scholarly journals The durability test of tractor hydrostatic pump type UD 25 under operating load

2010 ◽  
Vol 56 (No. 3) ◽  
pp. 116-121 ◽  
Author(s):  
Š. Drabant ◽  
J. Kosiba ◽  
J. Jablonický ◽  
J. Tulík
Keyword(s):  
Vegetable Oil ◽  
Test Performance ◽  
Hydraulic Fluid ◽  
Fluid Temperature ◽  
Pressure Loading ◽  
Durability Test ◽  
Cyclic Pressure ◽  
Operating Load ◽  
Transmission Oil ◽  
Environmentally Responsible

The results of the UD 25 hydrostatic pump durability test are presented; they were obtained in the laboratory under operating load. The test of operating load was a continuation of the hydrostatic pump durability test with a cyclic pressure loading according to the norm STN 11 9287. It lasted 300 hours, with 70°C ± 2°C of hydraulic fluid temperature. The aim of the test was to simulate the operation of the hydrostatic pump under load in laboratory and to find out its deterioration and the influence of a biodegradable fluid on its qualities. The achieved results confirmed that flow efficiency of the UD 25 hydrostatic pump decreased only to 3.6% which points to its good technical state even after the test performance. Meanwhile we can state that the used ecological hydraulic fluid on the basis of a vegetable oil "Environmentally responsible tractor transmission oil", produced by the Slovnaft company, Inc., is characterised by very good qualities.

scholarly journals The accelerated laboratory test of biodegradable fluid type “ertto”

2010 ◽  
Vol 56 (No. 1) ◽  
pp. 18-25 ◽  
Author(s):  
Z. Tkáč ◽  
R. Majdan ◽  
Š. Drabant ◽  
J. Jablonický ◽  
R. Abrahám ◽  
...  
Keyword(s):  
Test Results ◽  
Fluid Type ◽  
Pressure Loading ◽  
Test Device ◽  
Operation Conditions ◽  
Limit Value ◽  
Transmission Oil ◽  
Environmentally Responsible ◽  
Short Time

The accelerated laboratory tests can evaluate the properties of new biodegradable fluids under relatively short time. These test results are the ground for the continuity of the tests under operation conditions in machine. The paper presents the test of new biodegradable hydraulic fluid type “Environmentally responsible tractor transmission oil” by designed special test device. The test evaluation was realized by technical state of concrete hydrostatic pump UD 25 which is used in tractors Zetor Forterra. This pump was loaded by cyclic pressure loading during the test with tested fluid. The evaluated parameter was flow efficiency of hydrostatic pump which reached the value 7.3% after the test. The reached value hints a high quality of the tested fluid (the limit value per standard is the flow efficiency decrease – 20%).

scholarly journals Research of Biodegradable Fluid Impacts on Operation of Tractor Hydraulic System

2017 ◽  
Vol 20 (2) ◽  
pp. 42-45 ◽  
Author(s):  
Zdenko Tkáč ◽  
Štefan Čorňák ◽  
Vladimír Cviklovič ◽  
Ján Kosiba ◽  
Josef Glos ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Acid Number ◽  
Hydraulic Fluid ◽  
Spectroscopy Analysis ◽  
Total Acid ◽  
Transmission Systems ◽  
Transmission Oil ◽  
Total Acid Number ◽  
Transmission Fluid ◽  
Agricultural Tractors

Abstract This paper is focused on the impacts of the biodegradable hydraulic and transmission fluid (Universal Tractor Transmission Oil) on operation of tractor hydraulic and transmission systems. The fluid was used in the hydraulic and transmission systems of a Zetor Proxima 6321 tractor. Fluid samples were taken from the Zetor Proxima 6321 tractor at intervals of 250 engine hours. These samples were subjected to an infrared spectroscopy analysis in order to measure the total acid number and perform the ferrography analysis. This paper proves minimal impacts of the biodegradable hydraulic fluid on operation of the Zetor Proxima 6321 tractor. The biodegradable fluid meets the requirements for the operation of agricultural tractors in terms of low impacts on the wear of hydraulic components.

scholarly journals Comparison of Damage to `Tifgreen' Bermudagrass by Petroleum and Vegetable Oil Hydraulic Fluids

1995 ◽  
Vol 5 (1) ◽  
pp. 50-51 ◽  
Author(s):  
M.L. Elliott ◽  
M. Prevatte
Keyword(s):  
Vegetable Oil ◽  
Fluid Volume ◽  
Golf Course ◽  
Hydraulic Fluid ◽  
Negative Effects ◽  
Initial Damage ◽  
Hydraulic Fluids ◽  
Leaf Necrosis ◽  
Turfgrass Quality

Petroleum and vegetable oil hydraulic fluids were spread on `Tifgreen' bermudagrass at three volumes (125, 250, and 500 ml) and three temperatures (27, 49, and 94C) to simulate a turfgrass equipment leak. Initial damage, recovery, and effects for a 1-year period were compared among treatments. All hydraulic fluid treatments resulted in 100% leaf necrosis within 10 days of application. Turfgrass recovery was influenced primarily by the fluid volume. After recovery, only plots treated with petroleum hydraulic fluid were periodically chlorotic, resulting in lower turfgrass quality. Long-term negative effects of hydraulic leaks from golf course equipment may be reduced by using vegetable oil hydraulic fluid.

scholarly journals Simulation Study on the Potential of Braided Hose Failure in Internal Combustion Engines

2018 ◽  
Vol 225 ◽  
pp. 02017 ◽  
Author(s):  
S. Hassan ◽  
S. Afdhal ◽  
M. Shahrizal ◽  
A. Eleena
Keyword(s):  
Stress Distribution ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
The Other ◽  
Combustion Engines ◽  
Analysis Method ◽  
Pressure Loading ◽  
Working Pressure ◽  
Cyclic Pressure ◽  
Causes Of Failure

In this study, damaged braided hoses was obtained from the actual site to investigate the possible causes of failure in the internal combustion engines. The hoses were assembled with polytetrafluroethylene (PTFE) as the inner tube and externally braided outer tube corrosionresistant steel (CRES). The hose had undergone failures near the end of the fittings. The braided hose was measured and modelled using SOLIDWORKS CAD software. The ANSYS static structural stimulation was used to measure the stress distribution on the hose due to pressure applied with various bend shapes. The simulation was done by fixing the end of the pipe and exerting the working pressure inside the inner layer of PTFE. The results of the simulation have shown that the inner tube experienced high stresses near the fittings which is then aggravated with the bending. With cyclic pressure loading, the hose was unable to stand the high stresses near the fittings and therefore failed. Further analyses were done to the braided hose to investigate the other possible of failure using failure analysis method.

Effect of Geometry, Material, and Pressure Variability on Strain and Stress Fields in Dented Pipelines Under Static and Cyclic Pressure Loading Using Probabilistic Analysis

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Husain M. Al-Muslim ◽  
Abul Fazal M. Arif
Keyword(s):  
Probabilistic Analysis ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Deterministic Model ◽  
Mechanical Damage ◽  
Statistical Distribution ◽  
Stress Fields ◽  
Pressure Loading ◽  
Cyclic Pressure ◽  
Pipe Geometry

Mechanical damage in transportation pipelines is a threat to their structural integrity. Failure in oil and gas pipelines is catastrophic as it leads to personal fatalities, injuries, property damage, loss of production, and environmental pollution. Therefore, this issue is of extreme importance to pipeline operators, government and regulatory agencies, and local communities. As mechanical damage can occur during the course of pipeline life due to many reasons, appropriate tools and procedures for assessment of severity is necessary. There are many parameters that affect the severity of the mechanical damage related to the pipe geometry and material properties, the defect geometry and boundary conditions, and the pipe state of strain and stress. The main objective of this paper is to investigate the effect of geometry, material, and pressure variability on strain and stress fields in dented pipelines under static and cyclic pressure loading using probabilistic analysis. Most of the published literature focuses on the strain at the maximum depth for evaluation, which is not always sufficient to evaluate the severity of a certain case. The validation and calibration of the base deterministic model was based on full-instrumented full-scale tests conducted by Pipeline Research Council International as part of their active program to fully characterize mechanical damage. A total of 100 cases randomly generated using Monte Carlo simulation are analyzed in the probabilistic model. The statistical distribution of output parameters and correlation between output and input variables is presented. Moreover, regression analysis is conducted to derive mathematical formulas of the output variables in terms of practically measured variables. The results can be used directly into strain based assessment. Moreover, they can be coupled with fracture mechanics to assess cracks for which the state of stress must be known in the location of crack tip, not necessarily found in the dent peak. Furthermore, probabilities derived from the statistical distribution can be used in risk assessment.

Effect of Geometry, Material and Pressure Variability on Strain and Stress Fields in Dented Pipelines Under Static and Cyclic Pressure Loading Using Probability Analysis

2010 ◽  
Author(s):  
Husain Mohammed Al-Muslim ◽  
Abul Fazal M. Arif
Keyword(s):  
Structural Integrity ◽  
Oil And Gas ◽  
Deterministic Model ◽  
Mechanical Damage ◽  
Statistical Distribution ◽  
Stress Fields ◽  
Pressure Loading ◽  
Cyclic Pressure ◽  
Mathematical Formulas ◽  
Pipe Geometry

Mechanical damage in transportation pipelines is a threat to its structural integrity. Failure in oil and gas pipelines is catastrophic as it leads to personal fatalities, injuries, property damage, loss of production and environmental pollution. Therefore, this issue is of extreme importance to Pipeline Operators, Government and Regulatory Agencies, and local Communities. As mechanical damage can occur during the course of pipeline life due to many reasons, appropriate tools and procedures for assessment of severity is necessary. There are many parameters that affect the severity of the mechanical damage related to the pipe geometry and material properties, the defect geometry and boundary conditions, and the pipe state of strain and stress. The main objective of this paper is to investigate the effect of geometry, material and pressure variability on strain and stress fields in dented pipelines under static and cyclic pressure loading using probabilistic analysis. Most of the published literate focuses on the strain at the maximum depth for evaluation which is not always sufficient to evaluate the severity of a certain case. The validation and calibration of the base deterministic model was based on full-instrumented full-scale tests conducted by Pipeline Research Council International as part of their active program to fully characterize mechanical damage. A total of 100 cases randomly generated using Monte Carlo simulations are analyzed in the probabilistic model. The statistical distribution of output parameters and correlation between output and input variables is presented. Moreover, regression analysis is conducted to derive mathematical formulas of the output variables in terms of practically measured variables. The results can be used directly into strain based design approach. Moreover, they can be coupled with fracture mechanics to assess cracks, for which the state of stress must be known in the location of crack tip, not necessarily found in the dent peak. Furthermore, probabilities derived from the statistical distribution can be used in risk assessment.

scholarly journals Laboratory tests of the hydraulic pump operating load with monitoring of changes in the physical properties

2021 ◽  
Vol 54 (3-4) ◽  
pp. 243-251
Author(s):  
Lubomir Hujo ◽  
Jozef Nosian ◽  
Marcin Zastempowski ◽  
Jan Kosiba ◽  
Jerzy Kaszkowiak ◽  
...  
Keyword(s):  
Physical Properties ◽  
Present Article ◽  
Water Concentration ◽  
Hydraulic Fluid ◽  
Efficiency Change ◽  
Hydraulic Pump ◽  
Laboratory Conditions ◽  
A Value ◽  
Operating Load ◽  
Agricultural Tractors

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 at intervals of 250 and 500 h. The results of the present article include the evaluation of the physical properties of the fluid and the flow efficiency change of the hydraulic pump after 250 and 500 h of operation, while simulating the operation load. Based on a laboratory test, we found that after working for 500 h, the dynamic viscosity of the examined hydraulic fluid at 40°C decreased by 2.92 mPa.s and at 100°C decreased by 0.64 mPa.s. When determining the kinematic viscosity of the hydraulic fluid after working for 500 h, we recorded its decrease, namely, at a temperature of 40°C by a value of 3.37 mm2/s and at a temperature of 100°C, its value decreased by 0.77 mm2/s. In the analysis of the test oil samples, we found that the level of water contamination of the hydraulic fluid decreases with increasing number of hours worked. Specifically, the water concentration in the hydraulic fluid decreased by 0.031%. At the same time, we recorded a slight decrease in the flow efficiency of the hydraulic pump, specifically by a value of 0.03% after 500 h worked. After working 500 h, we found that the range of abrasion particles in the transmission-hydraulic fluid is within the prescribed range, which is determined by the standard D6595-00.

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