• Title/Summary/Keyword: Oil Tank Analysis

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Shielding effects and buckling of steel tanks in tandem arrays under wind pressures

  • Portela, Genock;Godoy, Luis A.
    • Wind and Structures
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    • v.8 no.5
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    • pp.325-342
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    • 2005
  • This paper deals with the buckling behavior of thin-walled aboveground tanks under wind load. In order to do that, the wind pressures are obtained by means of wind-tunnel experiments, while the structural non linear response is computed by means of a finite element discretization of the tank. Wind-tunnel models were constructed and tested to evaluate group effects in tandem configurations, i.e. one or two tanks shielding an instrumented tank. Pressures on the roof and on the cylindrical part were measured by pressure taps. The geometry of the target tank is similar in relative dimensions to typical tanks found in oil storage facilities, and several group configurations were tested with blocking tanks of different sizes and different separation between the target tank and those blocking it. The experimental results show changes in the pressure distributions around the circumference of the tank for half diameter spacing, with respect to an isolated tank with similar dimensions. Moreover, when the front tank of the tandem array has a height smaller than the target tank, increments in the windward pressures were measured. From the computational analysis, it seems that the additional stiffness provided by the roof prevents reductions in the buckling load for cases even when increments in pressures develop in the top region of the cylinder.

A Study on the Contingency Planning Methods under the Analysis of Oil Spill Potential -Application to the Port of Busan- (유류오염 포텐셜 해석을 통한 방제대책 수립방법에 관한 연구 -부산항을 중심으로-)

  • Jeon, Yong-Ho;Ryu, Cheong-Ro;Hwang, Chang-Su
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.10a
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    • pp.297-302
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    • 2003
  • This study was carried out to check the contingency planning methods under the analysis of oil spill potential and make a guide line to apply the results to the port of Busan. The expected spilled oil drift patterns are considered with the most probable scenarios under the base of the oil spill potential. The results obtained from this study are as follows: (1) Analysis method of oil spill potent was proposed and the applicability was proved by the application example to the port of Busan to make the contingency plan. (2) Responsible oil spill contingency planning methods / flow are suggested considered environmental factors and the oil spill potential. (3) The coastal waters of Busan was consist of rocky flat, man-made solid shore and beach shore. Marine traffic have high density of oil tanker and cargo ship. Also, oil tanker ship are examined in the small ships to be less than 3000t to supply oil to the ship moored / anchored as well as the large amount of oil tank / basin are located along the coast of Busan port. These systems are introduced to make in put data to the analysis of oil spill potential. (4) According to the analysis of historical records of oil spill accident in Busan, the frequency of accidents by cargo ship rank highest and 45% of accidents is caused by carelessness. about 65% of total accidents shows a small spill accident of less than $10k{\ell}$.

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Synthesis and Characterization of Mono- and Diacylglycerol Enriched Functional Oil by Enzymatic Glycerolysis of Corn Oil (옥수수유로부터의 효소적 glycerolysis에 의한 monoacylglycerol과 diacylglycerol 함유 기능성 유지 합성 및 특성연구)

  • Park, Rae-Kyun;Lee, Ki-Teak
    • Korean Journal of Food Science and Technology
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    • v.36 no.2
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    • pp.211-216
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    • 2004
  • Mono-and diacylglycerol-enriched oil was produced from corn oil through enzymatic glycerolysis using 1,3-specific immobilized lipase in solvent-free system and stirred-tank batch reactor. HPLC analysis revealed enriched oil was respectively composed of: 45.05, 16.27, 23.05, and 14.98% triacylglycerol, 1,3-diacylglycerol, 1,2-diacylglycerol, and monoacylglycerol; 13.21, 0.15, 2.02, 34.36, 49.12, and 1.14 mol% palmitic, palmitoleic, stearic, oleic, linoleic, and linolenic acids; and 0.014, 0.029, 0.010 and 0.053% ${\alpha},\;{\gamma},\;{\delta}-$, and total tocopherols. Physiochemical and melting properties of enriched oil were evaluated. Oxidative stability study revealed enriched oil showed higher peroxide and p-anisidine values than corn oil. Rosemary extracts (100 to 300 ppm) reduce oxidation.

Greenhouse Gas Emission Analysis by LNG Fuel Tank Size through Life Cycle

  • Park, Eunyoung;Choi, Jungho
    • Journal of Ocean Engineering and Technology
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    • v.35 no.6
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    • pp.393-402
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    • 2021
  • As greenhouse gas emissions from maritime transport are increasing, the International Maritime Organization is continuously working to strengthen emission regulations. Liquefied natural gas (LNG) fuel is less advantageous as a point of CO2 reduction due to the methane leakage that occurs during the bunkering and operation of marine engines. In this study, greenhouse gas emissions from an LNG-fueled ship were analyzed from the perspective of the life cycle. The amount ofmethane emission during the bunkering and operation procedures with various boil-off gas (BOG) treatment methods and gas engine specifications was analyzed by dynamic simulation. The results were also compared with those of other liquid fuel engines. As a result, small LNG-fueled ships without a BOG treatment facility emitted 32% more greenhouse gas than ships utilizing marine gas oil or heavy fuel oil. To achieve a greenhouse gas reduction via a BOG treatment method, a gas combustion unit or re-liquefaction system must be mounted, which results in a greenhouse gas reduction effect of about 25% and 30%. As a result of comparing the amount of greenhouse gas generated according to the BOG treatment method used with each tank size from the perspective of the operating cycle with the amounts from using existing marine fuels, the BOG treatment method showed superior effects of greenhouse gas reduction.

Analytical and Experimental Study on Vibration Characteristics for Rectangular Tank Structure Filled with Fluid (사각헝 탱크 구조의 접수 진동 특성에 관한 연구)

  • 최수현;김극수;손성완
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.3
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    • pp.195-203
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    • 2002
  • In the engine room and the aft part areas of the ship, there exist so many tank structures contacting with fresh water or sea water or oil. If these structures exhibit excessive vibrations during the sea trials, it takes a lot of cost, time and effort to improve vibration situation because the reinforcement work requires emptying the fluid out of the tanks, additional welding and special painting. It is therefore very important to predict a precise vibration characteristics of the tank structures at the design stage, however it is not easy to estimate vibration characteristics of the structures because of difficulties for accurate evaluation of the added (or virtual) mass effect due to the fluid inside the tank. In this paper, numerical and experimental approaches have been performed to present same fundamental data necessary for anti-vibration design of tank structures contacting with fluid, by investigating vibration behaviors of rectangular tank structure for various water depths.

Oil Absorption Effects of Organic Porous Materials (유기 다공성 소재의 흡유 효과)

  • Kang, Young-Goo;Han, Sang-Bum
    • Journal of the Korean Society of Safety
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    • v.21 no.1 s.73
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    • pp.86-91
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    • 2006
  • Oil spills caused by the accidents have been occurred from house and factory waste, grounded tanker, the rupture of storage tank and oil pipelines, the deterioration of various industrial facilities, etc. Many oil spills result in contamination of shorelines and workplace. Fire and explosion may happen from these spills. There are several technologies used for clean-up application, which include use of oil dispersing agents, absorbents, solidifiers, booms and skimmers by physical, chemical, and biological methods. Methods for oil spill clean-up operation are classified into the absorption type, gel type and self-swelling type. Porous materials with oil absorptive properties are classified into micropore, mesopore, and macropore depending on their pore sizes. Recently, new porous materials with smaller size have been developed, but the selective oil absorption in water-in-oil interface demonstrates the macro pore size. In this study oil absorption effects were evaluated using the organic porous materials with a complex function of gel type and swelling type. Samples were subjected to analysis by FT-IR spectroscopy and were characterized in terms of gel formation and morphologies. Oil sorption capacity, pressure retention force and gel strength were also measured. From these results, the physicochemical reactivity before and after gelation was verified and the industrial applications of clean-up operation were suggested.

Development of Microchip Removal Equipment Using Neodymium Permanent Magnets (네오디뮴 영구자석을 이용한 미세칩 제거장치의 개발)

  • Choi, Sung-Yun;Wang, Jun-hyeong;Wang, Duck Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.3
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    • pp.122-128
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    • 2021
  • Machining operations require removal of chips to keep the coolant clean and fresh throughout the operation time. In this study, microchip removal equipment was developed using AutoCAD and CATIA programs for 3D modeling and 2D draft. In addition, the flow analysis and electromagnetic field analysis of the equipment were performed using the COMSOL Multiphysics program. The flow design of the coolant oil tank was realized on the basis of fluid analysis results. Further, on the basis of magnetic density analysis, a conveyer was designed for effectively removing metal microchips in the tank by using arrays of neodymium permanent magnets.

The Effect of Added Mass of Water and Breath Mode in Fluid-Structure Coupled Vibration Analysis (부가질량 효과와 호흡모드를 고려한 구조-유체연성진동해석)

  • Bae, S.Y.
    • Journal of Power System Engineering
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    • v.9 no.4
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    • pp.71-76
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    • 2005
  • Marine structures are often in contact with inner or outer fluid as stern, ballast and oil tanks. The effect of interaction between fluid and structure has to be taken into consideration when we estimate the dynamic response of the structure appropriately. Fatigue damages can also be sometimes observed in these tanks which seem to be caused by resonance. Thin walled tank structures in ships which are in contact with water and located near engine or propeller where vibration characteristics are strongly affected by the added mass of containing water. Therefore it is essentially important to estimate the added mass effect to predict vibration characteristics of tank structures. But it is difficult to estimate exactly the magnitude of the added mass because this is a fluid-structure interaction problem and is affected by the free surface, vibration modes of structural panels and the depth of water. I have developed a numerical tool of vibration analysis of 3-dimensional tank structure using finite elements for plates and boundary elements for fluid region. In the present study, the effect of added mass of containing water, the effect of structural constraint between panels on the vibration characteristics are investigated numerically and discussed. Especially a natural frequencies by the fluid interaction between 2 panels and a breath mode of the water tank are focused on.

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Collision Analysis of Longitudinal Bulkhead of Container/RO-RO Ship with Trailer (컨테이너/로로 선 종격벽의 트레일러 충돌해석)

  • Kang, Myung-Hun;Song, In;Lee, Sang-Kyun;Kim, Sang-Kon;Cho, Sang-Rai
    • Special Issue of the Society of Naval Architects of Korea
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    • 2013.12a
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    • pp.13-20
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    • 2013
  • In this paper, a collision accident of a container/Ro-Ro ship was numerically analyzed. A container trailer collided with a longitudinal bulkhead of the ship in the accident, which constituted a longitudinal wall of a heavy fuel oil tank. Due to the accident, the bulkhead plate was ruptured and the heavy fuel oil spilled out of the tank. The detailed information regarding the collision velocity and the mass of the trailer was not provided. Therefore, several collision accident scenarios were constructed based upon the arrangement of the ramp way. Each collision accident scenario was analyzed to predict the extents of damage using a commercial numerical package, ABAQUS. Based on the analysis results it is proposed how to minimize the extents of damage. Through the investigations performed in this study it was found that the understandings of various damages due to collision accidents and the developments of structural design guidance against collision are necessary for the betterment of Container/RO-RO ships' performance.

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