A New Concept for CNG Carriers and Floating CNG/Oil Processing and Storage Offshore Platforms (original) (raw)
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Transactions of Nonferrous Metals Society of China, 2011
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2008
This paper relates to the development of a new concept of 220.000 m³ LNG designed by AKERYARDS France. This work is performed in the framework of FP6 IMPROVE project. The first phase of the activity related to the identification of stakeholder's requirements and the definition of key performance indicators. In parallel, several calculations have been performed to test the existing tools and to evaluate the potential gain at the concept design. These activities, associated with the definition of a 220000 m³ QuatarFlex prototype, including the aspects related to the naval architecture and general arrangement, have been regrouped in the so-called "first design loop". The second phase concerns the development of new modules to be integrated in the optimization tools in order to satisfy the requirements defined in the first phase. The final phase will be the application of the new (improved) optimization tools for the final LNG product. We highlight that the main target will be the multi-objective structural optimization of the prototype defined by "the first design loop". However, some feedback concerning the naval architecture point of view could be expected in this phase. The aim of the paper is to present the results of the first phase, as well as an overview of the analyses carried out during the "first design loop". Details about the different methodologies proposed for the second phase of the development are given.
LNG carrier- Structural design aspects
2009
The EU FP6-IMPROVE Project proposes to deliver an integrated decision support system for a methodological assessment of ship designs to provide a rational basis for making decisions pertaining to the design, production and operation of three new ship generations (LNG, RoPax, chemical tanker). These ship designs enhance the importance of early stage structural optimization and integrated design procedure, which contribute reducing the life-cycle costs and improving the performance of those ship generations. ABSTRACT: IMPROVE has aimed to use advanced synthesis and analysis techniques at the earliest stage of the design process, considering structure, production, operational performance, and safety criteria on a current basis. The nature of shipbuilding in Europe is to build small series of specialised ships. Thus, the IMPROVE project has addressed ships which, with their complex structures and design criteria, are at the top of the list for customisation. The specific objectives of the project have been to: develop improved generic ship designs based upon multiple criteria mathematical models improve and apply rational models for estimation of the design characteristics (capacity, production costs, maintenance costs, availability, safety, reliability and robustness of ship structure) in the early design phase use and reformulate basic models of multiple criteria ship design, and include them into an integrated decision support system for ship production and operation. The operators buying specialised ships generally plan to operate them for the majority of their lives. This means that the maintenance characteristics of the design are very important and for this reason, IMPROVE has focused on designing for a reduction in operation costs. Designing ship structures in such a way as to reduce the problems, for instance, of structural fatigue can help in this cause. Additionally, designing for minimal operational costs can help in increase the structural reliability and reduction of failures thus increasing safety. The targets have been to increase shipyard competitiveness by 10% to 20% and reduce manufacturing costs by 8%-15%, production lead-times by 10%-15%, and to find benefit of 5%-10% on maintenance costs related to structure (painting, corrosion, and plate replacement induced by fatigue). Front and centre of the IMPROVE project, however, has been the three specific ship types selected for the study. The first of these is a 220 000m 3 : capacity LNG Carrier with free ballast tanks, designed by STX-France S.A. The second ship type is a large Ro-Pax ship, with capacity for 3000 lane metres of freight and 300 cars, plus 1600 passengers, with design by Uljanik Shipyard (Croatia). The third ship is a 40,000dwt chemical tanker, designed by Szczecin Shipyard (SSN, Poland).
Curved and Layered Structures, 2023
Due to the escalating demand for liquefied natural gas (LNG) as a low-emission and environmentally friendly energy source, ISO tank containers have emerged as an innovative solution to facilitate efficient and costeffective mass transportation. The 40 ft ISO tank container, which encompasses a pressure vessel structure, is a versatile intermodal unit that seamlessly integrates into sea and land transportation networks. The main objective of this study is to present a comprehensive analysis for assessing the various frame design scenarios of the 40 ft ISO tank container for mini LNG carrier operation. The assessment is conducted under the provisions outlined in ASME Section VIII Division I code, which governs the design standards for boilers and pressure vessels. The finite-element analysis (FEA) scrutinizes three different structural design alternatives: frame thickness, the addition of support plates, and the addition of saddle supports, which are subjected to various loading conditions: stacking, lifting, and racking load tests. The analysis offers a comparative assessment of the safety level provided by the ASME design guidance in contrast to the FEA judgments based on ISO standards. It can be found that stacking and longitudinal load tests are more critical operational load scenarios. Increasing the frame thickness of the LNG ISO tank is more practical in increasing structural weight savings than adding more saddle supports and support plates.
Applied Sciences
Natural gas is becoming increasingly important to meet the growing demand for energy, guaranteeing a reduction in polluting emissions. Transportation in form of Compressed Natural Gas (CNG) could be an alternative to the traditional transportation by pipeline or, as liquefied gas, by ships, but the ratio between the mass of transported gas and the container weight is currently too low. One of the many projects focusing on the development of innovative lightweight pressure cylinders is GASVESSEL, which proposes composite cylinders with a diameter of more than 3 m: loaded on a ship, they could allow transporting quantities of CNG as big as 10,000 tons. The related loading and unloading processes affect both the overall time required for transport and the quantity of transported gas; therefore, they have an impact on the economic feasibility of the whole project. In this paper, a newly developed process simulation model is presented that allows assessing the duration of the loading and...
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Hydrocarbon is a major source of energy for sustainable development. Storage of hydrocarbon products, however, requires a significant amount of land space to land-scarce countries like Singapore. This paper presents an alternative way of storing hydrocarbon in Singapore coastal waters through the innovative design of a floating hydrocarbon storage facility. The design comprises free-floating and self-stabilizing tanks enclosed by barges that form a floating hydrocarbon storage facility. The tanks are made of prestressed concrete and they are designed to be self-stabilized when floating in the sea water. Owing to the lack of available design guidelines, design requirements on the stability and motion criteria for floating storage tanks are developed based on a review of existing codes of practice and design specifications for both onshore tanks and offshore vessels. A comprehensive study on the hydrostatic performance of various proposed floating tank design concepts with different storage capacities is carried out. This paper aims to give design recommendations on the tank's storage capacity and dimensional aspect ratios that fulfill the recommended stability requirements and motion criteria.
COMPUTER -AIDED DESIGN OF OIL AND GAS VESSEL TANK IN PROCESS INDUSTRY IN NIGERIA
Storage tanks are leak proof containers used to hold gases or liquids at pressures different from ambient pressure. Increase in demand for petroleum product worldwide has led to the production of very large quantities thus requiring more storage facilities. Inadequately designed storage tank could lead to failure and cause loss of lives. This study developed a computer software package for the design and cost evaluation of materials needed for a storage tank. Basic Engineering equations coupled with codes from American Petroleum Institute (API 650), American Society of Mechanical Engineering, American Society for Testing and Materials were used in the determination of the thickness, load on bottom plate, dish plate and cost of the storage tank. The research study show that in petrol storage tank for shell thickness, load on bottom plate, dish plate and its cost were 18.2 mm, 19,950 kg/m 3 , 9.55 mm, N4.45 million and 17.95 mm, 20,000 kg/m 3 ,10.02 mm, N4.52 million for developed software and manual calculations respectively.
Offshore Technology Conference, 2003
Governments and Operators are researching the potential for the development of floating liquefied natural gas (LNG) production facilities as a means to monetize gas reserves and to eliminate flaring of natural gas associated with oil extraction. Floating Production Storage and Offtake (FPSO) vessel hulls may be constructed in either steel or concrete. Concrete hull structures offer a number of advantages for the support of cryogenic facilities and the storage of produced liquids. Additionally, concrete substructures may be constructed in country using a significant proportion of locally procured materials and labor. A concrete FPSO solution has been developed to support a two LNG train facility. The concrete hull may be configured to be much larger than traditional steel FPSO alternatives and need not limit the liquid storage volume or deck area. The proposed solution has sufficient deck area to allow the topside facilities to be configured with some modularization and preassembly u...
Design & optimization of LNG-CNG cylinder for optimum weight
IJSRD, 2013
In current automobile sector, the weight of the vehicle is too important to increase the efficiency of the vehicle. There are too many component or subassemblies are in the automobile vehicle. In this paper the weight of the HYDROGEN fuel tank is optimized by applying the composite material concept with the existing material of the fuel tank. Initially the dimensional calculation for the existing pressure vessel and compare with the existing cylinder and then the FEA ( Finite Element Analysis) applied on the cylinder and material optimize up to the stress reaching equivalent to the stress of the existing cylinder. After that the dimension of the cylinder are finalize. The analysis yields a weight reduction of fuel tank.