Effect of Contamination on the Lifetime of Hydraulic Oils and Systems

Kučera, Marián; Aleš, Zdeněk; Mareček, Ján; Máchal, Pavel

doi:10.11118/actaun201765041205

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Moreover, in the FTR they are protected from the effect of contaminants (dust, earth, other mixed fluids, etc. ), potential catalysts of oxidative reactions [41,42]. For these reasons, and based on the results of previous tests on hydraulic fluids with the first version of the FTR [30], the effects of 150 h hydraulic work on the aging of the two UTTO fluids were expected to be limited and barely visible, despite a work cycle that was heavier than real operating conditions.…”

Section: Discussionmentioning

confidence: 99%

Test Rig and Method for Comparative Evaluation of Conventional and Bio-Based Hydraulic Fluids and Lubricants for Agricultural Transmissions

Pochi¹,

Fanigliulo²,

Bisaglia³

et al. 2020

Sustainability

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The use of lubricants and hydraulic fluids of both mineral and synthetic origin in agricultural processes could have a deep impact on the environment as a result of their possible dispersion in the ground and aquifers. Replacing them with bio-based fluids, developed to provide good tribological properties and high biodegradability, could contribute to reducing their negative effects. The evaluation of the capacity of such innovative fluids to replace the conventional ones is based on work cycles lasting as long as their lifetime, during which their characteristics must prove to be at least equal to those of the fluids they replace. To shorten the evaluation process, CREA (Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia Agraria) developed a fluid test rig (FTR) and related test method, able to apply severe work cycles on small oil volumes, thereby accelerating the aging of the fluid beyond what typically occurs. This paper reports the results of the tests on FTR’s functionality carried out comparing two UTTO (Universal Tractor Transmission Oil) fluids: a widespread conventional fluid and an experimental vegetable-based oil. The FTR will permit, in a relatively short time, the assessment of the most promising formulations to be tested later under real working conditions, e.g., in agricultural tractors, reducing the risk of damage, before their ultimate introduction into the operating reality.

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Section: Discussionmentioning

confidence: 99%

Test Rig and Method for Comparative Evaluation of Conventional and Bio-Based Hydraulic Fluids and Lubricants for Agricultural Transmissions

Pochi¹,

Fanigliulo²,

Bisaglia³

et al. 2020

Sustainability

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“…Although there are hydraulic fluids on the market with reduced environmental impact, e.g. Exxon Mobil's offer (Exxon Mobil Corporation, 2017) and hydraulic fluids with low environmental impact (Kučera et al, 2013;Kučera et al, 2017), older generation fluids are still in use due to their favourable price. Moreover, the reduced impact does not mean that the impact has been eliminated.…”

Section: Introductionmentioning

confidence: 99%

Quality of hydraulic hoses with reduced service life

Orczykowski,

Korniluk,

Sobków

et al. 2024

Journal of Water and Land Development

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The impact of using rubber hydraulic hoses with a shortened service life on environmental pollution has not yet been raised in the scientific national literature. Most researchers focus on the analysis of used engine oils or contaminated fluid in hydraulic systems, rather than on their direct environmental impact. For some time now, the European market has seen an increase in imports of cheap rubber hydraulic hoses from countries outside the Community. There is a potential risk of negative environmental impacts from the use of these hoses if they do not meet appropriate quality standards. The study examined samples of hydraulic hoses purchased directly from the manufacturers or traders of rubber hydraulic hoses from countries outside the European Union. The products were tested for compliance with PN-EN 853:2015-05 and PN-EN 857:2015-05. Out of 14 fully tested hydraulic hoses, only 2 were found to comply with the applicable European standards. The results encourage further research to determine the impact of rubber hydraulic hoses with reduced service life on environmental and economic costs.

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“…For instance, the relative permittivity describes the polar status of the fluid, which can be affected by the presence of water, contaminants, and product of oxidation; the electric conductivity is an oil's specific parameter indicating contamination with other oils or substances; metallic particle contamination probably indicates machine wear and may result in overheating and component failure; and the presence of non-metallic particles can be caused by the bad sealing of some components against dust and debris from outside environment. The monitoring involves the entire oil volume circulating in the hydraulic system and can regard the above-mentioned parameters: Kinematic Viscosity [16,17]; water content [18]; wear metals [19]; particle contamination [20,21]; total acid number (TAN) [22]; and electric conductivity and relative permittivity [23,24]. Properly installed in machines and plants, along the flow lines of lubricants and hydraulic fluids, they operate continuous, real-time measurements of their chemical-physical properties, helping to evaluate their status [25].…”

Section: Introductionmentioning

confidence: 99%

Bench Testing of Sensors Utilized for In-Line Monitoring of Lubricants and Hydraulic Fluids Properties

Pochi¹,

Grilli²,

Fornaciari³

et al. 2021

Sensors

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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 fluids severe work cycles intended to accelerate oil ageing. The data of viscosity, permittivity, relative humidity, electric conductivity, particle contamination, and ferro-magnetic particles provided by the sensors were compared to the results of laboratory analyses made on oil samples taken during the tests with the aim of verifying the sensors measurements accuracy and reliability and selecting the more suitable ones to in-line oil conditions monitoring, in the perspective of introducing them also in field applications, e.g., on agricultural tractors, for preventing damages due to oil deterioration, and in managing the machine maintenance.

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Effect of Contamination on the Lifetime of Hydraulic Oils and Systems

Cited by 5 publications

References 13 publications

Test Rig and Method for Comparative Evaluation of Conventional and Bio-Based Hydraulic Fluids and Lubricants for Agricultural Transmissions

Test Rig and Method for Comparative Evaluation of Conventional and Bio-Based Hydraulic Fluids and Lubricants for Agricultural Transmissions

Quality of hydraulic hoses with reduced service life

Bench Testing of Sensors Utilized for In-Line Monitoring of Lubricants and Hydraulic Fluids Properties

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