The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Timerbaev Timu - One of the best experts on this subject based on the ideXlab platform.
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Subsea Pipeline Design Features on the Russian Shelf Conditions
University of Stavanger Norway, 2019Co-Authors: Timerbaev TimuAbstract:Master's thesis in Offshore technologyToday in Russia, more than 75% of the explored onshore oil and gas fields are involved in the development, and their reserves have been produced at least by half. New discovered deposits are less and less, and their resources are several times less than 20-30 years ago. Discovered, but not developed, offshore fields, by contrast, are classified as large or even giant [32]. Therefore, Russian oil and gas companies are facing the task of sharply intensifying their activities on the shelf in the near future. During the development of offshore fields, one of the main issues is the choice of transportation method of the extracted products. Today, hydrocarbons are transported either by tanker or by pipeline. For several reasons, preference is given to pipelines: the offshore pipeline, unlike a tanker, allows uninterrupted supply of hydrocarbons to the shore, regardless of weather conditions, and in addition, ship accidents are more dangerous than on pipelines. All Russian oil and gas shelves are located in freezing seas of Arctic. The region of the Arctic seas, is characterized by its harsh climatic and hydrometereological conditions, which require a special approach in the design of subsea pipelines. This thesis discusses the main features in the construction of underwater pipelines in the conditions of the Russian Arctic region. Also in Master thesis such stages of designing subsea pipelines as the choice of the Minimum Wall Thickness of the pipeline, the determination of the required Thickness of the weighting concrete coating are shown. In addition, the analysis of the stress-strain state of the pipeline during its installation is conducted. The calculations were carried out evidence from the trunk pipeline for the Shtokman gas condensate field (SCGF – Teriberka)
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Subsea Pipeline Design Features on the Russian Shelf Conditions
University of Stavanger Norway, 2019Co-Authors: Timerbaev TimuAbstract:Today in Russia, more than 75% of the explored onshore oil and gas fields are involved in the development, and their reserves have been produced at least by half. New discovered deposits are less and less, and their resources are several times less than 20-30 years ago. Discovered, but not developed, offshore fields, by contrast, are classified as large or even giant [32]. Therefore, Russian oil and gas companies are facing the task of sharply intensifying their activities on the shelf in the near future. During the development of offshore fields, one of the main issues is the choice of transportation method of the extracted products. Today, hydrocarbons are transported either by tanker or by pipeline. For several reasons, preference is given to pipelines: the offshore pipeline, unlike a tanker, allows uninterrupted supply of hydrocarbons to the shore, regardless of weather conditions, and in addition, ship accidents are more dangerous than on pipelines. All Russian oil and gas shelves are located in freezing seas of Arctic. The region of the Arctic seas, is characterized by its harsh climatic and hydrometereological conditions, which require a special approach in the design of subsea pipelines. This thesis discusses the main features in the construction of underwater pipelines in the conditions of the Russian Arctic region. Also in Master thesis such stages of designing subsea pipelines as the choice of the Minimum Wall Thickness of the pipeline, the determination of the required Thickness of the weighting concrete coating are shown. In addition, the analysis of the stress-strain state of the pipeline during its installation is conducted. The calculations were carried out evidence from the trunk pipeline for the Shtokman gas condensate field (SCGF – Teriberka)
Arumsari Nurvita - One of the best experts on this subject based on the ideXlab platform.
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Analisa Tegangan Redesain Underground Sectional Valve menjadi Aboveground Sectional Valve pada Gas Transmission Pipeline
Program Studi D4 Teknik Perpipaan - Politeknik Perkapalan Negeri Surabaya, 2019Co-Authors: Shofia Arif Vita, Endri Kusuma George, Arumsari NurvitaAbstract:Abstract - Pipeline along Fatmawati to Lebak Bulus with 8 inch diameter and 2.9 kilometer with fluids flow between gas stations. Along the pipeline, there is a sectional valve that’s very important to manage and control distributed fluids inside the pipeline. Pit limitations, humidity, and puddle water at rainy season may cause maintenance process and operation become less maximum. Thereby redesign are performed from underground sectional valve to aboveground sectional valve with transition pipe. This research start from calculating Minimum Wall Thickness, Minimum allowable span, and virtual anchor on pipe. Selection of design includes pipe bends, valve location, amount of supports, and pipe elevation. Selection valve redesign results will be analyzed by using manual calculations and software stress analysis. Redesign results of the sectional pipe determine the value of Minimum Wall Thickness of 0.0425inch. Pipe bends with 45 degree angle and 5D radius hot bend method. Pipe elevation is +750 mm from ground level with maximum distance of each support of 266.568 inch. Calculation result of stress analysis has fulfilled the allowable stress based on ASME B31.8. Thereby, it can be sure that the aboveground sectional valve design is safe and can become consideration on the next research.
Shofia Arif Vita - One of the best experts on this subject based on the ideXlab platform.
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Analisa Tegangan Redesain Underground Sectional Valve menjadi Aboveground Sectional Valve pada Gas Transmission Pipeline
Program Studi D4 Teknik Perpipaan - Politeknik Perkapalan Negeri Surabaya, 2019Co-Authors: Shofia Arif Vita, Endri Kusuma George, Arumsari NurvitaAbstract:Abstract - Pipeline along Fatmawati to Lebak Bulus with 8 inch diameter and 2.9 kilometer with fluids flow between gas stations. Along the pipeline, there is a sectional valve that’s very important to manage and control distributed fluids inside the pipeline. Pit limitations, humidity, and puddle water at rainy season may cause maintenance process and operation become less maximum. Thereby redesign are performed from underground sectional valve to aboveground sectional valve with transition pipe. This research start from calculating Minimum Wall Thickness, Minimum allowable span, and virtual anchor on pipe. Selection of design includes pipe bends, valve location, amount of supports, and pipe elevation. Selection valve redesign results will be analyzed by using manual calculations and software stress analysis. Redesign results of the sectional pipe determine the value of Minimum Wall Thickness of 0.0425inch. Pipe bends with 45 degree angle and 5D radius hot bend method. Pipe elevation is +750 mm from ground level with maximum distance of each support of 266.568 inch. Calculation result of stress analysis has fulfilled the allowable stress based on ASME B31.8. Thereby, it can be sure that the aboveground sectional valve design is safe and can become consideration on the next research.
Ga Weimi - One of the best experts on this subject based on the ideXlab platform.
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Crystallographic texture gradient along the Wall Thickness of an SF-copper tube
Science Direct, 2018Co-Authors: Al-hamdany Nowfal, Okmeie Heinz-günte, Salih Mohammed, Zhong Zhengye, Schwebke Ernd, Schell Norbe, Ga WeimiAbstract:Metallic tubes usually show heterogeneities along circumference and through Wall Thickness. Local textureanalysis by synchrotron diffraction and global texture analysis by neutron diffraction was used describing texturevariations related to the Wall Thickness. Test sample was an SF-Cu tube with outer diameter of 140mm and anaverage Wall Thickness of 10 mm. The texture is dominated by the cube component {001} 〈100〉. Other minorcomponents are rotated cube {013} 〈100〉, Goss {011} 〈100〉, Cu {112} 〈111〉, brass {110} 〈112〉, S {123}〈634〉. The texture gradient over the Wall Thickness shows a remarkable variation of the sharpness of the cubecomponent. Other components show only little variation. Comparing samples obtained at maximum WallThickness and at Minimum Wall Thickness one can see that the Wall Thickness has an influence on the globaltexture as well as texture gradient. Another interesting result is, that global textures measured directly byneutrons and averaged global textures, calculated from the set of local measurements by synchrotron diffraction,agree surprisingly well despite their different resolution
Shabtay Yoram - One of the best experts on this subject based on the ideXlab platform.
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Optimization of MicroGroove Copper Tube Coil Designs for Flammable Refrigerants
Purdue University, 2018Co-Authors: Cotto Nigel, Rhoads Adam, Ortoletto Anderso, Shabtay YoramAbstract:The ultralow Global Warming Potential (GWP) of propane (R290) and isobutane (R600a) refrigerants make them highly attractive for refrigerator and freezer applications, although their flammability necessitates strict use conditions with respect to refrigerant charge. Copper tubes with smaller diameters are widely used to reduce refrigerant charge. The process of downsizing copper-tube diameters involves detailed simulations and prototype construction as well as testing and validation. A proprietary heat exchanger design and simulation software tool (Jiang et al., 2006) was used to evaluate the performance of and optimize the design of domestic refrigerator condenser coils made with 5-mm outer-diameter copper tubes. Optimization was accomplished through the use of reduced order models, meta-models and a multi-objective genetic algorithm (MOGA). Reducing refrigerant charge was the primary objective. Secondary objectives included the reduction of the total footprint and the total tube-and-fin material mass. The baseline design used 6.35-mm O.D. copper tubes with a Minimum Wall Thickness of 0.41 mm, i.e., quarter-inch tubes with 0.016-inch Wall Thickness. The new designs use wavy-herringbone fins with reduced fin Thicknesses as compared to the baseline design. Other variables included the horizontal and vertical spacing of the tubes; number of tubes per bank; fin density; wavy fin pattern depth; tube length; and tube circuitry. For an R600a residential application, reduced internal volume was considered to be more important than the airside pressure drop. A Pareto chart is presented of optimized values from the design space. Compared to the baseline design, the best 5-mm design reduced the internal tube volume by 41 percent, along with a 57 percent reduction in coil footprint. Additionally, test data to validate the performance of prototype coils is presented with emphasis on the design, construction and manufacture of the heat exchanger coils
