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Comparison between pulsed MIG and short-circuit MAG on economical aspects for structural building
AuthorsA Scotti ; W A Pereira
PublisherThe American Society of Mechanical Engineers - ASME
AbstractA systematic approach base on the statistical principles of the Factorial Design technique was used to build up and compare operational envelopes (tolerance boxes) for the Pulsed current MIG and Short-circuit MAG welding of test plates by single passes on an automatic rig using the same range of parameters and the statistical principles of the Factorial Design technique. Process performance was assessed in terms of weld geometry deposition rate and deposition efficiency.
AuthorsDate publishedA Scotti ; W A Pereira
1996
PublisherThe American Society of Mechanical Engineers - ASME
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Comparison of loads predicted using Newwave and other wave models with measurements on the Tern structure
AuthorsJ B Rozario ; Tromans PS ; P H Taylor et al.
Date published1993
AbstractA conference paper from SUT's March 1993 conference which describes an analytical study in which wave loads measured on the Tern platform during a very severe storm are compared with predictions made by three different models of wave kinematics. Systems include the Newwave broadbanded probabilistic-based with second order connections a complex time-domain simulation based on random directional wave force theory and Stokes fifth order method.
AuthorsJ B Rozario ; Tromans PS ; P H Taylor et al.
Date published1993
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Concrete resistance in cavitation conditions on the spillway surface irregularities
AuthorsI S Novikova ; V M Semenkov ; V B Rodionov
Date published1995
AbstractThe possibility of the high-head structures operation is analysed for the conditions of the cavitation on the irregularities of the concrete surface. The effect of flow velocity cavitation degree air concentration and concrete compression strength on the length of both the cavitation incubation period and the post incubation period erosion intensity is discussed. Analysis is carried out of concrete cavitation resistance against the shape and size of aggregates and types of plasticizing compounds. Laboratory results are compared with data from prototype structures' operations.
AuthorsI S Novikova ; V M Semenkov ; V B Rodionov
Date published1995
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Crack identification on a cross-stiffened plate panel
AuthorsAgung Budipriyanto ; A S J Swamidas ; M R Haddara
Date published2004
AbstractThis paper discusses the use of a structure's vibration response in the early detection of cracks. Analytical and experimental studies of the effect of cracks on the vibration response of an 1/20 scale aluminum model of the stiffened side shell panel of a tanker were carried out. The model was carefully designed to obtain natural frequencies and mode shapes similar to those of the prototype structure. The results of the analytical study were used to determine the best locations to place the sensors on the experimental model. Results of the experimental and analytical studies are reported.
AuthorsAgung Budipriyanto ; A S J Swamidas ; M R Haddara
Date published2004
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Cracking the Code: The Relevance of the ISM Code and Its Impact on Shipping Practices
AuthorsPhilip Anderson
Shelf Location227b
AbstractThis book results from a major research project which aimed to establish how the ISM Code implementation was progressing and what issues might have come to light during the implementation phase. It includes chapters on the relevance of the ISM Code and its impact on shipping practices, background to the ISM Code, the philosophy of the ISM Code, evidence to demonstrate it is working, recent Court decisions, need for an international survey, survey participants and response, survey results, and conclusions.
AuthorsPublisherPhilip Anderson
The Nautical Institute
ISBN number1870077636
Shelf LocationDate published227b
2003
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Diesel engines in hazardous areas on offshore installations
AuthorsA Sokolov
Date published1989
AbstractConsideration is given to the possible risk associated with the use of a diesel engine in hazardous areas on offshore installations. It is impossible to achieve absolute protection. However reasonable or acceptable safety can be achieved. The paper considers possible hazardous situations by applying principles of combustion theory and gas dynamics and by an analysis of experimental data on gas combustion and finally identifies areas of risk and recommends methods of protection of diesel engines.
AuthorsA Sokolov
Date published1989
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Direct quantification of hydrocarbons in water based on infrared attenuated total reflection
AuthorsK O'Dwyer ; E O'Donoghue ; R Howley et al.
PublisherNational Engineering Laboratory
AbstractAn on-line measurement system based on infrared attenuated total reflection (ATR) for direct quantification of the total hydrocarbon index in water applying the C-H stretching vibration has been developed. The system uses evanescent wave absorption in a polymer coated sapphire rod as the detection principle. Using FTIR spectroscopy hydrophobic polymers were characterised. Polydimethylsiloxane (PDMS) was evaluated as a sensor. Modelling of hydrocarbon diffusion showed that the diffusion coefficient was independent of coating thickness.
AuthorsDate publishedK O'Dwyer ; E O'Donoghue ; R Howley et al.
2001
PublisherNational Engineering Laboratory
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Effect of Pile Head Condition on Lateral Behavior in Layered Sand
AuthorsS-W Lee ; Y-S Kim ; B-T Kim
Date published1999
AbstractThe purpose of the present paper is to estimate the effect of non-homogeneity constraint condition of pile head on the behavior of single pile. In this study to evaluate the effects of constraint condition of pile-head and layered sand (nonhomo-geneous) soil on the lateral pile behavior a series of model piles subjected to lateral load were performed in Nak-dong River sand. Results are compared with numerical predictions by the linear Winkler-spring method.
AuthorsS-W Lee ; Y-S Kim ; B-T Kim
Date published1999
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Effect of stress and temperature on mode fracture after reheat cracking
AuthorsV A Ferraresi ; R Trevisan
Date published1996
AbstractSamples of a commercially produced quenched and tempered high-strength low alloy (HSLA) steel were subjected to simulated post weld heat treatment for stress relief together with a Modified Implant Test: loading histories and thermal cycles were automatically recorded and fractography analysis carried out by Scanning Electron Microscopy. Two modes of fracture were observed LDIGF (Low Ductility Intergranular Fracture) and IGMVC (Intergranular Microvoid Coalescence). The effects of stress and temperature on fracture mode and on mode transition in stress-relief / reheat cracking are discussed and the use of MIT as a tool for assessing steel susceptibility to reheat cracking is evaluated.
AuthorsV A Ferraresi ; R Trevisan
Date published1996
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Effect of the yield to tensile ratio Y/T on structural reliability of linepipes
AuthorsHugo A Ernst ; Jose A Villasante ; Alfonso Izquierdo
Date published2003
AbstractThe effect of the Yield (Y) to Tensile (T) ratio Y/T on the structural reliability of linepipes with longitudinal defects was studied in this work. A model based on elastic-plastic fracture mechanics (EPFM) and plasticity theory was developed for that purpose. The analysis allows for load or deformation control situations. The results are shown in terms of curves of critical defect size versus the controlling variable i.e. load or deformation. For each one of the several materials studied different cases with different Y/T values were considered.
AuthorsHugo A Ernst ; Jose A Villasante ; Alfonso Izquierdo
Date published2003
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Effect of water inside a ship on its damage stability
AuthorsR Kambisseri ; T Hamano ; Y Ikeda
Date published1997
AbstractMotion studies of ship model with water inside compartments and with damaged compartments are presented. Model experiments with different amounts of water in its compartments and with a damage hole are conducted to find the influence of the water inside the ship and a damage hole on the motion and damping of ships. These experiments show that the flooded water's effect on the roll motion of ships is to lessen the amplitudes.
AuthorsR Kambisseri ; T Hamano ; Y Ikeda
Date published1997
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Effects of circular cutout on the plastic buckling of ring-stiffened cylindrical shell
AuthorsXU Bingham ; Zhengquan Wan
Shelf Location226a
AbstractCSSRC Report English Version 95003 A modified method of the conventional incremental theory of plasticity is developed based on the exact linearisation of the simplest flow theory for analysing the plastic buckling behaviour of elastic-plastic shell structure. The effects of circular cutout on the plastic buckling load of ring stiffened cylindrical shell subjected to external hydrostatic pressure are investigated by nonlinear finite element analysis.
AuthorsPublisherXU Bingham ; Zhengquan Wan
China Ship Scientific Research Center
Shelf LocationDate published226a
1995
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Effects of international shipping on European pollution levels
AuthorsJan E Jonson ; Leonor Tarrason ; Jerzy Bartnicki
Shelf Location226c
AbstractThe report presents an estimate of the effects of emissions from international shipping on depositions and photo-oxidant formation in Europe. The purpose of this report is to assess the effects of these emissions from international shipping on depositions and the air quality in Europe. Furthermore, these effects are quantified and compared to the effects of land based emissions.
AuthorsPublisherJan E Jonson ; Leonor Tarrason ; Jerzy Bartnicki
Norwegian Meteorological Institute
ISBN number3329879
Shelf LocationDate published226c
2000
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Effects of oil viscosity on DRA effectiveness and the components of pressure drop in inclined slug flow
AuthorsM Daas ; C Kang ; W P Jepson
Date published2001
AbstractThe effects of oil viscosity on each component of pressure drop in inclined slug flow and the effectiveness of DRA (drag reducing agents) is studied using a computational analysis and experimental work. Predicted values are shown to correspond well with experimental results. The experimental set up is described and results and discussion are presented. Finally conclusions are listed. Graphs appear on pages 474 to 476.
AuthorsM Daas ; C Kang ; W P Jepson
Date published2001
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Effects of sea water on the properties of submarine cables and wire sheathing compounds
AuthorsJ Unsworth ; Y Ho-Chu
PublisherIMarE Conferences and Symposia
AbstractThe effect of sea water and de-ionised water at 20 deg C 50 deg C and 70 deg C on some polymer compounds up to a period of 256 days immersion has been evaluated in order to determine which is the most suitable for submarine cables. The formulation of compounds based on any polymer can produce a wide variation in properties. However the study has value because `standard' recommended formulations are used.
AuthorsDate publishedJ Unsworth ; Y Ho-Chu
1987
PublisherIMarE Conferences and Symposia
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Experience and risk assessment of FPSOs in use on the Norwegian Continental Shelf: description of events
AuthorsRoger L Leonhardsen ; Gerhard Ersdal ; Arne Kvitrud
Date published2001
AbstractWith this paper summaries are given of the operational experience of FPSOs in Norwegian waters as seen from the regulatory point of view. Reported incidents challenges and lessons learnt in the years after the first production vessel came on stream are described and used in an assessment of risk. At the end of 2000 five production vessels are in operation on the Norwegian Continental Shelf. In addition there are three floating storage units. Totally these vessels represent more than nineteen years of offshore experience.
AuthorsRoger L Leonhardsen ; Gerhard Ersdal ; Arne Kvitrud
Date published2001
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Experience gained in the application of recent offshore legislation on the Brittania Project
AuthorsS O'Connor
PublisherIBC Technical Services Ltd Energy Division
AbstractThe Britannia Field is the largest undeveloped field on the UK Continental Shelf. Experiences gained in adopting the new legislation on the Britannia Project are recounted and the new legislation is listed. More significant pieces of legislation are explored in detail - the Safety Case Regulations (SCR) Prevention of Fire and Explosion and Emergency Response (PFEER) and the Design Construction Regulations (DCR). Recommendations for applying the new laws are given.
AuthorsDate publishedS O'Connor
1997
PublisherIBC Technical Services Ltd Energy Division
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Experimental measurements of ice loads and ice-induced moments on an Arctic structure
AuthorsK Kato ; H Kishimoto
PublisherAmerican Society of Mechanical Engineers - ASME
AbstractIn order to investigate ice-induced moments on a structure which cause instability a series of model experiments in an ice tank using an Arctic structure was performed. Two ice-induced moments - the overturning and twisting moments - were measured as well as the normal loads in three directions. The dependence of the ice moments on parameters such as ice thickness and ice flexural strength and the relationship to global ice loads were investigated.
AuthorsDate publishedK Kato ; H Kishimoto
1997
PublisherAmerican Society of Mechanical Engineers - ASME
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Experimental study on behavior of beam-column in welding steel frame
AuthorsS Wang ; H Y Lin ; B-M Wang et al.
Date published1995
AbstractExperimental study on the behavior of welding joint of steel frame with welding residual stress or with heating treatment subject to constant vertical load and alternating horizontal force is dealt with. Shear deformation behavior of the joint of beam-column and strain-stress in panel zone are obtained through experiments of four specimens made up of H shape beam-column. First the experiment and its result are looked at. After this theoretical analysis on panel zone is discussed.
AuthorsS Wang ; H Y Lin ; B-M Wang et al.
Date published1995
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First- and second-order wave forces on a large spar platform
AuthorsH Yoo ; D C Weggel ; E J Powers et al.
Date published1997
AbstractTwo different approaches are used to compute and compare the first- and second-order wave forces acting in the surge mode of a spar platform. The first approach uses second-order diffraction theory for directly computing wave forces on the spar. The second approach relies on the use of higher-order statistical signal processing to work out a second-order orthogonal Volterra-like model relating wave excitation and surge response. Results using experimental input are compared with results using numerically simulated input.
AuthorsH Yoo ; D C Weggel ; E J Powers et al.
Date published1997