scholarly journals Researches concerning the hydraulic oil degradation process in gear pumps

2021 ◽  
Vol 3 (2) ◽  
pp. 43-52
Author(s):  
Alexandru Daniel Marinescu ◽  
Alexandru Valentin Radulescu ◽  
Irina Radulescu
Keyword(s):  
Degradation Process ◽  
Oil Degradation ◽  
Hydraulic Oil ◽  
Gear Pumps

scholarly journals Synergistic Effects of Multiple Environmental Factors on Degradation of Hydrogenated Nitrile Rubber Seals

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 897 ◽  
Author(s):  
Weitao Lou ◽  
Weifang Zhang ◽  
Tingzhu Jin ◽  
Xuerong Liu ◽  
Wei Dai
Keyword(s):  
Environmental Factors ◽  
Elevated Temperatures ◽  
Synergistic Effects ◽  
Degradation Process ◽  
Nitrile Rubber ◽  
Oxidation Products ◽  
Compression Stress ◽  
Hydraulic Systems ◽  
Hydraulic Oil ◽  
Higher Temperature

Degradation tests of hydrogenated nitrile rubber seals, often used as sealing components in hydraulic systems, were conducted under the free and compression state in air and hydraulic oil at three elevated temperatures for several days to investigate the synergistic effects among three factors. The crosslinking and chain scission reactions both occurred simultaneously at higher temperature during the degradation process, and crosslinking predominated for most cases. Additionally, the synergistic effect between compression stress and hydraulic oil further slowed the degradation rate by limiting oxygen access. However, the higher temperature and hydraulic oil both promoted the formation of oxidation products, whereas the compression stress restrained the formation of amide groups. The fracture morphology results show that the defects gradually formed on the fracture surface, especially for the uncompressed specimens. The increase of the compression set aged in air was more than that in hydraulic oil, implying the more serious degradation. Moreover, rubber seals under the synthetic effect of three environmental factors presented the minimum degradation level. The degradation of the compressed and uncompressed specimens exposed to hydraulic oil is more serious than that of specimens exposed to air.

COMPLEX STAND FOR TESTING OF A GEAR PUMPS AND INVESTIGATION OF THE INFLUENCE OF THE HYDRAULIC OIL TEMPERATURE ON THE PUMP CHARACTERISTICS

2019 ◽  
pp. 287-294 ◽  
Author(s):  
Petko Tsankov ◽  
Ivan Binev ◽  
Nikola Marazov
Keyword(s):  
Experimental Study ◽  
Engine Speed ◽  
Test Bench ◽  
Analytical Dependence ◽  
Gear Pump ◽  
Fluid Temperature ◽  
Hydraulic Oil ◽  
Gear Pumps ◽  
Temperature And Pressure ◽  
The Creation

The work is devoted to the creation of a test bench for a gear pump with options for adjusting the parameters: operating fluid temperature, engine speed, pump load. An experimental study of the effect of hydraulic oil temperature on the characteristics of a gear pump has been made. An analytical dependence is proposed to determine the characteristic of a gear pump with regard to the temperature and pressure of the hydraulic oil.

scholarly journals Interactions of Bio-macromolecules During Processing of Instant Asian Noodles: A Review

2016 ◽  
Vol 9 ◽  
pp. 1-10 ◽  
Author(s):  
Pratiksha Shrestha ◽  
Krishna Prasad Rai ◽  
Anil Kumar Anal
Keyword(s):  
Amylose Content ◽  
Degradation Process ◽  
Oil Degradation ◽  
Uptake Ratio ◽  
Oil Uptake ◽  
High Moisture ◽  
Frying Time ◽  
Physiochemical Properties ◽  
Browning Reaction ◽  
Instant Noodles

The review focuses on how the protein, fats, carbohydrates and water interact and form the complexes during different stages of processing of instant noodles. Moisture is needed for dough formation and chemical interactions therein. Appropriate moisture content is required for proper gelatinization of noodle strand during steaming and eventually moisture is evaporatedoff by drying and frying to increase its shelf life. Frying oil may undergo degradation process invited by high frying time and temperature, high moisture in oil and polyvalent metals. Various intermediate products like dimers and polymers accelerate the oil degradation finally changing the physiochemical properties of oil rendering it unacceptable for processing. Gliadinand glutenin gives noodle its viscoelastic character. The polymeric glutenin network develops throughout the process of mixing, resting and subsequent stages of sheeting. Protein content and amylose content in noodle are inversely proportional to the oil uptake ratio. Another possibility is the non-enzymatic browning reaction during frying of instant noodles.

scholarly journals Ageing Process of Hydraulic Oil in Single-Bucket Excavators in Rock Mining

2019 ◽  
Vol 2 (1) ◽  
pp. 130-139
Author(s):  
Krzysztof Władzielczyk ◽  
Piotr Kipczak
Keyword(s):  
Raw Materials ◽  
Degradation Process ◽  
Raw Material ◽  
Oil Degradation ◽  
Hydraulic Systems ◽  
Ageing Processes ◽  
Hydraulic Hammer ◽  
Actual Use ◽  
Rock Mining ◽  
Working Parameters

Abstract The paper presents the problem of ageing processes of hydraulic oils when used in single-bucket excavators in mining of rock raw materials. Working parameters of these excavators are specific, particularly when a hydraulic hammer is mounted in place of the working bucket, therefore the course of the oil degradation process and the change times should be precisely determined as full functionality of hydraulic systems of excavators must be maintained and the wear of individual components of these systems should be reduced. Research on oil ageing processes has been carried out for excavators from various manufacturers that have operated in mines of rock raw materials of various raw material extraction quantities. The methodology adopted for testing the ageing processes of oils in excavators allowed to obtain a number of results that question the hitherto applied criteria for quality assessment of used oils in relation to the time of their actual use in hydraulic systems of excavators, as well as the time of change of such oils.

scholarly journals Optimization modeling of degradation processes in crude oil spilled on the sea surface considering the wind conditions

2020 ◽  
Vol 4 (2) ◽  
pp. 150-153
Author(s):  
Hikmat G. Asadov ◽  
◽  
R. S. Mammadli ◽  
Keyword(s):  
Wind Speed ◽  
Crude Oil ◽  
Time Dependence ◽  
Optimization Model ◽  
Degradation Process ◽  
Sea Surface ◽  
Oil Degradation ◽  
Optimization Modeling ◽  
Degradation Processes ◽  
Model Study

The article describes an optimization model study of degradation processes in crude oil spilled on the sea surface considering the wind conditions. A new configuration of a simplified optimization model of the oil degradation process on the sea surface is proposed. Based on the proposed configuration, a simplified optimization model of oil degradation on the sea surface has been developed. The optimal relationship between the time dependence of the wind speed and the fractional volume of oil volatilization is established, at which the minimum fractional volume of oil dissolved in water is attained.

Changes in bacterial composition during in vitro oil degradation experiments using activated sludge from different sources

2019 ◽  
Vol 14 (4) ◽  
pp. 931-936
Author(s):  
Yutaka Uyeno ◽  
Akito Matsumoto
Keyword(s):  
Activated Sludge ◽  
Degradation Process ◽  
Synthetic Wastewater ◽  
Rrna Gene ◽  
Oil Degradation ◽  
Operational Taxonomic Units ◽  
Microbial Groups ◽  
Bacterial Groups ◽  
Different Sources

Abstract We monitored bacterial compositional changes during in vitro food oil degradation experiments, wherein activated sludge (AS) from different sources was employed as seed. Two AS samples were collected from different aeration processes at the same plant and one sample was collected from a different plant; these were used for the degradation of synthetic wastewater containing commercial food oil as the sole carbon source. A 16S rRNA gene-based next generation sequencing technique was applied to study the bacterial community in the seed AS samples and resultant water after in vitro degradation for two days. Out of the total assigned genera of 319, 153 were present in all three AS seed samples, while the remaining 166 genera, observed in one or two AS seed samples, accounted for only 5% of the total operational taxonomic units. We found that different bacterial groups of each AS capable of oil degradation were present in the samples after two days' incubation. This suggests that the oil degradation process differently affected the key microbial groups from different sources. Therefore, monitoring of the AS seed and optimizing the degradation condition may be required to achieve efficient degradation performance.

scholarly journals Sludge Formation Analysis in Hydraulic Oil of Load Haul Dumper 811MK V Machine Running at Elevated Temperatures for Bioenergy Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
MohdAhteshamHussain Siddiqui ◽  
Sandeep K Pal ◽  
Nagesh Dewangan ◽  
Somnath Chattopadhyaya ◽  
Shubham Sharma ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Heat Dissipation ◽  
Elevated Temperatures ◽  
Oil Degradation ◽  
Regression Analyses ◽  
Sludge Formation ◽  
Base Oil ◽  
Hydraulic Oil ◽  
Temperature Shear ◽  
Test Result

Hydraulic oil degrades expediently during operating at elevated temperatures, and due to oil degradation, malfunction of all hydraulic components starts that hampers the hydraulic functioning of the machine. An inefficient component of the hydraulic system converts useful energy into heat. Overheating starts when the rate of heat energy escaping from the system overcomes the rate of heat dissipation. Viscosity, total acidic number (TAN), rheology, and FTIR analyses were carried out on the oil samples collected chronically, and the reasons for degradation and sludge formation were evaluated; the results showed that thermal cracking resistance capacity of the oil was low due to the imbalance percentage of additives in the base oil. Sludge impaired the system efficiency and prejudicially creates repercussions on power consumption. Sludge can be recycled for biofuel and to avoid imbalance in the ecosystem. The test result is plotted in a 3D view graph using the MATLAB R 2019 software for a better explanation. Variation in the behaviour of the hydraulic fluid with respect to time, temperature, shear stress, and shear rate was studied, and the result is validated with correlation and regression analyses.

Sign in / Sign up

Export Citation Format

Share Document