection coefficients and the ratio of total horizontal forces on the double-walled perforated caissons to those on solid vertical walls with various factors such as the overall relative chamber width the relative water depth and the porosity of the front perforated wall are given. These relationships may be used for engineering applications.
AuthorsXuefeng Chen ; Yucheng Li ; Dapeng Sun
Date published2002
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Reports on Researches carried out in the William Froude National Tank, between the years 1908-1921
AuthorsNational Physical Laboratory
Shelf Location235g
AbstractContents include: Report of the Experimental Tank Committee (1908), Report on the progress of the National Experimental Tank, The William Froude National Tank and its equipment. Also, the following articles: The effect of bilge keels on the rolling of lightships; Methodical experiments with mercantile ship forms; Effect of form and size on resistance of ships; Skin friction; Effect of longitudinal motion of a ship on its statical transverse stability; Speed, dimensions and form of cargo vessels; Model experiments on the effect of beam on resistance of mercantile ship forms; Model experiments in connection with submarine warfare. Includes numerous charts and diagrams.
AuthorsPublisherNational Physical Laboratory
London ; His Majesty's Stationery Office (HMSO)
Catalogue number623.8
Shelf LocationDate published235g
1924
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Analysis of nozzle orifice size effect on smoke in a diesel engine
AuthorsM Ishida ; D Sakaguchi ; H Ueki
Date published2000
AbstractThe effect of nozzle orifice size on smoke emission was examined in a turbo charged DI diesel engine. The nozzle orifice size was varied under various engine conditions. The rates of emissions were analysed. The results showed that the soot particle size was dependent on the orifice size and also on the spray penetration for the ignition delay period for the ignition delay period. The number of soot particles was shown to be dependent on the amount of fuel injected and on the excess air ration of the burned zone.
AuthorsM Ishida ; D Sakaguchi ; H Ueki
Date published2000
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Effect of truncated demand and capacity distributions on reliability of pipelines
AuthorsZiad Nakat ; Robert Bea
Date published2003
AbstractThis paper describes the effect of truncations on the reliability of pipelines. The effect of truncation by relief valves on the demand distribution is studied first. The effect of truncation by hydro-testing on the capacity distribution is studied second. Lastly the combined effect of truncation on demand and capacity is studied. A comparison and analysis of results is presented to assess the importance of truncated distributions of demand and capacity on the reliability of pipelines.
AuthorsZiad Nakat ; Robert Bea
Date published2003
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Effects of compression rate on unconfined compressive strength of cohesive soils - evaluation based on the effective stress
AuthorsM Shimizu
Date published1997
AbstractThe effects of the compression rate on the unconfined compressive strength are studied from the viewpoint that the strength needs to reflect the effective stresses of samples. Unconfined compression tests are performed on two remolded and consolidated clays of high and low plasticity index values with the measurement of pore water pressure via the pressure plate technique. A look is taken at the samples and method. Lastly the results are discussed.
AuthorsM Shimizu
Date published1997
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Effects of drained pre-loading on the performance of shallow foundations on over-consolidated clay
AuthorsB M Lehane ; C Gaudin
Date published2005
AbstractThis paper presents results from a programme of centrifuge experiments which examined the effects of drained pre-loading on the stiffness and load carrying capacity of shallow square footings founded on an over-consolidated clay. The increases in stiffness and bearing capacity induced by various levels of pre-loading are quantified and compared with standard design guidelines and previously published numerical predictions.
AuthorsB M Lehane ; C Gaudin
Date published2005