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Seasonal variability of epibenthic communities in different areas of the southern North Sea
AuthorsHenning Reiss ; Ingrid Kroncke
Date published2004
AbstractIn this study the seasonal variability of epibenthic communities in the southern North Sea was investigated from November 2000 until May 2002 at three stations along a transect from the southern German Bight towards the northeastern part of the Dogger Bank. The transect reflects a gradient in temperature salinity food supply and fishing effort. Since so little is known about the ecology and biology of many epibenthic species in the North Sea this data provides valuable information on the seasonal patterns of several epibenthic species. The aim of this study is to describe the seasonal variability in species number abundance and biomass of the epibenthos at the three stations in the southern North sea. The study also aims to discuss environmental parameters which are in accordance with faunal patterns.
AuthorsHenning Reiss ; Ingrid Kroncke
Date published2004
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Seepage Slick Detection in the Brazilian Continental Margin Using Radarsat-1 Data
AuthorsF P de Miranda ; C M Bentz ; E C Pedroso et al.
Date published2001
AbstractNatural oil seeps indicate the presence of generative hydrocarbon source rocks without which there can be no accumulations. The high cost of offshore exploration has made the identification of seeps a well-accepted risk assessment methodology. This paper focuses on how seepage slick detection can be used to reduce oil exploration risk in offshore areas of the Brazilian continental margin (Foz do Amazonas and Santos basins). These offshore regions are often cloud-covered therefore spaceborne radars such as RADARSAT-1 are ideal for this application since they are only weakly affected by atmospheric conditions.
AuthorsF P de Miranda ; C M Bentz ; E C Pedroso et al.
Date published2001
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Seismo-acoustic propagation in an ice-covered arctic ocean environment
AuthorsS E Dosso
Date published2001
AbstractA controlled experiment carried out on the polar pack ice to investigate seismo-acoustic propagation in an Arctic ocean environment is presented. A hammer seismic survey is carried out to determine propagation speeds and attenuations of the principle seismic waves with results in good agreement with previously reported values. Comparison of seismograms recorded for a water-column source with the hammer seismograms shows that the dominant arrival appears to be the acoustic water wave that couples into ice seismic waves immediately below the geophone although significant SH waves and LP plate waves are noted. Rotational analysis in conjunction with seismic polarisation filtering provides good estimates of the bearings to the water-column acoustic sources.
AuthorsS E Dosso
Date published2001
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Selection and evaluation of advanced liquefied natural gas carriers - a case study middle East-Japan route
AuthorsJaswar Koto
Date published2008
AbstractA lot of new devices have been developed for LNG (Liquefied Natural Gas) carriers for example a pod propulsion system a high power water jet a marine gas turbine and so on and the applications of these devices have created many kinds of advanced LNG carriers. Ship owners should appropriately select new devices because the LNG carriers with new devices should offer not only enough profit to the owner but should also give enough satisfaction to the users and be accepted by societies from economical and environmental viewpoints. However the selection may be a very difficult task because there are many choices and the selection significantly affects total performance of LNG carriers. In the present paper
AuthorsJaswar Koto
Date published2008
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Self-propulsion model test of a wing-in-surface-effect-ship with Canard configuration Part 2
AuthorsHiromichi Akimoto ; Syozo Kubo ; Motoki Tanaka et al.
Date published2005
AbstractWing In Surface Effect Ship (WISES) is a high speed sea transport which uses the high efficiency of aerodynamic wing(s) in the proximity to the water surface. Most of WISES (or ekranoplan WIG ships) have large horizontal stabilizers on their tail for the stability in the surface effect. However the horizontal tail configuration shows some defect in takeoff. The authors are studying a canard type WISES for its potential in takeoff from rough seas. This paper presents a brief description of the canard WISES concept and its self-propulsion model test by 1.8m and 3.6m length models.
AuthorsHiromichi Akimoto ; Syozo Kubo ; Motoki Tanaka et al.
Date published2005
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Semi-hard and hard ballast tank coatings - the choice is challenging
AuthorsJ R Wolf ; C A Stucky
PublisherIMarE Conferences and Symposia
AbstractThree choices are available to the end user for protection of ballast tanks especially on bulkers and tankers - soft coatings semi-hard coatings and hard coatings. However IACS has ruled that salt water ballast tanks treated with soft coatings would no longer be considered as protected. Therefore a new type of coating known as semi-hard coatings have been developed with properties such as durability and surface hardness. Factors to consider when choosing a replacement coating include service life of the vessel feasibility to apply either type of coating time and cost. Using a single coat semi-hard product with St2 surface preparation the operator shipowner or manager can protect his ballast tank for as long as the replacement epoxies at half the cost.
AuthorsDate publishedJ R Wolf ; C A Stucky
1997
PublisherIMarE Conferences and Symposia
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Sensitivity of multiattribute design to economy environment - shortsea ro-ro vessels
AuthorsI Grubisic ; V Zanic ; G Trincas
PublisherUniversity of Newcastle
AbstractConcepts of sensitivity and robustness are inserted in a multicriterial design procedure to improve design quality. The new structure of the ro-ro design model and a new approach to the operating cycle definition are discussed. Realistic seakeeping estimation founded on extensive off-line study of generic ro-ro hull forms series was included in the model to define additional design attributes. The economy module was revised after analysis of new data from shipyards shipping companies and port authorities. Sensitivity of design decisions to future states of the operating environment and economy related parameters (opportunity interest rate borrowed-to-equity capital ratio years of loan repayment) has been established.
AuthorsDate publishedI Grubisic ; V Zanic ; G Trincas
1997
PublisherUniversity of Newcastle
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Sensitivity of the expected ships availability to different seakeeping criteria
AuthorsNuno Fonseca ; Carlos Guedes Soares
Date published2002
AbstractThe paper presents a methodology to calculate the seakeeping performance of ships which is given as an operability index and discusses the sensitivity of the results to the use of different seakeeping criteria. The calculation of the operability index which represents the percentage of time during which the ship is operational depends on the wave climate of the ocean area where the ship operates the dynamic response of the ship to the waves and the ship mission. The relation between the ship operability and the mission characteristics is established through the seakeeping criteria. The calculation of operability indexes and the sensitivity analysis are carried out for a containership operating in the North Atlantic and a fishing vessel operating near the Portuguese west coast
AuthorsNuno Fonseca ; Carlos Guedes Soares
Date published2002
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Sensor-assisted video mapping of the seafloor
AuthorsY Rzhanov ; L Huff ; G R Cutter et al.
Date published2002
AbstractVideo surveys have become an increasingly important ground-truthing component of acoustic seafloor characterisation and benthic habitat mapping studies. However this is still done by using sparse sample imagery supplemented by physical samples. By combining single video frames in a seamless mosaic a tool can be provided by which imagery has significant areal coverage while at the same time showing small fauna and biological features at mm resolution. Generating such a mosaic is a challenging task due to height variations of the imaged terrain and decimeter scale knowledge of camera position. An inexpensive technique is outlined for video mapping of the seafloor which uses minimal hardware and lightweight deployment platform. A case study is presented with the results from benthic habitat mapping and the ground-truthing of seafloor acoustic data using both real underwater imagery and simulations. A computer modelling of the process of video data acquisition (in particular on a non-flat terrain) allows for a better understanding of the main sources of error in mosaic generation and for the choice of near-optimal processing strategies. Various spatial patterns of video survey coverage are compared and it is shown that some patterns have certain advantages in the sense of accumulated error and overall mosaic accuracy.
AuthorsY Rzhanov ; L Huff ; G R Cutter et al.
Date published2002
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Setting and achieving technical limit goals in well construction by enabling the talents energies and attributes of people
AuthorsP W Scott ; D F Bond
Date published1998
AbstractTechnical Limit is an approach to well construction management which has led to a halving of the average historical drilling time and the execution of subsea completions in less than half benchmarked times for Woodside Offshore Petroleum Pty Ltd. A look is taken at the management of "soft" issues that complemented the approach and provided for achievement of outstanding performance. Breakthrough performance based on Technical Limit required a special environment in which all could perform. Attributes of this environment and the difficulties and emotions experienced by the team members are described.
AuthorsP W Scott ; D F Bond
Date published1998
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Shaft friction of piles driven in siliceous calcareous and micaceous sands
AuthorsJ A Schneider ; D J White ; B M Lehane
Date published2007
AbstractThe design of axially loaded driven piles in sand is considered here. The underlying behaviour governing the installation and subsequent axial capacity of piles driven in sand is poorly understood. This uncertainty is compounded by a lack of relevant data to support design formulations. Virtually no measurements exist of the axial capacity of a driven pile with the dimensions relevant to new offshore developments. The databases used to calibrate current design methods predominantly comprise short small diameter piles. Every design of a full-scale offshore pile is therefore reliant on the design method providing a correct extrapolation from the database pole geometry to the field conditions. It is therefore essential that the design method formulation captures the underlying mechanisms as closely as possible. The general applicability of one such method to siliceous calcareous and micaceous sands is examined.
AuthorsJ A Schneider ; D J White ; B M Lehane
Date published2007
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Shallow water and severe weather - a challenging combination
AuthorsR M Isherwood
Date published1996
AbstractThe experience of Orcina Ltd on the Fife Teal/Guillemot and Captain riser projects are highlighted. All three have shallow water depths but severe weather (design waves of 24m in height). Steep wave and lazy S riser configurations are considered. With steep wave configurations lightweight lines such as electrical cables or umbilicals tend to clash with other risers or moorings. Experience has shown that static analysis alone often misses the problem and that dynamic analysis is required even for preliminary design work. Clashing with the moorings can be reduced by coupling all the risers together with a mid-water buoy in a lazy S configuration. This configuration has its own problems and these are discussed together with possible solutions. It is concluded that early consideration of potential riser problems can help to reduce delay and rework at a later stage of a project.
AuthorsR M Isherwood
Date published1996
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Ship quality information systems
AuthorsR G Bea ; M Dry ; R Schulte-Strathaus
PublisherIMarE Conferences and Symposia
AbstractA Ship Quality Information System (SQIS) addresses the life cycle aspects of a ship including design construction maintenance and operations. Re-engineering existing ship processes is an essential part of a SQIS as it obtains maximum advantage from the introduction of an advanced Marine Structural Integrity Program (MSIP). A SQIS takes full advantage of modern computer communications and information technologies. The primary objective of a SQIS in substantial improvement in ship design construction maintenance and operational efficiencies. One component of a SQIS is a Ship Structural Integrity Information System (SSIIS). The core of the system is the vessel database which contains eight different information modules - design construction modifications inspection maintenance repair operations and monitoring. A SSIS prototype based on a Microsoft Access database is presented.
AuthorsDate publishedR G Bea ; M Dry ; R Schulte-Strathaus
1996
PublisherIMarE Conferences and Symposia
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Ship stabilizers; design and operation in correcting the rolling of ships. A handbook for merchant navy officers
AuthorsW Burger ; A G Corbet
Shelf Location235e
AbstractThe book's introduction provides a short historical review of various ship stabilisation systems. It then goes on to look at the rolling of ships and various types of gyroscopes which are important for use as sensory devices with tilting fin stabilisers. Types of anti-rolling devices are outlined and also anti-rolling tanks. Following chapters are concerned with various tilting fin systems and types used in both small and large vessels are described. Several fold-out plans of system arrangements and sections at back of book.
AuthorsPublisherW Burger ; A G Corbet
Pergamon Press Ltd
Shelf LocationDate published235e
1966
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Ship vetting for the BP Group - our policy and practices
AuthorsR W Fleming
PublisherThe Institute of Petroleum
AbstractTwo public statements made by BP in 1996 are given - "Our goals are simply stated - no accidents no harm to people and no damage to the environment" and "We aim to carry as much of our oil as possible in our own ships". BP's experiences in the past are instrumental in formulating its policies and actions in the future with decisions based on the evidence presented to the company. Ship inspection findings are looked at. Practices and the ship vetting decision are reviewed. The safe operation of tankers in coastal waters and approaching terminals is discussed with several cases briefly presented and the ISM code touched upon.
AuthorsDate publishedR W Fleming
1997
PublisherThe Institute of Petroleum
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Shipbuilding facility planning and design: a product-centric approach
AuthorsMark T Traband ; Daniel A Finke ; Joe Hadfield et al.
Date published2003
AbstractIn planning for the new shipbuilding facility for structural fabrication Electric Boat Corporation uses a product centric approach. The goal is to define manageable families of products and design a facility to ensure that all of the resources required by these products are readily available during their fabrication. In this paper the authors first present the methodology used to develop process models for the product families at Electric Boat. These process models provide critical input to the design team determining space equipment and manpower requirements for the new facility. Then the design process for a new facility is discussed a new facility focused on the production of structural product families for submarines.
AuthorsMark T Traband ; Daniel A Finke ; Joe Hadfield et al.
Date published2003
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Shipping air pollution and bunker fuels
AuthorsA Swinden
Date published1995
AbstractAny legislation controlling the emission of sulphur oxides from ships will have an effect on the quality price and availability of marine bunker fuels. It has been shown that the contribution from shipping to the total sulphur burden is minimal comprising less that 2% of the total. It is suggested that controlling SOx pollution from ships is third in priority after emissions from land based sources and from vessels in port. The three basic methods for controlling and reducing SOx from ships are: reduce the amount of fuel consumed remove SOx from the ship's exhaust gases and restrict the sulphur content of bunker fuels. Fuel consumption can be reduced by modifying engine design and exhaust gas treated by sea water scrubbing but this tends to reroute sulphur discharge from the funnel to the sea and the system is not easy to retrofit to existing vessels. Fuels meeting maximum sulphur contents can be produced from residues obtained from selected low sulphur (sweet) crude oils or by desulphurisation of high sulphur residues. The first option is the best and is the one used at present.
AuthorsA Swinden
Date published1995
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Ships and Marine Engines Volume III B : Part 2 : Practical shipbuilding : rigging equipment and outfit of seagoing ships
AuthorsIng J P De Haan
Shelf Location230a
AbstractThis is a manual for the construction of seagoing merchant ships and war-ships. Chapters cover Joiner's work, plate work and accommodations (including ceiling and cargo battens, wood and steel hatch covers, grain bulkheads, materials for joiner work, locks, hinges and fittings, partitions, sheatings and ceilings, furniture, upholstery, wooden and steel interior staircases and elevators); Wood decks and deck coverings; Insulation and refrigerating machinery (including comparison of insulations, fixing of insulating materials, arrangement of refrigerated holds, fire-proof bulkheads, refrigerating machinery); Pipe work, fire extinguishing, ventilation and heating; (including various piping materials, valve types and fittings, sanitary equipment, pipe lines, pipe lines on tankers, fire extinguishing installations, ventilation, air conditioning, heating of accommodations) and Preservation, paint work and tank testing.
AuthorsPublisherIng J P De Haan
De Technische Uitgeverij H Stam NV
Shelf LocationDate published230a
1961
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Ships' Boats
AuthorsE. W. Blocksidge
Shelf Location235c
Abstract'Their qualities, construction, equipment and launching appliances' Contents are arranged within ten parts to the book. Part 1 is an introduction to the subject. Part 2 looks at classification of boats and their form, stability, strength and capacity. Part 3 considers the types of timbers used and boat-yard equipment. Part 4 examines the construction of different classes of lifeboats. Part 5 looks at motor boats, nested boats, surf boats and steel boats. Part 6 gives details of lifting hooks, keel plates, engaging and disengaging gear and buoyancy air-case construction on boats. Part 7 examines equipment, sails, galvanising and painting and repairs of boats. Part 8 concerns fire and boat drills. Part 9 deals with weights of lifeboats, equipment and materials. The final part concerns boat stowage and launching appliances.
AuthorsPublisherE. W. Blocksidge
Longman's, Green & Co.
Shelf LocationDate published235c
1920
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Shuttle tankers
AuthorsMER
Date published1998
AbstractA series of articles on shuttle tankers includes a discussion of the steady expansion of the shuttle tanker fleet since 1977. A new generation of multipurpose shuttle tanker (MST) with diverse offshore capabilities for service in deeper waters was headed by Berge Hugin commissioned from Samsung of South Korea by Statoil and Bergesen. A high degree of manoeuvrability is dictated by the operating profile of a shuttle tanker. MAN B&W cite a number of machinery configurations to satisfy the propulsion and auxiliary power requirements. The principle of VOC (volatile organic compounds) fuel burning are described. A system that can condense and collect the VOC in special tanks and use it at high pressure as fuel for the main engine of a shuttle tanker instead of heavy fuel has been developed by Statoil and MAN B&W.
AuthorsMER
Date published1998