Determination of fluid leakage and compressibility factor in the hydraulic systems of production equipment

The actual problem of the possibility of using the equations of state for the gas phase of natural gas at temperatures below 250 K is considered. To solve it, the compressibility coefficients of natural gas obtained experimentally with high accuracy are required. The technique was developed and experimental study was carried out of compressibility factor aiming expanding temperature range of the state equations GERG-2004 and AGA8-DC92. The proposed technique is based on the fact that to assess the applicability of the equation of state, it is sufficient to obtain the relative value of the compressibility coefficient and not to determine its absolute value. The technique does not require complex equipment and provides high accuracy. The technique was tested on nitrogen, argon, air and methane. Uncertainty of determination of the compressibility factor is not greater than 0.1 %. For two different compositions of natural gas, obtained experimental data were demonstrated that the equations of state GERG-2004 and AGA8-92DC provide uncertainty of the calculation of the compressibility coefficient within 0.1 % in the temperature range from 220 K to 250 K and pressure below 5 MPa.

Download Full-text

Determination of cerebrospinal fluid leakage by selective deletion of transferrin glycoform using an immunochromatographic assay

Theranostics ◽

10.7150/thno.34411 ◽

2019 ◽

Vol 9 (14) ◽

pp. 4182-4191 ◽

Cited By ~ 1

Author(s):

Jusung Oh ◽

Seok-Joon Kwon ◽

Jonathan S. Dordick ◽

William J. Sonstein ◽

Robert J. Linhardt ◽

...

Keyword(s):

Cerebrospinal Fluid ◽

Immunochromatographic Assay ◽

Cerebrospinal Fluid Leakage ◽

Fluid Leakage

Download Full-text

UNSTEADY HYDRODYNAMIC PROCESSES IN THE SLIT GAPS NONCONTACT SEALS IN A STEP CHANGE IN PRESSURE

URBAN CONSTRUCTION AND ARCHITECTURE ◽

10.17673/vestnik.2015.01.15 ◽

2015 ◽

Vol 5 (1) ◽

pp. 100-106

Author(s):

Evgeny A. KRESTIN

Keyword(s):

Channel Wall ◽

Weighting Function ◽

Viscous Friction ◽

Step Change ◽

Stationary Processes ◽

Hydraulic Systems ◽

Dynamic Studies ◽

Unit Step ◽

Hydrodynamic Processes

Determination of leakage of fluid through the slotted annular gaps in dynamic studies leads to the discrepancy between the theoretical and experimental results. This discrepancy is particularly large for non-stationary processes in hydraulic systems. Dynamic characteristics of annular sealing cracks in a typical non-contact seals in stepwise (unit step) change of pressure are found. The velocity profile, the flow of leaks, the force of viscous friction on the channel wall are determined, the relaxation during the defined transition and the weighting function of the sealing gap are viewed.

Download Full-text

A New Method for Determination of the Pre-Form Shapes and Their Corresponding Pressures in Tube-Hydroforming Process of SUS 304 in a Square Die

ASME 2011 International Manufacturing Science and Engineering Conference, Volume 1 ◽

10.1115/msec2011-50153 ◽

2011 ◽

Author(s):

S. A. Tabatabaei ◽

M. Shariat Panahi ◽

S. M. Tabatabaei ◽

M. Mosavi Mashhadi

Keyword(s):

Neural Network ◽

Tube Hydroforming ◽

Production Equipment ◽

Geometrical Shape ◽

Hydroforming Process ◽

Form Design ◽

Trained Neural Network ◽

Minimum Work ◽

Tool Cost

The pre-form design in hydroforming process plays a key role in improving product quality, such as defect-free property and proper final product. This approach, however, leads not only to the increase of significant tool cost but also to the extended down-time of the production equipment. It is thus necessary to reduce time and man power through an effective method of pre-form design. In this paper, the equi-potential lines designed in the electric field are introduced to find an appropriate pre-form shape. The equi-potential lines generated between two conductors of different voltages show similar trends for minimum work paths between the undeformed shape and the deformed shape. Based on this similarity, the equi-potential lines obtained by arrangement of the initial and final shapes are utilized for the design of the pre-form, and then the finite element simulations are done for finding the forming pressure of each pre-form shape. Finally, the pre-form and its corresponding forming pressure with other parameters are used for training an artificial neural network. This trained neural network can be used for estimating the proper pre-form shape and forming pressure for a SUS304 tube inside an square die or other configurations of die (Geometrical shape) and tube (Diameter and thickness).

Download Full-text

Investigation of hydraulic fitting losses

MATEC Web of Conferences ◽

10.1051/matecconf/201816802011 ◽

2018 ◽

Vol 168 ◽

pp. 02011 ◽

Cited By ~ 1

Author(s):

Marian Bojko ◽

Milada Kozubková

Keyword(s):

Flow Direction ◽

Experimental Methods ◽

Numerical Approach ◽

Model Verification ◽

Hydraulic Systems ◽

Mathematical Methods ◽

Standards And Regulations ◽

Definition Of ◽

Resistance Coefficients

Fluid flow in hydraulic systems, fittings, and piping causes hydraulic losses due to the change of flow direction and friction in the fluid. The main consequence of the resulting losses is the increase in the overall pressure gradient of the circuit. The paper is focused on the investigation of valve losses and the determination of resistance coefficients, the definition of which depends on the valve type. Methods of determination are of two types, i.e. experimental methods and mathematical methods. In the case of experimental methods, the procedures prescribed by the standards and regulations must be respected. Mathematical methods are related to defining an appropriate mathematical model and numerical approach. Both methods are applied to the ball valve and model verification is performed at the same time. The output of the thesis is the methodology for determination of resistance coefficients of valves with other diameters and other flowing media based on verified mathematical modeling.

Download Full-text

DESEMPENHO DE UM LISÍMETRO DE PESAGEM HIDRÁULICA COM DIFERENTES SISTEMAS DE LEITURA

Irriga ◽

10.15809/irriga.2016v1n01p232-245 ◽

2018 ◽

Vol 1 (01) ◽

pp. 232 ◽

Cited By ~ 1

Author(s):

Antonio Henrique Cardoso do Nascimento ◽

Suzana Maria Gico Lima Montenegro ◽

Joao Audifax Cézar de Albuquerque Filho ◽

Ênio Farias de França e Silva ◽

NADIELAN DA SILVA LIMA

Keyword(s):

Measurement Errors ◽

Reference Method ◽

Automated System ◽

Coefficient Of Determination ◽

Hydraulic Systems ◽

Para Determinar ◽

Reading System ◽

E Mail ◽

Weighing Lysimeter

DESEMPENHO DE UM LISÍMETRO DE PESAGEM HIDRÁULICA COM DIFERENTES SISTEMAS DE LEITURA ANTÔNIO HENRIQUE CARDOSO DO NASCIMENTO1; SUZANA MARIA GICO LIMA MONTENEGRO2; JOÃO AUDIFAX CÉSAR DE ALBUQUERQUE FILHO3; ÊNIO FARIAS DE FRANÇA E SILVA3 E NADIELAN DA SILVA LIMA3 1Unidade Acadêmica de Serra Talhada – UAST. Avenida Gregório Ferraz Nogueira, S/N Bairro: José Tomé de Souza Ramos CEP: 56909-535 - Serra Talhada / PE. E-mail: [email protected] de Engenharia Civil/UFPE, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária. CEP 50.740-530. Recife, PE. Fone: (81) 2126 7216. E-mail: [email protected] de Engenharia Agrícola/UFRPE. R. Dom Manoel de Medeiros, s/n, Dois Irmãos, CEP 52.171-900, Recife, PE. Fone: (81) 3320-6264. E-mails: [email protected]; [email protected]; [email protected] 1 RESUMO A lisimetria de pesagem é reconhecidamente a melhor técnica para determinar a evapotranspiração das culturas, sendo adotada como metodologia padrão para servir de referência na avaliação de outros métodos e para calibrar modelos de estimativa da evapotranspiração em diferentes culturas. Neste sentido, objetivou-se com o trabalho analisar o desempenho de lisímetro de pesagem hidráulica por meio de calibrações ao longo de um ano e através de estimativas de erros de medidas utilizando dois sistemas de pesagem: um sistema automatizado e o outro com sistema de leitura manual. O trabalho foi conduzido em Recife, no campus da Universidade Federal Rural de Pernambuco, no litoral de Pernambuco. A metodologia empregada na instalação e na calibração do lisímetro foi adequada, com coeficiente de determinação de 0,99 na equação de calibração. A relação entre a variação de massa e resposta na voltagem da célula de carga e/ou leitura no manômetro do lisímetro é descrita adequadamente por modelo linear com mínima histerese. O lisímetro de pesagem hidráulica, independente do sistema de leitura, obteve excelente estabilidade, sensibilidade, resolução e exatidão, ao longo de um ano, detectando variações de massa devido à chuva, irrigações e evapotranspiração nos momentos de calibração e durante o ano, mostrando-se adequado para a estimativa de demanda hídrica. Palavras-chave: evapotranspiração de referência, leitura manual, leitura automática. NASCIMENTO, A. H. C; MONTENEGRO, S. M. G. L.; ALBUQUERQUE FILHO, J. A. C.; SILVA, E. F. F.; LIMA, N. S.ANNUAL PERFORMANCE OF A weighing lysimeter HYDRAULIC SYSTEMS WITH DIFFERENT READING 2 ABSTRACT The weighing lysimeter is recognized as the best technique to estimate evapotranspiration of crops, being adopted as standard reference method in the evaluation of other methods and to calibrate models to estimate evapotranspiration from different crops. In this sense, the objective of the present work is to analyze lysimeter performance through calibrations over a year and through estimates of measurement errors using hydraulic weighing lysimeters with two weighing systems: an automated system and another system with manual reading. The work was conducted in Recife, in the Federal Rural University of Pernambuco ( 8°01'05" south latitude, 34°56'48" west longitude, at an altitude of 6,4m).The methodology used in the lysimeter installation and calibration was adequate, resulting in a coefficient of determination of 0.99 in the calibration equation. The relationship between weight change and response to the load voltage and / or reading on the lysimeter cell gauge is adequately described by a linear model with minimal hysteresis. The hydraulic weighing lysimeter, independent of the reading system showed excellent stability, sensitivity , resolution and accuracy over a year having detected variations in mass due to rain, irrigation and evapotranspiration , being suitable for the estimation of water demand. Keywords: reference evapotranspiration, manual reading, automatic reading.

Download Full-text

Hybrid Control Accommodation forWater-asset Management of Hydraulic Systems Subjected to Large Operating Conditions

International Journal of Computers Communications & Control ◽

10.15837/ijccc.2007.3.2357 ◽

2007 ◽

Vol 2 (3) ◽

pp. 241

Author(s):

Eric Duviella ◽

Pascale Chiron ◽

Philippe Charbonnaud

Keyword(s):

Asset Management ◽

Hydraulic System ◽

Hybrid Control ◽

Operating Conditions ◽

Hydraulic Systems ◽

Selection Technique ◽

Operating Modes ◽

Transfer Delay ◽

Simulation Results

The Hybrid Control Accommodation (HCA) strategy was proposed to improve the water-asset management of hydraulic systems by resource allocation and setpoint assignment. Hydraulic system dynamics are taken into account during the setpoint assignment step which consists in controlling gates for large operating conditions. For hydraulic systems subjected to strong disturbances, transfer delays are variable, thus different operating modes must be considered. A multimodelling method, associated to a selection technique of transfer delay, allowing for the determination of the number of models, is proposed. The simulation results on the first reach of the Neste canal show the effectiveness of the HCA strategy.

Download Full-text

Timely diagnostics of hydraulic equipment in metallurgical production

Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY) ◽

10.21122/1683-6065-2021-3-50-54 ◽

2021 ◽

pp. 50-54

Author(s):

E. V. Gapeenko

Keyword(s):

Distinctive Feature ◽

Continuous Monitoring ◽

Production Equipment ◽

Diagnostic Methods ◽

Hydraulic Systems ◽

Metallurgical Production ◽

Management Company ◽

Hydraulic Equipment ◽

Fast Acting ◽

Combined Mode

Precision control of hydraulic equipment is a distinctive feature of modern hydraulic systems. With the help of special diagnostic devices, it is possible to reliably and simply monitor the operation of hydraulic equipment. Diagnostic methods can be very different. The article lists the stages and methods of checking hydraulic equipment malfunctions, as well as describes the principles of operation of diagnostic devices of well‑known world manufacturers HYDAC, MOOG, used in OJSC “BSW – Management Company of the Holding “BMC”. Schematically, the connection of the MOOG tester to the production equipment is presented when checking the servo valve in autonomous and combined mode, without resorting to dismantling the valve. Continuous monitoring of the oil purity with the help of the HYDAC FCU device allowed saving time on assessing its condition and taking fast‑acting corrective measures to clean the oil from contamination.

Download Full-text

ANALYSIS OF THE STATE OF SERVICEABILITY IN THE PROCESS OF WEAR OF ELEMENTS DURING THE OPERATION OF OIL AND GAS PRODUCTION EQUIPMENT

ETM Equipment, Technologies, Materials ◽

10.36962/etm0804202187 ◽

2021 ◽

Vol 08 (04) ◽

pp. 87-94

Author(s):

Sevda Aliyeva Sevda Aliyeva

Keyword(s):

Oil And Gas ◽

Production Equipment ◽

Gas Production ◽

The State ◽

Structural Elements ◽

Structural Element ◽

Oil And Gas Production ◽

Total Utility ◽

Generalized Indicator

The generalized indicator of useful use, depending on the state of individual elements of oil-producing equipment, characterizes the ability of this equipment to perform its function during operation at optimal working time. The generalized indicator of the useful use of operational equipment can be described as the calculated sum of the indicator of the useful use of individual equipment elements. If, during operation, the oil-producing equipment retains its operability due to frequent replacement of its structural and non-structural elements, then such operational equipment is considered by users as outdated. Operating equipment can be divided into 6 categories according to the indicators of suitability. The article analyzes the state of useful use of equipment and, as a result, the total utility of equipment is calculated in accordance with the indicators of useful use by category, and graphs of changes in the state of useful use are constructed. Based on the study of the graphs of the useful use of equipment, it was proposed to conduct an analysis in the following areas: • Evaluation of the design and technological perfection of the equipment by users according to important new parameters. • Determination of equipment compliance with wear standards during operation. Keywords: structural element, wear theory, the usefulness of jam, categories, schedule of changes, reliability.

Download Full-text