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Artículos de revistas sobre el tema "Hydraulic fluids contamination"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 20 de febrero de 2023

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1

Paul, Sumit, Wolfgang Legner, Angelika Krenkow, Gerhard Müller, Thierry Lemettais, Francois Pradat, and Delphine Hertens. "Chemical Contamination Sensor for Phosphate Ester Hydraulic Fluids." International Journal of Aerospace Engineering 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/156281.

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The paper deals with chemical contamination monitoring in phosphate-ester-based hydraulic fluids using nondispersive infrared (NDIR) optical absorption. Our results show that NDIR monitoring allows detecting the take-up of water into such fluids and their hydrolytic disintegration as these become additionally stressed by Joule heating. Observations on the O–H stretching vibration band (3200–3800 ) are used for determining the free water content (0–1.5%) and the Total Acid Number (0–1 mgKOH/g). Both quantities can be assessed by monitoring the strength and the asymmetry of the O–H vibration ban
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2

Aliboyev, B. A. "Reliability of tractor hydraulic systems in the context of purity of power fluid." Traktory i sel hozmashiny 82, no. 6 (June 15, 2015): 26–29. http://dx.doi.org/10.17816/0321-4443-65416.

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The article is dedicated to review and analysis of control and estimation methods of power fluid purity in order to provide reliability of tractor hydraulic systems. It highlights the results of experimental studies concerning contamination of hydraulic system fluids. Comparative analysis of foreign standards of hydraulic system fluids control is performed.
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3

Majdan, R., Z. Tkáč, B. Stančík, R. Abrahám, I. Štulajter, P. Ševčík, and M. Rášo. "Elimination of ecological fluids contamination in agricultural tractors." Research in Agricultural Engineering 60, Special Issue (December 30, 2014): S9—S15. http://dx.doi.org/10.17221/27/2013-rae.

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This contribution presents the elimination of pollution for ecological fluids of UTTO (universal tractor transmission oils) type in agricultural tractors. The common oil filling of the transmission and hydraulic system is polluted by residues of old fillings from attachments such as ploughs, trailers, etc. In the tractor Zetor Forterra 114 41, a newly developed synthetic ecological fluid HEPR (VDMA 24568) was applied. The oil showed pollution limits after completing 900 engine hours. For this reason, a filtration device was designed to clean mainly biodegradable fluids UTTO. On the basis of fl
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4

Main, B. G. "Explosion Hazards in Offshore Motion Compensators." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 199, no. 4 (November 1985): 229–35. http://dx.doi.org/10.1243/pime_proc_1985_199_029_02.

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Auto-ignition data for phosphate ester hydraulic fluids and explosion initiators in high pressure hydraulic/pneumatic motion compensators are reviewed. Data obtained in this study highlight the potential increased danger due to contamination of fire-resistant fluids.
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5

SCHOLZ, Dieter. "Routes of Aircraft Cabin Air Contamination from Engine Oil, Hydraulic and Deicing Fluid." INCAS BULLETIN 14, no. 1 (March 7, 2022): 153–70. http://dx.doi.org/10.13111/2066-8201.2022.14.1.13.

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Purpose: This paper discusses potential contamination of the air in passenger aircraft cabins. It gives an overview of cabin air contamination basics. It further names possible contamination sources and possible routes of contamination. – Methodology: Evidence follows from a review of material found on the Internet and from the documentation of a visit to an aircraft recycling site. Parts were retrieved at the site and investigated later with more time. – Findings: Jet engine seals leak oil in small quantities. Metallic nanoparticles are found in the oil and have been detected in human fatty t
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6

Kučera, Marián, Zdeněk Aleš, Jan Mareček, and Pavel Máchal. "Effect of Contamination on the Lifetime of Hydraulic Oils and Systems." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 65, no. 4 (2017): 1205–12. http://dx.doi.org/10.11118/actaun201765041205.

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The extensions of service‑lives regarding hydraulic fluids is gaining prominence due to several considerations including environmental pollution, conservation of natural resources and the economic benefits associated with extended service‑life. The presented methods for testing the durability and oxidation stabilities of hydraulic fluids can be simultaneously used in two ways. Firstly for comparing different hydraulic biooils and for selecting more adequate oils with higher oxidation stabilities and longer service lifetimes and secondly for the development of a prognostic model for an accurate
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7

Owens, E. H., G. H. Smith, and I. A. Reading. "An instrument for measurement of water contamination in hydraulic fluids." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 2 (February 2007): 167–70. http://dx.doi.org/10.1243/09544070jauto457.

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8

Theissen, Heinrich W., David G. Holt, David K. Wills, and S. W. Dean. "Effects of Contamination of Biobased Hydraulic Fluids with Mineral Oil." Journal of ASTM International 6, no. 1 (2009): 101598. http://dx.doi.org/10.1520/jai101598.

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9

Hunt, T. M. "Particle contamination and filtration of hydraulic fluids, lubricants and fuels." Tribology International 21, no. 5 (October 1988): 297–98. http://dx.doi.org/10.1016/0301-679x(88)90012-6.

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10

Janoško, I., T. Polonec, and S. Lindák. "Performance parameters monitoring of the hydraulic system with bio-oil." Research in Agricultural Engineering 60, Special Issue (December 30, 2014): S37—S43. http://dx.doi.org/10.17221/32/2013-rae.

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In environmental terms, hydraulic fluids used in the hydraulic system of municipal vehicles represent problems related to a potential leakage from the system into the environment and the subsequent contamination of groundwater and soil. More environment-friendly way is to use green hydraulic fluids that are biodegradable in accidents. This paper aims to investigate the possibilities of biodegradable oil application and its adaptation in the hydraulic systems of municipal vehicles by monitoring the impact of the bio-oil Mobil EAL 46 ESSO on the performance parameters as flow, efficiency, durabi
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11

Helwig, Andreas, Gerhard Müller, and Sumit Paul. "Health Monitoring of Aviation Hydraulic Fluids Using Opto-Chemical Sensor Technologies." Chemosensors 8, no. 4 (December 13, 2020): 131. http://dx.doi.org/10.3390/chemosensors8040131.

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Passenger safety requires that in commercial airplanes hydraulic actuators be powered by fire-resistant hydraulic fluids. As a downside, such fluids are hygroscopic which means that these tend to accumulate humidity from the environment and that the dissolved humidity tends to produce acidity which can corrode all kinds of metallic components inside a hydraulic system. As such damage in safety-critical subsystems is hard to localize and expensive to repair, sensor technologies are required which allow the state of water contamination and fluid degradation to be routinely checked and necessary
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12

Khan, Thawhid, Matthew Broderick, and Chris M. Taylor. "Investigating the industrial impact of hydraulic oil contamination on tool wear during machining and the development of a novel quantification methodology." International Journal of Advanced Manufacturing Technology 112, no. 1-2 (November 22, 2020): 589–600. http://dx.doi.org/10.1007/s00170-020-06370-y.

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AbstractWater based metalworking fluids (MWFs) commonly used for cooling and lubrication during machining are utilised in combination with cutting tools, work materials, fixtures and machine tools. However, they are an often overlooked component of the overall machining process, despite the fact that in some reported cases MWF costs were twice that of tooling costs. During its life cycle in a machine tool, the MWF is exposed to changes due to a range of factors which impact its quality and longevity. The key process variables (KPVs) reviewed in this study are MWF concentration, hydraulic (tram
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13

Mouallem, Carlos, Wilson Trigueiro de Sousa, Ivo Eyer Cabral, and Adilson Curi. "Perspectives for use of hydraulic fracturing in oil and gas production." Rem: Revista Escola de Minas 67, no. 4 (December 2014): 373–78. http://dx.doi.org/10.1590/0370-44672014670168.

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Hydraulic fracturing emerges currently, all over the world, as one of the more strategic techniques used by companies in the oil exploitation sector. This technique is characterized by its high productivity and profit in relation to conventional methods of hydrocarbon exploitation. However, in many countries, as is the case of Brazil, there are several divergences considering the employment of this methodology. Many renowned researchers attest that there are several irreversible environmental impacts generated by the use of this methodology. Among the main environmental impacts are the risk of
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14

Martínez-Sánchez, Dilan Arturo, and Giovanny Jiménez Díaz. "Hydraulic fracturing considerations: Insights from analogue models, and its viability in Colombia." Earth Sciences Research Journal 23, no. 1 (January 1, 2019): 5–15. http://dx.doi.org/10.15446/esrj.v23n1.69760.

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Fracking is being considered around the world as a potential method in the hydrocarbons extraction given the increase of production in USA and Canada during the last years with its implementation. The most criticized feature of the technique of fracking is the contamination of underground waters by fluids connected through the generated and/or pre-existing fractures. This work evaluates the viability of fracking in Colombian territory based in the study of the analogue models, considering the elastic properties of the reservoir rocks using gelatin, sand and clay that apply scaled pressure (lit
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15

Dakheel Almaliki, Alaa J., Mohammed J. K. Bashir, and Juan F. Llamas Borrajo. "Appraisal of groundwater contamination from surface spills of fluids associated with hydraulic fracturing operations." Science of The Total Environment 815 (April 2022): 152949. http://dx.doi.org/10.1016/j.scitotenv.2022.152949.

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16

Pichtel, John. "Oil and Gas Production Wastewater: Soil Contamination and Pollution Prevention." Applied and Environmental Soil Science 2016 (2016): 1–24. http://dx.doi.org/10.1155/2016/2707989.

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During oil and natural gas production, so-called “produced water” comprises the largest byproduct stream. In addition, many oil and gas operations are augmented via injection of hydraulic fracturing (HF) fluids into the formation. Both produced water and HF fluids may contain hundreds of individual chemicals, some known to be detrimental to public health and the environment. Oil and gas production wastewater may serve a range of beneficial purposes, particularly in arid regions, if managed correctly. Numerous treatment technologies have been developed that allow for injection, discharge to the
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17

Negrini, Daniela, Alberto Passi, Katia Bertin, Federica Bosi, and Helge Wiig. "Isolation of pulmonary interstitial fluid in rabbits by a modified wick technique." American Journal of Physiology-Lung Cellular and Molecular Physiology 280, no. 5 (May 1, 2001): L1057—L1065. http://dx.doi.org/10.1152/ajplung.2001.280.5.l1057.

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Interstitial fluid protein concentration (Cprotein) values in perivascular and peribronchial lung tissues were never simultaneously measured in mammals; in this study, perivascular and peribronchial interstitial fluids were collected from rabbits under control conditions and rabbits with hydraulic edema or lesional edema. Postmortem dry wicks were implanted in the perivascular and peribronchial tissues; after 20 min, the wicks were withdrawn and the interstitial fluid was collected to measure Cprotein and colloid osmotic pressure. Plasma, perivascular, and peribronchial Cproteinvalues averaged
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18

Llewellyn, Garth T., Frank Dorman, J. L. Westland, D. Yoxtheimer, Paul Grieve, Todd Sowers, E. Humston-Fulmer, and Susan L. Brantley. "Evaluating a groundwater supply contamination incident attributed to Marcellus Shale gas development." Proceedings of the National Academy of Sciences 112, no. 20 (May 4, 2015): 6325–30. http://dx.doi.org/10.1073/pnas.1420279112.

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High-volume hydraulic fracturing (HVHF) has revolutionized the oil and gas industry worldwide but has been accompanied by highly controversial incidents of reported water contamination. For example, groundwater contamination by stray natural gas and spillage of brine and other gas drilling-related fluids is known to occur. However, contamination of shallow potable aquifers by HVHF at depth has never been fully documented. We investigated a case where Marcellus Shale gas wells in Pennsylvania caused inundation of natural gas and foam in initially potable groundwater used by several households.
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19

Máchal, Pavel, Radoslav Majdan, Zdenko Tkáč, Bohuslav Stančík, Rudolf Abrahám, Ivan Štulajter, Peter Ševčík, and Milan Rášo. "Design and verification of additional filtration for the application of ecological transmission and hydraulic fluids in tractorc." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 5 (2013): 1305–11. http://dx.doi.org/10.11118/actaun201361051305.

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This contribution presents the design and function verification of additional filtration. It is intended for the common transmission and hydraulic oil filling of tractors. The main role of this filtration concept is to ensure a high level of oil cleanness as a condition for the application of ecologic fluids in tractors. The next one is to decrease the wear of lubricated tractor components, the degradation of oil and eventually to extend the interval of oil change. The designed additional filtering is characterized by ease installation through the use of quick couplings and hoses to the extern
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20

Almaliki, Alaa Jasim Dakheel, Mohammed J. K. Bashir, and Juan F. Llamas Borrajo. "The Impact of Climate Change and Soil Classification on Benzene Concentration in Groundwater Due to Surface Spills of Hydraulic Fracturing Fluids." Water 14, no. 8 (April 8, 2022): 1202. http://dx.doi.org/10.3390/w14081202.

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Hydraulic fracturing drilling technology can cause a high risk of surface spill accidents and thus water contamination. Climate change together with the high water demand and rapid increase in industrial and agricultural activities are valued reasons why we should all care about the availability of water resources and protect them from contamination. Hence, the purpose of this study is to estimate the risk associated with a site contaminated with benzene from oil spillage and its potential impact on groundwater. This study focused on investigating the impact of soil variability and water table
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21

Pochi, Daniele, Renato Grilli, Laura Fornaciari, Monica Betto, Stefano Benigni, and Roberto Fanigliulo. "Bench Testing of Sensors Utilized for In-Line Monitoring of Lubricants and Hydraulic Fluids Properties." Sensors 21, no. 24 (December 8, 2021): 8201. http://dx.doi.org/10.3390/s21248201.

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This work reports the results of a study on the behaviour of five sensors recently developed for oil conditions monitoring, installed in-line in an experimental test rig for lubricants. The tests were carried out on seven oils of different origins (one synthetic ester, two bio-based synthetic esters, four vegetable oils) and use (two UTTOs and five hydraulic oils), under controlled working conditions, according to a specially designed test method. At first, the study concerned the identification of the conditions for the correct sensors’ installation. Then, the tests started applying to the fl
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22

Zhang, Lifu, Michael Tice, and Berna Hascakir. "A Laboratory Study of the Impact of Reinjecting Flowback Fluids on Formation Damage in the Marcellus Shale." SPE Journal 25, no. 02 (January 21, 2020): 788–99. http://dx.doi.org/10.2118/195336-pa.

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Summary Reuse of flowback water in hydraulic fracturing is usually used by industry to reduce consumption, transportation, and disposal cost of water. However, because of complex interactions between injected water and reservoir rocks, induced fractures may be blocked by impurities carried by flowback and mineral precipitation by water/rock interactions, which causes formation damage. Therefore, knowledge of flowback water/rock interactions is important to understand the changes within the formation and effects on hydraulic fracturing performance. This study focuses on investigating flowback w
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23

Ahmed, Amna, Teresa Zhu, and Amna Majeed. "Taking the hydro out of hydrofracturing: Application of ultra-light weight proppants to cryogenic liquid nitrogen as a fracturing fluid." University of Ottawa Science Undergraduate Research Journal 1 (August 23, 2018): 57. http://dx.doi.org/10.18192/osurj.v1i1.3711.

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In the last decade, hydraulic fracturing has rapidly gained popularity worldwide, emerging as the leading method of natural gas extraction in the United States. However, the practice remains controversial due to its contribution to greenhouse gas emissions and the contamination of freshwater used in fracturing fluids. Although waterless fracturing fluids have been developed, including those using N2, CO2, oil, and alcohol, their application has been limited largely due to reduced fracturing power. Recent research has demonstrated that cryogenic nitrogen may prove a viable alternative, if this
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24

Song, Charles C. S., and Mingshun Yuan. "A Weakly Compressible Flow Model and Rapid Convergence Methods." Journal of Fluids Engineering 110, no. 4 (December 1, 1988): 441–45. http://dx.doi.org/10.1115/1.3243575.

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A weakly compressible flow model for small Mach number flows is applied to the computation of steady and unsteady inviscid flows. The equations of continuity and motion are decoupled from the energy equation, but, unlike the equations for incompressible fluids, these equations retain the ability to represent rapidly changing flows such as hydraulic transients and hydroacoustics. Two methods to speed up the process of convergence when an explicit method is used to calculate steady incompressible flows are proposed. The first method which is quite similar to the artificial compressiblity method
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25

Peng, Weihong, Menglin Du, Feng Gao, Xuan Dong, and Hongmei Cheng. "A New Analysis Model for Potential Contamination of a Shallow Aquifer from a Hydraulically-Fractured Shale." Energies 11, no. 11 (November 1, 2018): 3010. http://dx.doi.org/10.3390/en11113010.

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Hydraulic fracturing (HF) is widely used in shale gas development, which may cause some heavy metals release from shale formations. These contaminants could transport from the fractured shale reservoirs to shallow aquifers. Thus, it is necessary to assess the impact of pollution in shallow aquifers. In this paper, a new analysis model, considering geological distributions, discrete natural fractures (NFs) and faults, is developed to analyze the migration mechanism of contaminants. Furthermore, the alkali erosion of rock caused by high-pH drilling of fluids, is considered in this paper. The num
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26

Osenbrück, Karsten, Eva Blendinger, Carsten Leven, Hermann Rügner, Michael Finkel, Natalia Jakus, Hartmut Schulz, and Peter Grathwohl. "Nitrate reduction potential of a fractured Middle Triassic carbonate aquifer in Southwest Germany." Hydrogeology Journal 30, no. 1 (December 7, 2021): 163–80. http://dx.doi.org/10.1007/s10040-021-02418-9.

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AbstractNitrate reduction constitutes an important natural mechanism to mitigate the widespread and persistent nitrate contamination of groundwater resources. In fractured aquifers, however, the abundance and accessibility of electron donors and their spatial correlation with groundwater flow paths are often poorly understood. In this study, the nitrate reduction potential of a fractured carbonate aquifer in the Upper Muschelkalk of SW Germany was investigated, where denitrification is due to the oxidation of ferrous iron and reduced sulfur. Petrographical analyses of rock samples revealed con
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27

Ułanowicz, Leszek, Grzegorz Jastrzębski, Michał Jóźko, Ryszard Sabak, and Paweł Szczepaniak. "Hydraulic plunger pump contamination sensitivity evaluation." Journal of KONBiN 48, no. 1 (December 1, 2018): 371–83. http://dx.doi.org/10.2478/jok-2018-0061.

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Abstract The correct operation of the hydraulic pump and achieving the assumed durability depends on the purity of the used working fluid. The research paper discusses a method for evaluating the contamination sensitivity of a hydraulic plunger pump. The theoretical grounds for evaluating the contamination sensitivity of hydraulic plunger pumps of a hydraulic drive based on the contamination sensitivity factor were presented. An example of evaluating contamination sensitivity of an NP-34M hydraulic plunger pump was discussed.
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28

Cozzens, D. A., P. D. Rao, W. W. Olson, J. W. Sutherland, and J. Mark Panetta. "An Experimental Investigation into the Effect of Cutting Fluid Conditions on the Boring of Aluminum Alloys." Journal of Manufacturing Science and Engineering 121, no. 3 (August 1, 1999): 434–39. http://dx.doi.org/10.1115/1.2832700.

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Boring tests were conducted on aluminum alloys to investigate the effects of cutting fluid on machining performance. Statistically designed experiments were used to examine the role of such process variables as tool geometry, cutting conditions, work material, cutting fluid presence, cutting fluid concentration, and hydraulic oil contamination of cutting fluid. Responses for the boring tests were surface texture, forces, and observed built-up edge (BUE). The results indicate that the cutting fluid presence, oil concentration, and hydraulic oil contamination do not play a significant role in pr
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29

Dusa, Petru, Eugen Purice, Radu Lupascu, Iustina Ripanu, and Gabriel Fandarac. "Configuring a system for hydraulic oil contamination management." MATEC Web of Conferences 178 (2018): 04008. http://dx.doi.org/10.1051/matecconf/201817804008.

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Through contamination, we can understand anything foreign to a hydraulic system. In this paper we only refer to particle contamination. Analyzing and optimizing processes with regard to component cleanliness and fluid purity is the target of contamination management. The paper proposes a conceptual installation solution for the use of particle counters in order to optimize the measurement process. There is also a way of using the facility within a contamination management system.
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30

Jozef Krilek, Jozef, Jan Kovach, Tomash Kuvik, and Lucia Dobrotova. "Analysis of the hydraulic oil to drive band sawmill." Scientific Bulletin of UNFU 29, no. 10 (December 26, 2019): 89–92. http://dx.doi.org/10.36930/40291018.

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Transport and material handling is a sum of technological processes in the wood-processing industry. Hydraulic drives are one of the drive options used as a basic part of the transport – handling machines. Contamination control involves preventing contaminants from entering a hydraulic system and placing filters in strategic locations throughout the system to trap any contaminants to find their way into the fluid. But for critical equipment, a successful contamination control program must also include regular assessment of the hydraulic fluid cleanliness. It must be often done every two to six
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31

Elshahawi, Hani, Mohamed Naguib Hashem, Daniel McKinney, Mario Ardila, and Cosan Ayan. "The Power of Real-Time Monitoring and Interpretation in Wireline Formation Testing-Case Studies." SPE Reservoir Evaluation & Engineering 10, no. 03 (June 1, 2007): 241–50. http://dx.doi.org/10.2118/94708-pa.

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Summary Modern wireline formation testers (WFTs) are able to collect a massive amount of data at multiple depths, thus helping to quantify changes in rock and fluid properties along the wellbore, to define hydraulic flow units, and to understand the reservoir architecture. They are being used routinely in a wide range of applications spanning pressure and mobility profiling vs. depth, fluid sampling, downhole fluid analysis (DFA), interval pressure-transient testing (IPTT), and microfracturing. Because of the complex tool strings and the elaborate operational aspects involved in wireline forma
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32

Gunko, Iryna, Mykola Stadnik, Serhiy Shargorodskiy, and Volodymyr Rutkevych. "COMPREHENSIVE FILTRATION SYSTEM FOR CLOSED HYDROSYSTEMS OF AGRICULTURAL EQUIPMENT." ENGINEERING, ENERGY, TRANSPORT AIC, no. 1(112) (March 23, 2021): 113–25. http://dx.doi.org/10.37128/2520-6168-2021-1-13.

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The article the issue of increasing the durability and reliability of units of closed hydraulic systems of agricultural equipment by ensuring the purity of the working fluid is considered. The analysis of existing systems of filtration of working liquid for the closed hydraulic systems of the agricultural equipment is resulted. It is noted that the basis of the created and implemented filtration systems are filtration installations in pressure mains, including with automatic washing, which provide filtration fineness up to 50 μm, filter elements which have high strength, reliability and are ca
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33

Hui, Ji, Nie Song-Lin, and Bai Xiao-Rong. "Simulation on mechanism of contamination mitigation through Higee and hydrocyclone techniques in fluid power system." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 1 (December 13, 2016): 77–93. http://dx.doi.org/10.1177/0954408916684161.

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In this study, an innovative Higee hydraulic oil purification device capable of removing the solid particle contaminants and water moisture simultaneously is developed for dealing with the contamination control problem of fluid power systems. The purification device is considered as a combination of two units (hydrocyclone separator and rotating packed bed) according to different separation functions. The mathematical models about the migration regularity and dynamic behavior of different phases have been established, in which discrete phase model model is employed to simulate the solid partic
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34

Kosiba, J., Z. Tkáč, Ľ. Hujo, B. Stančík, and I. Štulajter. "The operation of agricultural tractor with universal ecological oil." Research in Agricultural Engineering 59, Special Issue (December 13, 2013): S27—S33. http://dx.doi.org/10.17221/48/2012-rae.

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This contribution presents the results of the research into the characteristics of ecological oil labelled MOL Farm UTTO Synt in the tractor operating conditions. Biodegradable fluid was applied in the gear and hydraulic circuits of the tractor Zetor Forterra 114 41. The fluid was assessed for contamination and lubrication properties by its effect on the wear of tractor hydraulic pump during the application. The hydraulic pump was removed from the tractor at specified time intervals because of its technical condition relating to the flow efficiency. The measurements were calculated as flow eff
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35

Angelaki, Anastasia, Alkiviadis Dionysidis, Parveen Sihag, and Evangelia E. Golia. "Assessment of Contamination Management Caused by Copper and Zinc Cations Leaching and Their Impact on the Hydraulic Properties of a Sandy and a Loamy Clay Soil." Land 11, no. 2 (February 14, 2022): 290. http://dx.doi.org/10.3390/land11020290.

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Soil hydraulic properties are crucial to agriculture and water management and depend on soil structure. The impact of Cu and Zn cations on the hydraulic properties of sandy and loamy clay soil samples of Central Greece, was investigated in the present study. Metal solutions with increased concentrations were used to contaminate the soil samples and the effect on hydraulic properties was evaluated, demonstrating the innovation of the current study. The soil samples were packed separately into transparent columns and the initial values of hydraulic conductivity, cumulative infiltration, infiltra
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Domagała, Mariusz, Hassan Momeni, Joanna Fabiś-Domagała, Grzegorz Filo, and Paweł Lempa. "Simulations of Safety Vales for Fluid Power Systems." System Safety: Human - Technical Facility - Environment 1, no. 1 (March 1, 2019): 670–77. http://dx.doi.org/10.2478/czoto-2019-0085.

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AbstractHydraulic power systems are widely used in heavy machinery. Safety of such a systems have a major importance due to the fact that any failure may cause environmental contamination or serious injury. One of the component which protects hydraulic drive systems against excessive rising of working pressure is a safety valve which aim is to maintain pressure in the systems below acceptable level. Pressure control valves which plays important role in a hydraulic systems may have very simple or complex structure. Even in case of the simplest structure of such valve modeling is not an easy tas
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37

Hujo, Lubomir, Jozef Nosian, Marcin Zastempowski, Jan Kosiba, Jerzy Kaszkowiak, and Matej Michalides. "Laboratory tests of the hydraulic pump operating load with monitoring of changes in the physical properties." Measurement and Control 54, no. 3-4 (February 2, 2021): 243–51. http://dx.doi.org/10.1177/0020294020983385.

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The present article deals with the physical properties monitoring of the transmission-hydraulic fluid, and changes of those properties due the operating load of the hydraulic pump in laboratory conditions. Tests of the transmission-hydraulic fluid were performed in laboratory conditions with the simulation of the operating load, so as to simulate the real conditions under which hydraulic circuit of the agricultural tractors operates. The universal transmission-hydraulic fluid was subjected to analysis, where the samples of the fluid were taken sequentially according to the chosen methodology a
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38

Baryshev, V. I., and V. V. Panov. "Key deterioration factors of hydrostatic bearings of the axial-piston hydraulic machines." Traktory i sel hozmashiny 80, no. 1 (January 15, 2013): 34–37. http://dx.doi.org/10.17816/0321-4443-65912.

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Formation of porous stoppers in delivery capillaries of hydrostatic bearings and their obliteration are substantiated as secondary factors of bearings deterioration under the impact of working fluids contaminations. Findings of the laboratory investigations are given.
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39

Pimonov, Igor, Igor Pohorilyi, and Maksim Fedyuchkov. "Establishment of rational parameters of temperature of working liquid in the hydraulic drive of the excavator of the fourth dimensional group at different equipment." Bulletin of Kharkov National Automobile and Highway University, no. 95 (December 16, 2021): 98. http://dx.doi.org/10.30977/bul.2219-5548.2021.95.0.98.

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The article considers the hydraulic drive of a modern excavator on which the influence of the working fluid temperature on the power is established, depending on the technical condition of the hydraulic elements. Studies have shown that new pumps and which have operating wear, have different rational temperature of the working fluid. It is impossible to imagine modern construction machines without equipping them with a hydraulic drive. The operation of the hydraulic drive largely determines the efficiency of operation of both a single machine and the entire fleet, which consists of new and old
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40

Barbour, S. L., and N. Yang. "A review of the influence of clay–brine interactions on the geotechnical properties of Ca-montmorillonitic clayey soils from western Canada." Canadian Geotechnical Journal 30, no. 6 (December 1, 1993): 920–34. http://dx.doi.org/10.1139/t93-090.

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Natural Ca-montmorillonite clay soils or engineered clay barriers in western Canada are often used to contain brine generated from the surface disposal of potash tailings or from drilling activities associated with the oil and gas industry. The performance of these barriers has ranged from excellent to poor. The influence of salt brines on the geotechnical properties of these soils has been recognized as a potentially important factor for some time. It has been well documented in the literature that the behavior of clayey soils is strongly influenced by physicochemical interactions between cla
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41

Hay, Nicola. "Because looks aren't everything. A meter for contamination testing of hydraulic fluid." Electronics Education 1994, no. 2 (1994): 25–27. http://dx.doi.org/10.1049/ee.1994.0051.

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42

Park, Gun, Hyungchul Yoon, and Ki-Nam Hong. "Proposed Equations for Calculating Dynamic Hydraulic Pressure in a Rectangular Structure." Applied Sciences 10, no. 23 (November 26, 2020): 8406. http://dx.doi.org/10.3390/app10238406.

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When damaged by an earthquake, a general structure suffers only primary damage such as in the structure’s collapse, whereas a fluid storage structure can cause secondary damage such as environmental contamination or personal injury due to leakage of its internal fluid. In this study, the flow characteristics of fluid inside a fluid storage structure during an earthquake were analyzed, and an equation to calculate the dynamic hydraulic pressure of the fluid acting on the structure during an earthquake was proposed. The seismic load applied to the fluid storage structure was modified to satisfy
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43

He, Zhenghui, Mingqi Cheng, and Xiaoping Ji. "AN ANALYSIS OF THE PARTICULATE CONTAMINATION IN HYDRAULIC FLUID USING PATTERN RECOGNITION TECHNIQUES." Proceedings of the JFPS International Symposium on Fluid Power 1989, no. 1 (1989): 595–99. http://dx.doi.org/10.5739/isfp.1989.595.

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44

Shanbhag, Vignesh V., Thomas J. J. Meyer, Leo W. Caspers, and Rune Schlanbusch. "Defining acoustic emission-based condition monitoring indicators for monitoring piston rod seal and bearing wear in hydraulic cylinders." International Journal of Advanced Manufacturing Technology 115, no. 9-10 (May 28, 2021): 2729–46. http://dx.doi.org/10.1007/s00170-021-07340-8.

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AbstractFluid leakage from hydraulic cylinders is a major concern for the offshore industries as it directly affects hydraulic cylinder energy efficiency and causes environmental contamination. There have been attempts made in literature to develop robust condition monitoring techniques for hydraulic cylinders. However, most of these studies were performed to identify degradation of single components. Therefore, in this study, the aim is to monitor degradation of multiple components simultaneously in hydraulic cylinders using acoustic emissions. Experiments performed consist of three test phas
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45

Fang, Sheng, and Xian Lin Gen. "Managing Varnish of Turbine Oil." Advanced Materials Research 842 (November 2013): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amr.842.341.

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Varnish now becomes the severe problem of gas turbine, nuclear power plant and other industry which use lubricant oil and hydraulic fluid. The cause of varnish formation is heat, oxidation and contamination. Varnish can cause many turbine problems. The Membrane Patch Colorimetry (MPC) test can be used to measure varnish. Partial or all oil change, Filtration with Cellulose Media and System Chemical Cleaning can be applied to mitigate varnish.
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46

Otto, Christopher, Svenja Steding, Morgan Tranter, Torsten Gorka, Mária Hámor-Vidó, Wioleta Basa, Krzysztof Kapusta, István Kalmár, and Thomas Kempka. "Numerical Analysis of Potential Contaminant Migration from Abandoned In Situ Coal Conversion Reactors." Advances in Geosciences 58 (November 21, 2022): 55–66. http://dx.doi.org/10.5194/adgeo-58-55-2022.

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Abstract. In the context of a potential utilisation of coal resources located in the Mecsek mountain area in Southern Hungary, an assessment of groundwater pollution resulting from a potential water-borne contaminant pool remaining in in situ coal conversion reactors after site abandonment has been undertaken in the scope of the present study. The respective contaminants may be of organic and inorganic nature. A sensitivity analysis was carried out by means of numerical simulations of fluid flow as well as contaminant and heat transport including retardation to assess spatial contaminant migra
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47

Quigley, R. M., F. Fernandez, E. Yanful, T. Helgason, A. Margaritis, and J. L. Whitby. "Hydraulic conductivity of contaminated natural clay directly below a domestic landfill." Canadian Geotechnical Journal 24, no. 3 (August 1, 1987): 377–83. http://dx.doi.org/10.1139/t87-048.

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The hydraulic conductivity of natural clays in the 1.5 m contamination zone below a 15 year old domestic waste landfill has been determined.Water-soluble contaminants such as chloride, sodium, and dissolved organic carbon have migrated about 1.0 m compared with only 15 cm for copper, zinc, iron, lead, and manganese. The migration, primarily by diffusion, has rendered the clay perfect for assessment of clay–leachate compatibility with respect to hydraulic conductivity, k.Oedometer tests on tube samples of the clay yielded k values of 1.4 × 10−8 cm/s with a slight decrease to about 1 × 10−8 cm/s
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48

Yılmaz, Özgür, Murat Aksoy, and Zehan Kesilmiş. "Investigation of the Relationship between Vibration Signals Due to Oil Impurity and Cavitation Bubbles in Hydraulic Pumps." Electronics 11, no. 10 (May 12, 2022): 1549. http://dx.doi.org/10.3390/electronics11101549.

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Although hydraulic pumps are frequently used in daily life, improper use due to oil analysis or oil contamination is ignored. There is no instantaneous inspection; instead, the oil is changed periodically at certain times, whether it is contaminated or not. Hydraulic systems operate based on Pascal’s law, which states that the fluid will distribute the pressure equally to every point in a closed area. The fluid oil taken from an oil reservoir is moved into the pump by engine power. During this movement, as it passes through different pressure areas and different sections, undesirable events su
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49

Yuan, Chenggang, Vinrea Lim Mao Lung, Andrew Plummer, and Min Pan. "Theoretical and Experimental Studies of a Digital Flow Booster Operating at High Pressures and Flow Rates." Processes 8, no. 2 (February 10, 2020): 211. http://dx.doi.org/10.3390/pr8020211.

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The switched inertance hydraulic converter (SIHC) is a new technology providing an alternative to conventional proportional or servo-valve-controlled systems in the area of fluid power. SIHCs can adjust or control flow and pressure by means of using digital control signals that do not rely on throttling the flow and dissipation of power, and provide hydraulic systems with high-energy efficiency, flexible control, and insensitivity to contamination. In this article, the analytical models of an SIHC in a three-port flow-booster configuration were used and validated at high operating pressure, wi
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50

Taherdangkoo, Reza, Alexandru Tatomir, Mohammad Taherdangkoo, Pengxiang Qiu, and Martin Sauter. "Nonlinear Autoregressive Neural Networks to Predict Hydraulic Fracturing Fluid Leakage into Shallow Groundwater." Water 12, no. 3 (March 17, 2020): 841. http://dx.doi.org/10.3390/w12030841.

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Hydraulic fracturing of horizontal wells is an essential technology for the exploitation of unconventional resources, but led to environmental concerns. Fracturing fluid upward migration from deep gas reservoirs along abandoned wells may pose contamination threats to shallow groundwater. This study describes the novel application of a nonlinear autoregressive (NAR) neural network to estimate fracturing fluid flow rate to shallow aquifers in the presence of an abandoned well. The NAR network is trained using the Levenberg–Marquardt (LM) and Bayesian Regularization (BR) algorithms and the result
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