To see the other types of publications on this topic, follow the link: Oil leakage.
Dissertations / Theses on the topic 'Oil leakage'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 18 dissertations / theses for your research on the topic 'Oil leakage.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Yildiz, Meltem. "Modeling And Simulation Of Oil Leakage In Radial Lip Seals." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611842/index.pdf.
Full textAbstract:
Radial lip seals are used to prevent leakage between machine elements in many
industrial applications. During operation, fluid film between seal lip and shaft surface
generates a pressure distribution on the lip which is elastically deformed due to
hydrodynamic pressure. Surface roughness parameters in terms of moments of height
profile distribution (rms roughness, skewness and kurtosis) affect the rate of oil leakage.
A computer program is developed for elastohydrodynamic analysis of radial lip seals.
Both the fluid mechanics of the lubricating film and the elastic deformation of the lip are
taken into consideration to determine the hydrodynamic pressure distribution and the oil
flow through the seal lip. The effect of shaft surface roughness on hydrodynamic
analysis is taken into account by using average Reynolds equation with flow factors. For
non-Gaussian surfaces, the modified flow factors are used to investigate the effects of
skewness and kurtosis on the oil leakage. Numerical tests are performed for different
skewness, kurtosis and initial seal tightness values. Results show that when a seal is
mounted with a high initial tightness, the hydrodynamic pressure developed is not
enough to deform the lip to form a fluid film between the shaft and the seal lip. It is
observed that for the same rms roughness and skewness, the side flow rate increases as
the kurtosis value increases. However, for the same rms roughness and kurtosis values,
the side flow rate decreases for all skewness values.
2
Lundberg, Johan. "Undocumented oil leakages : A study about stern tube seals and leakages." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-103570.
Full textAbstract:
The majority of the vessels in the commercial fleet utilize oil lubricated stern tubes. Unfortunately, this brings about a risk of oil leaking from the stern tube into the marine environment if the stern tube seal would become worn or damaged by foreign materials. Previous studies concluded that, on average, 2.6 litres of oil per day leak out from the stern tube of ships. This essay has investigated the causes that could increase the leakage rate from the stern tube by reviewing literature, interviewing experts, and sending out surveys with questions regarding the subject. The answers that were received painted a clear picture that it is impossible to get a perfect seal on a stern tube. The causes that could influence the leakage rate were design related, such as vibrations, the rotational speed of the propeller shaft, radial and axial movements of the propeller shaft, as well as external causes such as the quality of water and foreign materials, for example, fishing lines and nets. The question whether water lubricated stern tubes were a viable alternative compared to oil lubricated stern tubes was also investigated. The result was that the bearing on a water lubricated stern tube did not have as long lifespan as an oil lubricated bearing.<br>Majoriteten av fartygen i handelsflottan använder oljesmorda propellerhylsor för att smörja propelleraxeln. Tyvärr medför det en risk att olja kan läcka ut från hylsan om tätningarna skulle bli utslitna eller skadas av främmande föremål. Tidigare forskning har visat att cirka 2,6 liter olja per dag läcker ut genomsnittligen från fartyg i handelsflottan. Denna uppsats har utrett vad som kan påverka läckagemängden från en propellerhylsa genom att utnyttja intervjuer och enkätsvar. Svaren som framkom var att det är mer eller mindre omöjligt att få en perfekt tätning på en propellerhylsa. Saker som kan påverka läckagemängden var designfenomen som vibrationer, axiella- och radiella rörelser och varvtal på propelleraxeln, samt yttre påverkan som vattenkvalité och främmande föremål som fiskelinor och nät. I uppsatsen jämförs även vattensmorda propellerhylsor med fokus på livstid, kostnad och underhåll, med en oljesmord propellerhylsa. En slutsats är att det vattensmorda lagret inte har samma livstid som det oljesmorda.
3
Culotta, Vittorio G. "Theory versus experiment of the rotordynamic and leakage characteristics of smooth annular bushing oil seals." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1512.
Full textAbstract:
This thesis provides a comparison of experimental rotordynamic coefficients for
laminar, smooth bushing oil seals to theoretical predictions from XLLubeGT and
XLAnSeal. The experimental results come from a new test rig developed at the
Turbomachinery Laboratory at Texas A&M University. The two software programs
were developed to predict the static and dynamic characteristics of seals. XLLubeGT is
a Reynolds equation based program while XLAnSeal is based on a bulk-flow Navier-
Stokes model that includes temporal and convective acceleration terms. XLAnSeal was
used to predict the added-mass terms of the seals since XLLubeGT assumes those terms
to be zero or negligible. The data used for input into the two seals code was the actual
measured conditions from the test rig. As part of the input parameters, inlet inertia
effects and thermal gradients along the seal were included. Both XLLubeGT and
XLAnSeal have the capability to analyze straight bore seals with different inlet and
outlet clearances essentially a tapered seal but seal expansion caused by the radial
differential pressure across the seal bushing was not included.
Theoretical and experimentally determined dynamic characteristics include
stiffness, damping, inertia terms and Whirl Frequency Ratio (WFR). Seal static
characteristics are also reported. They include: leakage, shaft center line loci and
Reynolds numbers. Test conditions include three shaft speeds: 4000, 7000 and 10,000
rpm, three test pressures: 21, 45 and 69 bar [300, 650, and 1000 psi] and multiple
eccentricities from 0.0 to 0.7. The results for the dynamic characteristics show good
correlation of the experimental data to the theoretical values up to an eccentricity of
about 0.5. At higher eccentricities, the theory generally under-predicts the dynamic
characteristics. Inertia terms are greatly under-predicted. The results for the static
characteristics also show good correlation to the experimental data, but they also have a
tendency to be under-predicted at higher eccentricities.
4
McCallum, Katie Arlene. "Probabilistic Analysis of Pipeline Reliability Using a Markov Process." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1334932206.
Full text
5
Lundby, Eleonor, and Marcus Viktorstam. "Leakage in an oil pump system – Analysis and suggested improvements : A case study at Husqvarna AB." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-40785.
Full textAbstract:
Unintended oil leakage is a problem that occurs in a wide range of products in the forest and gardening sector. Presented as a basis for this thesis is an oil pump system designed to provide lubrication for the chain on a pole saw. In this system, unintended leakage occurs and creates a problem. The purpose and aim of the thesis are to investigate and determine the cause of the leakage and suggest how the problem can be solved. Since the company which sells these pole saws profiles as environmentally conscious it is important to solve the issue. To fulfill the purpose and aim of the thesis, several tests are set up to investigate the cause of the leakage. When an understanding is reached, the set-based concurrent engineering method is used to generate solutions and increase knowledge of the problem. These concepts were tested, and the outcome and effectiveness documented. The results are presented and discussed from the process of the thesis. The primary cause of the leakage is credited to an over-pressure building within the oil tank, forcing the oil through the obstructions and out the outlet. Included in the results and discussions are suggested solutions to the problem. Two concepts are included as solutions, as well as suggestions for future work and research of the problem.
6
Chan, Gabriel Angelo Sherak. "Trade and the environment : the political economy of CO₂ emission leakage with analysis of the steel and oil sands industries." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/115466.
Full textAbstract:
Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2009.<br>Thesis: S.B., Massachusetts Institute of Technology, Department of Political Science, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 113-116).<br>Introduction: In 2007, scientists and governmental officials from around the world contributed to the United Nations-authorized Intergovernmental Panel on Climate Change's (IPCC) Fourth Assessment Report. Through peer-reviewed scientific research and governmental review, the IPCC came to the conclusion that "warming of the climate system is unequivocal," and that "most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations." The IPCC Fourth Assessment states that humans have "more likely than not" contributed to the phenomena of more frequent "warm spells/heat waves," larger "area[s] affected by droughts," more "intense tropical cyclones.. .and heavy precipitation events," and "extreme high sea level[s]." Citing "high agreement" and "much evidence," the IPCC states that "with current climate change mitigation policies and related sustainable development practices, global GHG [greenhouse gas] emissions will continue to grow over the next few decades." (Intergovernmental Panel on Climate Change, 2007)<br>by Gabriel A. Chan.<br>S.B.
7
Majdic, Franc. "Comparison of spool radial grooves influence between water and oil hydraulics." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199629.
Full textAbstract:
In this paper numerical flow calculations with respect to the annular gaps with added radial grooves normaly used on the spools of directional control valves were carried out. The impact of various annular gap geometries and radial grooves during variable pressure conditions, and while using different hydraulic fluids, on the flows through annular gaps were investigated for different flow regimes. Samples with different geometries and numbers of radial groves on the spool of the directional control valve were also made for the purpose of carrying out flow measurements. The two different hydraulic fluids that were used in the numerical simulations and for the flow measurements were a hydraulic mineral oil and tap water. The results of the numerical calculations for the different models of the radial grooves with axially symmetric geometries show their impact on the internal leakage with respect to three different regimes of flow. The results of the numerical calculations based on the use of a hydraulic oil show a trend that was established by the experimental investigation.
8
Folmerz, Mattias. "Oljeläckage torkparti PM12 : Utvärdering av oljeläckage i torkparti PM12." Thesis, Högskolan Dalarna, Maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:du-27364.
Full textAbstract:
Stora Enso Kvarnsveden är ett pappersbruk lokaliserat vid Dalälven i Kvarnsveden. Bruket har för tillfället två producerande maskiner och detta arbete behandlar en av dem, vilken är PM12. På PM12 har man problem med oljeläckage i maskinens torkparti. Läckagen uppstår genom de lagerhus som finns för att bära upp torkpartiets valsar. I detta arbete har man undersökt vad läckagen beror på med fokus på dess lagertätningar. Syftet och målet med detta arbete har varit att utreda varför läckagen uppstår samt att generera koncept för att minska eller helt eliminera läckagen. Arbetet har innefattat diverse mätningar och utredningar för att komma till rätta med problemet. En litteraturstudie har genomförts för att identifiera felorsaker samt lösningar. Koncept har genererats utifrån studien samt de mätningar som utförts. Man har inte under arbetets gång helt kommit fram till vad läckagen beror på men man har kommit en bra bit på vägen. Förslag till fortsatt arbete har getts där det rekommenderas mer specifikt vilka typer av mätningar som bör genomföras samt de koncept man som bör bygga vidare på.<br>Stora Enso Kvarnsveden is a paper mill located at Dalälven in Kvarnsveden. The utility currently has two producing machines, and this study deals with one of them, which is PM12. At PM12 there is a problem with oil leaks in the machine's drying section. Leakage occurs through the bearing houses who are there to support the dryer's rollers. In this study, it has been investigated what the leakage is due to focusing on its bearing seals. The purpose of this study has been to investigate why leakage occurs and to generate concepts to reduce or eliminate leaks. The study has included various measurements and investigations to address the problem. A literature study has been conducted to identify causes and solutions. Concepts have been generated from the literature study as well as the measurements that have been taken. After this study it´s not fully realized why the leakage occurs, but it had come a long bit on the way. Proposals for continued work have been given, where it is recommended more specifically what kind of measurements that should be done and the concepts that should be further developed.
9
Lima, Tarcisio Misael de. "Análise de metodologias para localização de defeitos em cabos isolados de alta tensão do tipo oil filled (OF)." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-10072014-170858/.
Full textAbstract:
Duas metodologias que podem ser utilizadas na localização de defeitos em cabos isolados de alta tensão do tipo Oil Filled (OF) foram analisadas. As metodologias descritas têm como princípio a localização de vazamentos de óleo, ou seja, todo defeito seguido de vazamento de óleo poderá ser localizado a partir das mesmas. A primeira metodologia é baseada no congelamento dos cabos OF, com a linha desenergizada, a fim de localizar vazamentos de óleo de cabos OF a partir de 300 litros por mês. A segunda metodologia é baseada na utilização de traços de gás perfluorcarbono Perfluorocarbon Tracer (PFT), através de um sistema montado com equipamentos que permitem realizar a localização de vazamentos de óleo de cabos OF a partir de 100 litros por mês, sem a necessidade de desligamento da linha subterrânea. Esta dissertação propõe algumas melhorias na metodologia do congelamento e apresenta as primeiras experiências de utilização do PFT no Brasil para localização de vazamentos de óleo.<br>Two methods that can be used to locate faults in Oil Filled (OF) cables were analyzed. The methods described have the principle of oil leak location. All defects followed by oil leakage can be located using the same. The first method is based in OF cables freezing, with the line outage, in order to locate oil leaks from 300 liters per month and above. The second method is based on the use of tracer gas - Perfluorocarbon Tracer (PFT) and devices that allow to perform the location of oil leaks from 100 liters per month, without the need of underground line outage. This paper proposes some improvements for the freezing method and presents the first experiments in Brazil using PFT to locate oil leakage.
10
Tian, Qing. "Some Features of Tip Gap Flow Fields of a Linear Compressor Cascade." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9673.
Full textAbstract:
This thesis presents some results from an experimental study of three-dimensional turbulent tip gap flows in the linear cascade wind tunnel, for two different tip gap clearances (t/c=1.65% and 3.3%). The experiments focus on near-wall flow field measurements for the stationary wall and moving wall, and static pressure measurement on the low end-wall for the stationary wall case. The representative flows were pressure driven, three-dimensional turbulent boundary layers in the linear cascade tunnel for the stationary wall case, and the combination of the pressure driven and shear driven flow for the moving wall case.
Several experimental techniques are used in the studies: a three-orthogonal-velocity-component fiber-optic laser Doppler anemometer (3D-LDA) system, surface oil flow visualization, and a scanivalve system for static pressure measurement through pressure ports on the end-wall. From the details of the oil flow visualization pattern on the end-wall, some features of the passage flow, cross flow, and the tip leakage vortex in this cascade flow were captured. Oil flow visualization on the blade surface reveals the reattachment of the tip leakage vortex on the blade surface. The static pressure results on the lower end-wall and mid-span of the blade show huge pressure drop on the lower end-wall from the pressure side to the suction side of the blade and from mid-span to the lower end wall. The end-wall skin friction velocity is calculated from near-wall LDA data and pressure gradient data using the near-wall momentum equation.
The statistics of Reynolds stresses and triple products in two-dimensional turbulent boundary layer and three-dimensional turbulent boundary layer was examined using a velocity fluctuation octant analysis in three different coordinates (the wall collateral coordinates, the mid tip gap coordinates, and the local mean flow angle coordinates). The velocity fluctuation octant analysis for the two-dimensional turbulent boundary layer reveals that ejections of the low speed streaks outward from the wall and the sweeps of high speed streaks inward toward the wall are the dominant coherent motions. The octant analysis for the three-dimensional turbulent boundary layer in the tip gap shows that the dominant octant events are partially different from those in the two-dimensional turbulent boundary layer, but ejection and sweep motions are still the dominant coherent motions. For the three-dimensional turbulent boundary layer in the moving wall flow, the near-wall shear flow reinforces the sweep motion to the moving wall and weakens the out-ward ejection motion in the shear flow dominant region. Between the passage flow and the shear flow, is the interaction region of the high speed streaks and the low speed streaks. This is the first time that the coherent structure of the three-dimensional turbulent boundary in the linear cascade tip gap has been studied.<br>Master of Science
11
Tian, Qing. "Near Wall Behavior of Vortical Flow around the Tip of an Axial Pump Rotor Blade." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/30062.
Full textAbstract:
This dissertation presents the results from an experimental study of three-dimensional turbulent tip gap flow in a linear cascade wind tunnel with 3.3% chord tip clearance with and without moving endwall simulation. Experimental measurements have been completed in Virginia Tech low speed linear cascade wind tunnel. A 24" access laser-Doppler velocimeter (LDV) system was developed to make simultaneous three-velocity-component measurements. The overall size of the probe is 24"à 37"à 24"and measurement spatial resolution is about 100 μm. With 24" optical access distance, the LDV probe allows measurements to be taken from the side of the linear cascade tunnel instead of through the bottom of the tunnel floor. The probe has been tested in a zero-pressure gradient two-dimensional turbulent boundary layer.
Experimental measurements (oil flow visualization, pressure measurement, and LDV measurement) for the stationary wall captured the major flow structures of the tip leakage flow in the linear compressor cascade, such as tip leakage vortex, tip leakage vortex separation and tip separation vortex. Large velocity gradients in the tip leakage vortex separation, tip leakage vortex, and tip separation vortex regions generate large production of the Reynolds stresses and turbulent kinetic energy. One of the most interesting features of the tip leakage flow is the bimodal velocity probability histograms of the v component due to the unsteady motion of the flow in the interaction region between the tip leakage vortex and tip leakage jet. The tip separation vortex, tip leakage vortex separation, and tip leakage vortex contain most of turbulent kinetic energy and generate the highest dissipation rate.
Relative motion of the endwall significantly affects the tip gap flow structures, especially in the near wall region. Compared to the stationary wall case, velocity gradients in the near wall region for the moving wall case are much smaller and lower velocity gradients in the near wall region cause the low production of Reynolds stresses and turbulent kinetic energy. Similar to the stationary wall case, high Reynolds stresses and turbulent kinetic energy values are mainly located in the vicinity of the tip leakage vortex and tip separation vortex region. The bimodal velocity probability histograms of the v component are also found at the same locations. The tip separation vortex with most of the turbulent kinetic energy generates the highest dissipation rate. The dissipation rate in the tip leakage vortex region is reduced with the decrease of turbulent kinetic energy under the moving wall effect.<br>Ph. D.
12
Luhende, Boniphace. "Towards a legal framework for preventing tax revenue leakage in the upstream oil and gas industry in Tanzania: an analysis of the concepts, methods and options available in a public trusteeship model of natural resource holding." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/26871.
Full textAbstract:
The recent discoveries of natural gas in Tanzania, estimated at about fifty-seven trillion cubic feet (tcf), have sparked tremendous hopes for socio-economic development in the country. While this optimism seems to be supported by conventional wisdom and economic insights, evidence from other oil-rich African countries shows that in spite of the ongoing oil and gas extraction, they are floundering in poverty, corruption and political instability. This phenomenal dichotomy between oil and gas wealth and socioeconomic development is referred to as the "resource curse". As this study demonstrates, the "curse" is partly a result of under-taxation. This study uses the resource curse study to analyze and evaluate tax-related challenges in the Tanzanian upstream oil and gas industry. In doing so, the study identifies three factors that may cause loss of potential tax revenues - referred to as "tax revenue leakage". First, the discretionary tax incentives, such as tax exemptions, lowering tax rates and special tax treatment, result in non-payment of taxes that would have otherwise been payable. Second, the International Oil Companies (IOCs) adopt a variety of techniques, such as transfer pricing, thin capitalization, corporate re-organization tax evasion and treaty shopping to exploit the loopholes or gaps in the tax laws to minimize, reduce or eliminate their tax obligations without being detected or punished. Third, corrupt Government officials willfully fail to collect taxes due, short levy taxes, grant undeserving tax incentives to the IOCs or divert revenues collected for their own account. All these factors demonstrate the close connection between under-taxation, corruption and tax avoidance. As this study argues, in the absence of counteractive measures, the Government will collect only a fraction of potential taxes, thus losing revenues required to finance development projects. The study establishes that Tanzania counteracts tax avoidance and tax evasion through anti-avoidance legislation. Tanzania also has accountability measures, which impose restraints on the exercise of public power and prevent corruption. The study concludes that although Tanzania has a competitive fiscal regime, anti-avoidance legislation and systems of accountability, the level of Government's tax revenue nevertheless depends on institutional capacity to detect, prevent and penalize tax avoidance schemes and corruption.
13
ARAÚJO, Morgana de Vasconcellos. "Estudo Numérico do Escoamento Bifásico de Água e Óleo em Conexões Tê na Presença de Vazamento." Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/529.
Full textAbstract:
Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-04-30T17:11:57Z
No. of bitstreams: 1
MORGANA DE VASCONCELLOS ARAÚJO - DISSERTAÇÃO PPGEQ 2014..pdf: 6485490 bytes, checksum: ac573f517948e0ae4fa9b0adcf3f0f41 (MD5)<br>Made available in DSpace on 2018-04-30T17:11:57Z (GMT). No. of bitstreams: 1
MORGANA DE VASCONCELLOS ARAÚJO - DISSERTAÇÃO PPGEQ 2014..pdf: 6485490 bytes, checksum: ac573f517948e0ae4fa9b0adcf3f0f41 (MD5)
Previous issue date: 2014-07-24<br>CNPq<br>Capes<br>Diante do número de acidentes com dutos na indústria petrolífera, diversas pesquisas vêm buscando o aperfeiçoamento das tecnologias de detecção de vazamento, fazendo-se necessário o conhecimento do comportamento do(s) fluido(s) no interior da tubulação. O trabalho tem como objetivo geral o estudo termofluidodinâmico do escoamento água-óleo em uma conexão tê na presença de vazamento. Para isto, foi construído um domínio
tridimensional e foi simulado o escoamento não isotérmico de água testando-se os modelos de turbulência k-Ɛ padrão, SST e RNG k-Ɛ e utilizando as equações da conservação de massa, momento e energia. Foram simulados os escoamentos bifásicos de água-óleo em uma conexão tê com vazamento, variando-se a fração volumétrica de óleo e as temperaturas das misturas nas seções de entrada. Comparando os perfis de velocidade e temperatura com dados experimentais observou-se que o modelo k-Ɛ padrão representou satisfatoriamente o comportamento do escoamento. Notou-se que quanto menor a fração volumétrica de óleo no escoamento, maior a pressão a montante do vazamento e que a região de encontro entre o duto principal e o duto secundário apresentou os maiores gradientes de pressão.<br>From the large number of accidents involving pipelines in the oil industry, many researcher
have the objective of improving the tecnologies of leak detection, where the knowledge of
the behavior (s) fluid (s) inside the pipe is necessary. The work aims to describe the thermofluid dynamics study of oil-water flow in a pipe with tee junction and with the presence of leakage. For this, a three-dimensional domain was built and it was simulated the nonisothermal flow of water by testing models of turbulence k-Ɛ standard, SST e RNG k-Ɛ, using the equations of conservation of mass, momentum and energy. Comparing the profiles of velocity and temperature with experimental data, it were observed that the k-Ɛ standard model well represented the flow pattern behavior satisfactorily. The water-oil two-phase flow in a tee junction with leakage was simulated, varying the volume fraction of oil mixtures and temperatures of the input sections. It was noted that the smaller the volume fraction of oil in the flow, the greater the pressure upstream of the leak and the region where the main duct is linked to the secondary duct showed higher pressure gradients.
14
Ho-ChinYu and 游和親. "Development of a solar powered wireless remotesensing system for oil leakage." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/05594413208996007346.
Full text
15
賴政何. "Study of Effects of Hydraulic Sleeves Length to the Oil Film Leakage." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94079870604402099426.
Full textAbstract:
碩士<br>國立彰化師範大學<br>電機工程學系<br>99<br>In this thesis, the influence of different contact areas between hydraulic cylinder sleeves and cylinders on the lifetime of hydraulic cylinder is investigated. Three different sizes of sleeves, 1810, 1815 and 1820, are utilized to test the durability by hydraulic-pneumatic test machine under the pressure 100 kgf/cm2, and investigate the amount of oil film exuding from cylinder.
Most of hydraulic with more exuding are horizontal big loading. Therefore, the study adopt horizontal hydraulic with 7.1kg loading, which naturally deflects the cylinder by the influence of gravitation into bending and shorten the test period. Due to the difficulty of collecting leaking oil, oil-absorbing paper is utilized to collect all the leaking and weighted by precise electronic scale to analyze the difference. The result proves different amount of oil film resulted from different length of sleeves and provided valuable reference for hydraulic designers.
16
Liao, Hong-Yu, and 廖宏瑜. "Environmentally Friendly Free Power and Free Refrigerant Leakage of Refrigerant Oil Feeder." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bczfr2.
Full textAbstract:
碩士<br>國立虎尾科技大學<br>機械與機電工程研究所在職專班<br>102<br>This study is to provide an environmentally friendly free power and free refrigerant leakage of refrigerant oil feeder. especially through its planning structure of the inner loop to add frozen oil at the same time ,it uses its pipeline loop of high and low pressure difference to add the oil and to reach the frozen performance. It does not need the extra power , and do not have a pipeline leading to the escape of the refrigerant completely ,and it operates conveniently and economically ; its structural design, mainly in the interior of at least one basal plane, are two independent channels. It can simultaneously go overlapping through the channels, and by adjusting the degree of valve to control the conduction and close. at the other two channels, each connected with a pressure gauge. According to it, one group of channels can be connected to the group on the high side of the pipeline loop, while the other group received the channel is set at the low-pressure side piping loop ,and the other end of the two -channel hose connect to the tank located in the freezer , so that they may pipe loop with its high and low pressure difference. The output of the high-pressure gas compressors refrigeration is introduced into tanks, then frozen oil will be pushed into the interior of the low-pressure passage, and it need not to inject it into the compressor. It can achieve the purpose of adding and adding jobs of refrigeration oil. The method in this study heavily relies entirely pipeline loop of high and low pressure difference, and it did not need provide any additional power. It has not the refrigerant escape, and it can enhance its convenience and economic efficiency of these operations.
17
Tsai, Jan-neng, and 蔡見能. "Study of Groundwater Contamination Potential and Pollutant Transportation during the Leakage of Oil Reservoir." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/nwur69.
Full textAbstract:
碩士<br>朝陽科技大學<br>環境工程與管理系碩士班<br>93<br>The contaminations caused by the leakage of oil storage tank are getting more and more serious based on EPA’s survey. Most of storage tanks are built on the ground. If the leakage happens, the oil will be contained inside the dike area on the surface and then leach into soil by gravity. Both soil and water will be contaminated by the oil and required remediation treatment. Prior to any treatment can be conducted, a screening process has to perform. In this study, several screening procedures have been made for a specific site. A Risk-Based Corrective Action (RBCA) was first applied to evaluate the risk for human health. After more geology data were provided, a flow simulation model was build.
Based on the results, it is shown that benzene has the most impact on the human health and benzene will be treated as an index chemical for further study. In the sensitivity study for the simulation model, hydraulic conductivity is the most sensitive parameter in this model besides oil physical properties. Water table is the second one. It is found That the model inside RBCA only suitable for homogeneous aquifer. More complicated model needs more geology data such as hydraulic conductivity. It means more measurements are required and may update the model based on new corrected data.
18
Wang, Yung-Nan, and 王永南. "The Discussion of the Gas Station Monitoring Facilities Setting up versus the Urgent Operation of Oil Leakage." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17792819457436347363.
Full textAbstract:
碩士<br>國立高雄應用科技大學<br>土木工程與防災科技研究所<br>98<br>The motive and purpose of this research is to figure out “The policy of the underground-water antipollution facility of the gas station and the management of monitoring facilities setting up” and to deeply analyze the goal of how the gas station corporations carry out it.
This research contains four directions which are the gas stations implement the in-and-out of the total amount control of oil, the effect analysis of the underground storage tank system by using what the monitoring way is, the reasonableness of often used underground storage tank system setting up standard, and the effect analysis of the measuring instrument. To investigate the efficiency of how the gas stations deal with the urgent oil leakage situation with above equipment. The research total provided 350 pieces of questionnaires and got 200 valid pieces back. To analyze and discuss the data by using SPSS and the result and suggestion are as the following:
1.Automatic oil level measurement and records is the more proper way to control the total amount of the in-and-out oil.
2.It is more suitable to monitor the underground storage tank system by “the airtight test mode”.
3.It is reasonable to use “the soil gas monitor well” as the normal establishment standard, but about the buried depth of the soil gas monitor well that some thought is too shallow, it thought that the better buried depth is 3.12 meters. Therefore, the suggestion of buried depth should be as deep as the fuel tank.
4.“The airtight test mode” is reasonable, but according to the survey that some thought must reduce the regular monitoring time and report the records in higher frequency. Therefore, the analysis result shows that the proper timing is once 1.67 years, but the suggestion of report timing is once 1.5 years.
5.Using Photo-Ionization Detector (PID) to do “the soil gas monitor” is best, and using “the dial of pressure test” to do “the airtight test” is the best way.