scholarly journals The change in the efficiency factor of the pumping unit with a frequency converter

2019 ◽  
Vol 97 ◽  
pp. 05010 ◽  
Author(s):  
Eduard Kan ◽  
Nazir Ikramov ◽  
Muradulla Mukhammadiev
Keyword(s):  
Economic Efficiency ◽  
Water Pressure ◽  
Frequency Converter ◽  
Pump Efficiency ◽  
Test Bed ◽  
Speed Up ◽  
Pump Shaft ◽  
Pumping Unit ◽  
Parameter Measuring ◽  
Pumping Units

This paper gives the results of the investigation of the operation of a pumping unit equipped with a frequency converter. As a rule, it is widely assumed that when changing the speed up to 50 %, the pump efficiency almost does not change, and the possibility of decrease of its efficiency is not taken into consideration when calculating the economic efficiency of the operation of the pumping unit equipped with a frequency converter. However, failure to take account the efficiency decrease may cause inaccurate assessment of the economic efficiency of the use of the frequency converter and, consequently, improper selection of the method of control of the operation of the pumping units. This is particularly important for irrigation pumping plants the operation of which is characterized by large volume of the pumpable volume and less severe requirements for provision of the water pressure required for the consumer. The purpose of this paper is to carry out experiments on a test-bed equipped with a pumping unit, parameter measuring instrument, and a frequency converter, and detection of the pattern of efficiency variation with speed. The paper presents the results of the carried out experiments, the obtained characteristic curves of the variation of different types of the efficiency at variation of the pump shaft speed, as well as their analysis.

scholarly journals Wear issues of pumping units

2021 ◽  
Vol 264 ◽  
pp. 04081
Author(s):  
Oybek Ishnazarov ◽  
Abdusaid Isakov ◽  
Utkir Islomov ◽  
Umirzoq Xoliyorov ◽  
Dilshod Ochilov
Keyword(s):  
Mathematical Model ◽  
Wear Resistance ◽  
Service Life ◽  
Rotation Speed ◽  
Operating Mode ◽  
Factors Influencing ◽  
Pump Shaft ◽  
Pumping Unit ◽  
Pumping Units ◽  
The Mathematical Model

The article presents the possibility of increasing the service life of pumping units. Particular attention is paid to the regulation of the speed of rotation of the pumping unit. There are some assumptions in the mathematical model that do not affect the final result. The factors influencing the operating mode are given. It is indicated that the speed of rotation of the pump shaft significantly affects the wear resistance of the pump blades. Thus, the regulation of the pump rotation speed will rationally increase its service life.

ANALYSIS OF THE OPERATION OF PUMPING UNIT UNDER A RANGE OF DIFFERENT LOADS

2019 ◽  
pp. 263-267
Author(s):  
Antoaneta Dimitrova
Keyword(s):  
Electric Motor ◽  
Energy Efficient ◽  
Frequency Converter ◽  
Hot Water ◽  
Maximum Efficiency ◽  
Pump Unit ◽  
Start Up ◽  
Different Types ◽  
Pumping Unit ◽  
Pumping Units

The report analyzes the work of a pumping unit from the hot water installation of the Faculty of Technics and Technologies - Yambol, Bulgaria, under different load conditions. Simulation stands have been adapted that are suitable for analyzing the performance of motors of different types and depending on how they are put into the pump unit. It was found that when the energy inefficient electric motor is directly started, the maximum efficiency is 79,63% and is achieved at 100% of its load. When using a frequency converter, at 100% of its load, the efficiency is 86,83%. The proposed energy-efficient electric motor, with direct start-up, has the highest efficiency of 86,7%. The obtained results can be used in the modernization of the hot water installation of the Faculty of technics and Technologies - Yambol, in the part “pumping units”.

scholarly journals Development of a stand for researching electric drives of pumping units

Vestnik MGTU ◽  
2020 ◽  
Vol 23 (4) ◽  
pp. 364-375
Author(s):  
A. N. Tsvetkov ◽  
V. Yu. Kornilov ◽  
A. R. Safin ◽  
N. E. Kuvshinov ◽  
T. I. Petrov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Motor ◽  
Frequency Converter ◽  
Electric Motors ◽  
Electric Drives ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Units ◽  
Efficiency And Reliability ◽  
Asynchronous Electric Motor

In the modern oil industry, the vast majority of oil production units are represented by sucker rod pumping units, driven mainly by asynchronous electric motors without using any monitoring, control and regulation means. Studies carried out on such installations show their low energy efficiency and reliability. Therefore, the issue of developing complex electric drives of a new generation based on the use of synchronous valve electric motors is relevant allowing to significantly increase the energy efficiency and reliability of both individual installations and to ensure the creation of "smart" oil field control systems. The paper discusses new technical solutions of the experimental stand which makes it possible to study the energy characteristics of electric drives based on asynchronous and synchronous valve electric motors, as well as allowing to create conditions as close as possible to real field conditions with imitation of the operation of an oil pumping unit of a sucker rod pumping unit. In modern test equipment systems, devices are often used to create a mechanical load on the shaft of the electric motor under study. The system proposed and implemented as such a device is "a frequency converter - load asynchronous electric motor", which has been tested on a stand and has proven to be the best in comparison with traditional circuits using DC motors. But using of a load asynchronous electric motor as part of the test stand has revealed a number of disadvantages: overheating of the electric motor operating in the opposing mode, low accuracy of creating the load torque and the speed of the system's response. The problem of overheating of the load electric motor has been solved by transferring the frequency converter to the direct torque control mode, while a significant decrease in the motor current and stabilization of the temperature regime have been detected. The low accuracy and response speed of the system have been increased by introducing feedback and a PID controller into the stand control system.

scholarly journals Study on custom centrifugal pump performance in supplying food based high viscos liquid

2021 ◽  
Vol 5 (1) ◽  
pp. 80-88
Author(s):  
Nur Hanna Khairul Anuar ◽  
Mohd Nizar Mhd Razali ◽  
Mohamad Rusydi Mohamad Yasin ◽  
Musfirah Abdul Hadi ◽  
Abdul Nasir Abd. Ghaffar
Keyword(s):  
Centrifugal Pump ◽  
Variable Frequency ◽  
Pump Efficiency ◽  
Shaft Speed ◽  
Variable Frequency Drive ◽  
Viscous Liquids ◽  
Pump Performance ◽  
Dynamic Head ◽  
Shaft Power ◽  
Pump Shaft

Viscosity is one of the factors affecting the performance of the centrifugal pump. A centrifugal pump is a device that used driven motor called impeller to move fluid by rotational energy. This thesis is about the analysis of the performance of the centrifugal pump when transferring viscous liquids. For this project, the objective is to design and fabricate a device that can pump liquid with various viscosity using centrifugal pump. The liquids used in the experiment are comprised of a mixture of detergent and water with different ratio to alter the viscosity. The viscosity is being identified by the usage of Zahn Cup Method with the temperature kept constant at 26 °C throughout the experiment. The performance of the centrifugal pump is being investigated by four parameters which is the flowrate, Total Dynamic Head (TDH), power and efficiency. The performance of the centrifugal pump can be accessed by altering the pump shaft speed in order to get various reading for the flow rate. In order to alter the pump shaft speed, the usage of motor with Variable Frequency Drive (VFD) is implemented. The values for the flowrate and pump shaft power are measured by flowmeter and Variable Frequency Drive (VFD). The Total Dynamic Head (TDH), hydraulic power and pump efficiency is calculated based on the reading of the flowmeter and pump shaft power displayed at Variable Frequency Drive (VFD). At the end of this project, the pump performance while pumping different viscous liquids at different flowrates is being identified.

scholarly journals Improving the Efficiency of Gas Pumping Units: Problems and Solutions

2019 ◽  
pp. 104-118
Author(s):  
E.M. Komarov ◽  
Zh.M. Kokueva
Keyword(s):  
Gas Turbine ◽  
Problems And Solutions ◽  
Pumping Unit ◽  
Gas Pumping ◽  
Gas Pumping Unit ◽  
Pumping Units ◽  
Turbine Drive

The paper describes the process of initiating a project to improve the efficiency of gas turbine plants for driving centrifugal superchargers at compressor stations. The study shows the main trends of increasing the efficiency of gas turbine drives of gas pumping units, gives the constructive-functional appearance of the modern gas turbine drive of the gas pumping unit, and proposes a method for increasing its efficiency.

scholarly journals In situ measurements of till deformation and water pressure

2006 ◽  
Vol 52 (177) ◽  
pp. 175-182 ◽  
Author(s):  
Martin Truffer ◽  
William D. Harrison
Keyword(s):  
Pore Water ◽  
Pressure Transducer ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Spatial Homogeneity ◽  
Early Season ◽  
Surface Motion ◽  
Speed Up ◽  
Tilt Sensor

AbstractA newly developed hammer was used to insert two autonomous probes 0.8 m and 2.1 m into clast-rich subglacial till under Black Rapids Glacier, Alaska, USA. Both probes were instrumented with a dual-axis tilt sensor and a pore-water pressure transducer. The data are compared to a 75 day record of surface velocities. Till deformation at depth was found to be highly seasonal: it is significant during an early-season speed-up event, but during long periods thereafter measured till deformation rates are negligible. Both tilt records show rotation around the probe axis, which indicates a change in tilt direction of about 30°. The tilt records are very similar, suggesting spatial homogeneity on the scale of the probe separation (4 m horizontal and 3.3 m vertical). There is evidence that during much of the year sliding of ice over till or deformation of a thin till layer (<20 cm) accounts for at least two-thirds of total basal motion. Basal motion accounts for 50–70% of the total surface motion. The inferred amount of ice–till sliding is larger than that found at the same location in a previous study, when surface velocities were about 10% lower. We suggest that variations in ice–till coupling account for the observed variations in mean annual speed.

scholarly journals Crack Detectability in Vertical Axis Cooling Pumps During Operation

2004 ◽  
Vol 10 (2) ◽  
pp. 121-133 ◽  
Author(s):  
N. Bachschmid ◽  
P. Pennacchi ◽  
E. Tanzi ◽  
P. Verrier ◽  
F. Hasnaoui ◽  
...  
Keyword(s):  
Cold Water ◽  
Water Pressure ◽  
Vertical Axis ◽  
Cyclic Stress ◽  
Hot Water ◽  
Rotating Shaft ◽  
Machine Condition Monitoring ◽  
Pump Shaft ◽  
Condition Monitoring System ◽  
Thermal Striping

The problem which is faced in this article is the analysis of the effects of a transverse propagating crack on the vibrational behavior of a vertical axis cooling pump. The crack is assumed to develop in a section between the impeller and a seal, preventing the hot water to flow upwards along the rotor shaft. The pressurized seal is fed with an injection of cold water, and crack initiation may be due to a thermal striping phenomenon. Afterwards, crack growth could be driven by a combination of thermal and mechanical loads, causing alternate cyclic stress in the shaft. Cracking instances of this type have been reported worldwide in several machines of similar design. In this article, the fact is emphasized that the crack behavior is likely to be influenced by the thermal field and by the water pressure in the cracked area. A dynamical lineshaft model, integrated by an original representation of the crack, has been developed to investigate the possible vibratory symptoms related to a crack propagation. The vibrations are generally measured in correspondence of a rigid coupling which connects the motor shaft to the pump shaft, in a position which is rather far away from the crack. 1 × rev., 2 × rev., and 3 × rev. vibration components, which are generally displayed by the machine condition monitoring system and are the most significative symptoms of the presence of a transverse crack in a rotating shaft, are calculated.

The Application Research of Virtual Prototyping Technology in the Design of Oil Field Pumping Units

2008 ◽  
Vol 392-394 ◽  
pp. 464-470
Author(s):  
Wen Lei Sun ◽  
X. Wang ◽  
J.Z. Hai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Virtual Prototyping ◽  
Oil Field ◽  
Dynamics Analysis ◽  
Analysis Software ◽  
Element Analysis ◽  
Virtual Prototyping Technology ◽  
Pumping Unit ◽  
Pumping Units

Regulating diameter-variable moment pumping unit as the research object. which been analysed by virtual prototyping technology, by this way, the application ways and realization means of virtual prototyping technology is explored in this field.The virtual prototyping technology is introduced into the dynamic characteristics analysis and optimization for pumping units, and the 3D CAD software, multibody system dynamics analysis software and finite element analysis software were combined. The digital physical prototype for pumping units is established by UG software; ADAMS was Used to establish the function virtual prototype and virtual test system, to develop the test analysis and optimize its structure parameters according to the movement requirements for pumping units; The finite element analysis of the pumping unit parts is processed in the ANSYS environment, and structural design is optimized in accordance with the stress distribution characteristics of pumping components. In this paper, CAD and CAE technology are used with close combination, the pumping units dynamics analysis and simulation is developed from the systemic perspective. The research has the characteristics of high precision analysis, wide range of applications and good practical value.

Design and analysis for a new energy-saving hydraulic pumping unit

2017 ◽  
Vol 232 (12) ◽  
pp. 2119-2131 ◽  
Author(s):  
Zhenhe Li ◽  
Jinchun Song ◽  
Yanjun Huang ◽  
Yungong Li ◽  
Jianwen Chen
Keyword(s):  
Energy Saving ◽  
Structural Design ◽  
System Parameters ◽  
Load Sensing ◽  
Operating Rate ◽  
New Energy ◽  
Pumping Unit ◽  
Pumping Units ◽  
Double Wells ◽  
Working Efficiency

With the increasing concern over global energy crisis, energy saving in pumping units is becoming a significant subject. In terms of energy-saving and working efficiency, hydraulic pumping units outperform conventional pumping units. In this paper, a novel hydraulic pumping unit is proposed to overcome the existing drawbacks of conventional pumping units and present hydraulic pumping units. Firstly, this novel hydraulic pumping unit adopts a balanced mechanical structure, which means two oil wells are used in this system and the weight of their sucker rods can balance each other through the symmetrical arrangement. This kind of structural design not only saves the nominal power but also allows the system to continuously pump oil. Another feature of this hydraulic pumping unit is that it adopts the electro-hydraulic proportional load-sensing control technology, which makes the pressure and flow rate of the pump adapt to the requirement automatically in real time. The double wells of the system work alternatively under the normal condition and any one can work alone when the other needs maintenance, which improves the operating rate of pumping oil. After the main system parameters are calculated, conclusion can be drawn that both the nominal and operating power of this hydraulic pumping unit are relatively low. The model of the whole system is built based on mathematical dynamics and AMESim environment, and simulation results demonstrate that the proposed hydraulic pumping unit can achieve remarkable energy-saving performance.

scholarly journals A double continuum hydrological model for glacier applications

2014 ◽  
Vol 8 (1) ◽  
pp. 137-153 ◽  
Author(s):  
B. de Fleurian ◽  
O. Gagliardini ◽  
T. Zwinger ◽  
G. Durand ◽  
E. Le Meur ◽  
...  
Keyword(s):  
Hydrological Model ◽  
Water Pressure ◽  
Computational Cost ◽  
Ice Streams ◽  
Ice Dynamics ◽  
Ice Flow ◽  
Wide Range ◽  
Hydrological System ◽  
Speed Up ◽  
Model Components

Abstract. The flow of glaciers and ice streams is strongly influenced by the presence of water at the interface between ice and bed. In this paper, a hydrological model evaluating the subglacial water pressure is developed with the final aim of estimating the sliding velocities of glaciers. The global model fully couples the subglacial hydrology and the ice dynamics through a water-dependent friction law. The hydrological part of the model follows a double continuum approach which relies on the use of porous layers to compute water heads in inefficient and efficient drainage systems. This method has the advantage of a relatively low computational cost that would allow its application to large ice bodies such as Greenland or Antarctica ice streams. The hydrological model has been implemented in the finite element code Elmer/Ice, which simultaneously computes the ice flow. Herein, we present an application to the Haut Glacier d'Arolla for which we have a large number of observations, making it well suited to the purpose of validating both the hydrology and ice flow model components. The selection of hydrological, under-determined parameters from a wide range of values is guided by comparison of the model results with available glacier observations. Once this selection has been performed, the coupling between subglacial hydrology and ice dynamics is undertaken throughout a melt season. Results indicate that this new modelling approach for subglacial hydrology is able to reproduce the broad temporal and spatial patterns of the observed subglacial hydrological system. Furthermore, the coupling with the ice dynamics shows good agreement with the observed spring speed-up.

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