scholarly journals RESEARCH RESULTS OF THE IMPROVED HYDRAULIC JET PUMPING UNIT

2020 ◽  
Vol 6 (444) ◽  
pp. 14-22
Author(s):  
Sh. A. Abdreshov ◽  
◽  
A. E. Aldiyarova ◽  
E. T. Kaypbaev ◽  
◽  
...  
Keyword(s):  
Experimental Model ◽  
Laboratory Tests ◽  
Experimental Studies ◽  
Jet Pump ◽  
Ejection Coefficient ◽  
Jet Pumps ◽  
Useful Flow ◽  
Pumping Unit ◽  
Pumping Units

The scientific article is aimed at substantiating the classification of hydraulic jet pumping units, developing an experimental model of an improved hydraulic jet pumping unit, conducting experimental studies - determining the useful flow Qгн depending on the flow rate of the centrifugal pump used Qн for two variants of the pumping unit operating according to the traditional and alternative technology of water lifting, determination of the head losses hснi and friction coefficients ξснi in jet pumps, increasing the ejection coefficient Ke from the swirl parameter S of water supply to the intake chamber of the jet pump and laboratory tests of the hydraulic jet pumping unit for agricultural water supply and irrigation of pastures. The results of experimental studies and laboratory tests of an experimental model of an improved water-jet pumping unit, developed at NAO KazNAU, are presented. An analysis is given of the results of comparative tests of a hydraulic jet pumping unit for two variants of the technological process: an alternative and a traditional one with an increase in the effective supply of an alternative option by 2-4 times, a decrease in the required pressure by 1.5-2 times and an increase in efficiency by 1.1-2 times. The aim of the study is to obtain results to substantiate the classification of hydraulic jet pumping units, to carry out experimental studies and laboratory tests of an improved hydraulic jet pumping unit operating according to an alternative water lifting technology, which allows to reduce the required head of the pumping unit, increase the useful flow and increase the efficiency of the improved hydraulic jet pumping unit. The work used patent research with a review of works that were carried out according to existing methods: identifying close analogues, analyzing existing works and using them in development. Experimental studies were carried out to study the technological process of water rise from wells, the processes occurring in the used jet pumps - determining the useful flow depending on the flow of a centrifugal pump, determining the pressure losses and friction coefficients in jet pumps, the ejection coefficient and checking the reliability of the theoretical assumptions obtained. Based on the analysis of the work performed and patent research on technologies for lifting water from underground water sources by hydraulic jet pumping units and designs developed for them, a substantiated classification of hydraulic jet pumping units is proposed, which allows, depending on the task at hand, to correctly choose the necessary structural and technological scheme, type of jet pump and its implementation in the development of the required effective standard sizes of the hydraulic jet pumping unit. The scheme of the test bench and the experimental model of the improved hydraulic jet pumping unit with measuring equipment and instruments for conducting experimental research and laboratory tests on a bench well is presented.

Результаты экспериментальных исследований гидравлических ударов, возникающих при работе канализационных насосных станций

2019 ◽  
pp. 55-59
Author(s):  
A. Zhitenev ◽  
I. Kurganov ◽  
V. Ignatchik ◽  
S. Sarkisov ◽  
P. Vinokurov
Keyword(s):  
Experimental Studies ◽  
Water Hammer ◽  
Joint Operation ◽  
Effective Measure ◽  
Pressure Transducers ◽  
Pumping Stations ◽  
Pumping Unit ◽  
Pumping Units ◽  
Location Type ◽  
Practical Recommendations

Представлены результаты исследований гидравлических ударов, возникающих при работе канализационных насосных станций. Исследования проведены на двух однотипных станциях СанктПетербурга. В настоящее время отсутствуют направленные на снижение интенсивности гидравлических ударов на канализационных насосных станциях практические рекомендации, включающие выбор места установки и типа обратных клапанов, сочетание их совместной работы с плавным пуском и т. п. Поэтому в СанктПетербурге проводится комплекс экспериментальных исследований, направленных на решение этой задачи. При проведении исследований применены пьезорезисторные преобразователи давления и модульный регистр сигналов. Применение обратных клапанов с гидротормозом является более эффективной мерой борьбы с гидравлическими ударами по сравнению с плавным пуском и остановкой насосного агрегата. Гидравлические удары, возникающие при пуске насосных агрегатов при работе в сочетании с обратными клапанами без гидротормоза, могут превышать гидравлические удары, возникающие при их остановке.The results of studies of water hammer arising in the operation of sewage pumping stations are presented. The studies were carried out at two stations of the same type in St. Petersburg. At present, there are no practical recommendations aimed at reducing the strength water hammer at sewage pumping stations including the choice of location, type of check valves, a combination of their joint operation with smooth start, etc. Therefore, a set of experimental studies is conducted in St. Petersburg aimed at the solution to this problem. During the research, piezoresistor pressure transducers and a modular signal register were used. The use of check valves with hydraulic brakes is a more effective measure to combat water hammers compared to the smooth start and halt of the pumping unit. Water hammers that occur at the startup of pumping units while operating in combination with check valves without hydraulic brakes can exceed water hammers that occur when they stop.

Estimation of the equality of the beamless sucker-rod oil pumping unit by the value of the consumption current

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (9) ◽  
pp. 571-578
Author(s):  
Beyali Ahmedov ◽  
◽  
Anar Hajiyev ◽  
Vugar Mustafayev ◽  
◽  
...  
Keyword(s):  
Experimental Studies ◽  
Operating Mode ◽  
Mean Time Between Failures ◽  
Constructive Solution ◽  
Sucker Rod ◽  
Key Factor ◽  
Current Article ◽  
Pumping Unit ◽  
The Right ◽  
Pumping Units

The article presents the results of experimental studies to assess the loading and balancing of a new constructive solution of beamless sucker-rod pumping units. It is noted that the key factor that has the most significant effect on the mean time between failures (MTBF) is the right balancing of the pumping unit. The main purpose of the balancing device is the accumulation of potential energy during the downstroke and its release during the upstroke of the rod. It has been proved that the proposed additional balancing system (movable counterweight) which helps to reduce the uneven load on the electric motor and the power consumption of the pumping unit will also increase the efficiency of the beamless sucker-rod pumping unit. It was found that losses in sucker-rod pumps depend on the degree of balance of the counterweights. If the unbalance coefficient of the equipment is in the range from –5 to +5%, then the power loss due to unbalance can be ignored. In the current article, the authors propose a technique that allows to determine the energy characteristics of the electric drive of the pumping unit under conditions of a cyclically changing load and insufficient balance. It was revealed that when the balancer head passes from the upstroke to the downstroke and vice versa, there are sections with a negative value of the torque, which is explained by the influence of the inertial forces of the moving masses. This leads to shocks in the gearing of the reducer at the extreme positions of the cranks, increased wear and possibly to breakage of the teeth. Since it is not possible to completely eliminate this phenomenon, one should strive to limit the value of the negative torque by the correct balancing of the sucker-rod pump. In all cases, the change in the operating mode of a new constructive solution of beamless pumping unit requires new calculations, and requires changing the position and weights of movable and rotary counterweights (with combined balancing).

scholarly journals THE RESEARCH OF PETROLEUM JET PUMP OUTLOOK

2019 ◽  
pp. 41-51
Author(s):  
O. V. Panevnyk
Keyword(s):  
Oil And Gas ◽  
Experimental Studies ◽  
Mutual Orientation ◽  
Jet Pump ◽  
Jet Pumps ◽  
Hydro Jet ◽  
Bottom Hole Assembly ◽  
Optimum Depth ◽  
Solid Works ◽  
Pumping Equipment

The development trends of hydraulic jet pumps used for the oil-fields exploitation are analyzed. The ambitionto optimize the process of mixing flows has led to the emergence of numerous designs of jet pumps, in which swirling flows are used instead of direct flows. The creation of circulation flows in the pump wet end promotes alignment of coaxial flows velocities, intensifies the process of energies exchange in the liquid, and increases the efficiency of the mixing process. The combination of direct and circulation flows gives a possibility to improve the technical characteristics of jet pumps up to 30%. The dimensions and the mutual orientation of the elements of the pump wet end have a decisive influence on the energy efficiency of the ejection technologies implementation. The optimization of dimensions and orientation of the components of the jet pump necessitates multifactorial experimental studies, which, in addition to the design factors, should also take into account the working mode of the ejection system in the well. The task of optimizing the design and mode parameters of a well ejection system can be solved by simulating the work process of the jet pump using modern software complexes Solid Works and ANSYS, which provide the necessary accuracy of the calculation operations. The efficiency of the ejection system also depends on the depth of its location in the well. Determining the optimum depth of installation of the ejection system in the well presupposes the use of iterative calculation methods with the aid of appropriate computer programmes (for example, Matchad). The development of the hydro-jet operation of oil wells is characterized by the tendency of a joint arrangement of the ejection system and traditional types of downhole pumping equipment. In the design of the combined oil-producing system the jet pump creates a low pressure zone in the bottom and intensifies the inflow ofhydrocarbons from the production horizon, while the traditional downhole pump transports them to the surface. The presence of an additional (jet) pump in the well optimizes the conditions of the main pump use. It improves the energy characteristics of the bottom-hole assembly and increases the efficiency of oil production. The analysis of the hybrid ejection technologies application indicates the prospects of this trend of oil and gas equipment. 

Some aspects of improving the energy efficiency of a mine centrifugal pumps.

2020 ◽  
Vol 23 (2) ◽  
pp. 48-51
Author(s):  
V. KONDRATENKO ◽  
◽  
V. KALYNYCHENKO ◽  
Keyword(s):  
Energy Efficiency ◽  
Mine Drainage ◽  
Experimental Studies ◽  
Operating Mode ◽  
Centrifugal Pumps ◽  
Pump Unit ◽  
Drainage Systems ◽  
Start Up ◽  
Discharge Unit ◽  
Pumping Units

Mine drainage systems, which are used at the main drainage of mining enterprises, have a drive capacity of up to 1600kW. To reduce non-productive energy losses, as well as for the continuous operation of the mining company, mine pumps must be energy efficient and reliable. Analysis of downtime of drainage systems shows that the weak point is the unloading device. This fact can lead not only to the failure of the pumping unit, but also to possible prolonged downtime of the mine. The main disadvantage of the existing disk unloading devices of mine pumps is their low reliability and low service life, due to the rapid wear of the components of the unloading unit. The most vulnerable elements of the unloading device are the unloading rings. The need for frequent replacement and adjustment of the elements of the discharge unit is associated with disassembly and assembly of the pump directly in the pump chamber. Such actions require significant costs of unproductive manual labor of service personnel, and rapid wear of parts of the unloading device necessitates their constant replenishment. Malfunctions in the unloading device can cause significant pump failures. To increase the reliability and energy efficiency of mine drainage systems, the method of control of the unloading device was used. During the experimental studies it was found that cavitation phenomena during the operation of pumping units are absent and, accordingly, can not be the cause of wear of the elements of the unloading unit. When the pumps are operating in steady state, the displacement of the rotors was monitored for 3-4 hours on each pump unit. After data processing, it was obtained that the wear of the surface of the unloading rings occurs at a rate of 0.05-0.15mm in one hour. To determine the wear of the rings of unloading during start-up - stop of the pump, at first the indicators of measuring devices at the established mode of operation of the pump unit were fixed. Then the pump was turned off and on again. After starting the pump unit, we made sure that the operating mode of the unloading device did not change and compared the readings of the shaft position indicator before stopping and after starting the pump. From the measurements made it followed that stopping and starting the pump does not lead to noticeable wear of the unloading device. Therefore, it can be assumed that mainly the wear of the discharge rings occurs during the steady operation of the pump unit.

New and safe experimental model of radiation-induced neurovascular histological changes for microsurgical research

2016 ◽  
Vol 51 (2) ◽  
pp. 124-137
Author(s):  
Sergi Barrera-Ochoa ◽  
Irene Gallardo-Calero ◽  
Andrea Sallent ◽  
Alba López-Fernández ◽  
Ramona Vergés ◽  
...  
Keyword(s):  
Side Effects ◽  
Experimental Model ◽  
Experimental Studies ◽  
Neurovascular Bundle ◽  
Control Group ◽  
Sprague Dawley ◽  
Histological Changes ◽  
Group I ◽  
Radiation Induced

The aim is to create a new and safe experimental model of radiation-induced neurovascular histological changes with reduced morbidity and mortality for use with experimental microsurgical techniques. Seventy-two Sprague–Dawley rats (250–300 g) were divided as follows: Group I: control group, 24 rats clinically evaluated during six weeks; Group II: evaluation of acute side-effects (two-week follow-up period), 24 irradiated (20 Gy) rats; and Group III: evaluation of subacute side-effects (six-week follow-up period), 24 irradiated (20 Gy) rats. Variables included clinical assessments, weight, vascular permeability (arterial and venous), mortality and histological studies. No significant differences were observed between groups with respect to the variables studied. Significant differences were observed between groups I vs II–III regarding survival rates and histological changes to arteries, veins and nerves. Rat body weights showed progressive increases in all groups, and the mortality rate of the present model is 10.4% compared with 30–40% in the previous models. In conclusion, the designed model induces selective changes by radiotherapy in the neurovascular bundle without histological changes affecting the surrounding tissues. This model allows therapeutic experimental studies to be conducted, including the viability of microvascular and microneural sutures post radiotherapy in the cervical neurovascular bundle.

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 FEATURES OF EXPERT RESEARCH ON THE EFFECTS OF LOCK PICK ON THE INNER SURFACES OF CYLINDER MECHANISMS OF LOCKS

2019 ◽  
Vol 20 (2) ◽  
pp. 292-308
Author(s):  
V. Chernov ◽  
Е. Golomisyuk ◽  
Р. Evseev
Keyword(s):  
Experimental Study ◽  
Experimental Studies ◽  
Design Features ◽  
Foreign Objects ◽  
False Conclusion ◽  
Internal Surfaces ◽  
Criminal Offenses ◽  
Trace Formation ◽  
Expert Study

The features of the expert study of traces from the effects of foreign objects on the inner surfaces of the cylinder mechanisms are considered. With the trasological examination of locks, most experts after examining the external and internal surfaces of the cylinder mechanisms of locks, unlocked by various types of keys, falsified or selected keys, ambiguously understand the mechanism of their trace formation, which can sometimes lead to a false conclusion. The purpose of the work is to present the results of the investigation of the mechanism of trace formation and localization of signs of exposure of foreign objects (lock pick, selected or fake keys) on the internal surfaces of the cylinder mechanisms of locks and recommendations to forensic experts in drawing conclusions during the course of the Trasological research. The mechanism of trace formation is considered, the characteristic and classification of traces of exposure to foreign objects are provided (lock pick, selected or fake keys). Groups of lock pick are identified, which are most often found in the Commission of criminal offenses, for their further research. A number of experimental studies have been carried out to study and analyze the mechanism of trace formation, as well as to localize the signs of influence of certain groups of lock pick on the internal surfaces of the cylinder mechanisms of the lock. The progress of the experimental studies has been described in stages. The results of the research on the opening of the cylinder mechanisms of locks are presented with various types of lock pick, depending on their design features. The illustrations explain the conditions for the location of traces on the relevant parts of the cylinder mechanisms of locks from the influence of the respective groups of lock pick. The results of an experimental study are summarized and conclusions are made on the possible conditions for the mechanism of trace formation. Recommendations to judicial experts on the formulation of conclusions in the course of trasological studies of cylinder locking mechanisms are proposed.

Hypertensive disorders

ESC CardioMed ◽  
2018 ◽  
pp. 2872-2874
Author(s):  
Renata Cifkova
Keyword(s):  
Blood Pressure ◽  
Laboratory Tests ◽  
Medical Complications ◽  
Pharmacological Management ◽  
Hypertension In Pregnancy ◽  
Hypertensive Disorders ◽  
Hypertensive Disorders In Pregnancy ◽  
Diagnosis Of Hypertension ◽  
In Pregnancy

Hypertensive disorders in pregnancy are the most common medical complications affecting 5–10% of pregnancies worldwide. This chapter discusses the following topics: diagnosis of hypertension, definition and classification of hypertension in pregnancy, additional laboratory tests, management of hypertension in pregnancy, pharmacological management of hypertension in pregnancy, delivery induction, blood pressure postpartum and lactation, and prognosis after pregnancy.

Modelling of Slurry-Handling Piping Element Under Interference Conditions

Volume 3 ◽  
2004 ◽  
Author(s):  
Prem Chand ◽  
K. Govinda Rajulu ◽  
Y. Krishna Reddy
Keyword(s):  
Particle Diffusion ◽  
Test Rig ◽  
Jet Pump ◽  
Two Phase ◽  
New Approach ◽  
Jet Pumps ◽  
Flow Through ◽  
Extensive Experimental Data ◽  
Fluid Interaction ◽  
Layer Concept

The paper presents a new approach to predict the two-phase performance of jet-pumps under interference conditions. We limit our study mainly to diffuser and transport regions of the jet pump. The five essential pre-requisites which form the backbone of our approach are a fairly generalized and accurate approach to (i) solid-fluid interaction, (ii) particle diffusion under generalized flow field, (iii) friction factor-Reynolds number equation, (iv) solid-fluid flow through ducts and (v) mixing of primary and secondary jets using the approach of Wang et al. [1] based on boundary layer concept. The extensive experimental data of several research workers along with fresh data generated on specially designed test-rig support the new approach.

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