Different Types Of Pumps Research Articles

STUDY OF OPTIMIZATION OF THE STRUCTURAL DESIGN OF SUPPORT UNITS OF PUMPJACKS

Oil extraction is carried out in three ways: fountain, gas elevator, and pumping. The claim that the time of flowing wells is long over is not negotiable. But we can agree that the leading role in oil production is. Although there are different types of pumps, such as plunger, centrifugal, screw, hydraulic piston, jet, etc., more common for this method are. And the main drive of downhole rod pumps has been pumpjacks for more than a century. This article considers the justification of the possibility of improving the pumpjack design through self-lubricating sliding bearings in low-speed units. Keywords: oil production pumping, balancing pumpjack, rolling bearings, self-lubricating sliding bearings.

A Review of Pump Cavitation Fault Detection Methods Based on Different Signals

As one of the research hotspots in the field of pumps, cavitation detection plays an important role in equipment maintenance and cost-saving. Based on this, this paper analyzes detection methods of cavitation faults based on different signals, including vibration signals, acoustic emission signals, noise signals, and pressure pulsation signals. First, the principle of each detection method is introduced. Then, the research status of the four detection methods is summarized from the aspects of cavitation-induced signal characteristics, signal processing methods, feature extraction, intelligent algorithm identification of cavitation state, detection efficiency, and measurement point distribution position. Among these methods, we focus on the most widely used one, the vibration method. The advantages and disadvantages of various detection methods are analyzed and proposed: acoustic methods including noise and acoustic emission can detect early cavitation very well; the vibration method is usually chosen first due to its universality; the anti-interference ability of the pressure pulsation method is relatively strong. Finally, the development trend of detecting cavitation faults based on signals is given: continue to optimize the existing detection methods; intelligent algorithms such as reinforcement learning and deep reinforcement learning will be gradually integrated into the field of cavitation status identification in the future; detection systems still need to be further improved to accommodate different types of pumps; advanced sensing devices combined with advanced signal processing techniques are one of the effective means to detect cavitation in a timely manner; draw on other fault detection methods such as bearing faults and motor faults.

INVESTIGATION OF THE ENERGY CHARACTERISTICS OF CENTRIFUGAL PUMPS

A hydraulic device that is used to suck up liquid, move it under pressure or pump it, is called a pump. As a rule, any movement of a liquid by similar aggregates is carried out due to the transfer of potential or kinetic energy to it. Depending on the technical indicators, different types of pumps are used. At the same time, they differ in efficiency, power, volumes of fluid pumped per unit time, maximum head and resulting pressure. The most used group of pumps are vane pumps. Their distinctive feature is the impeller rotating in a fixed housing, equipped with blades. Depending on the warehouse of the impeller and the conditions for moving fluid through it, vane pumps are divided into centrifugal and vortex. With a centrifugal pump, liquid is supplied due to the centrifugal force that appears when the impeller rotates. She is carried away by the blades and, under the action of centrifugal force, moves from the middle of the wheel to the edges along the blades. The blades of the impellers are bent in the direction of rotation backwards. The number of blades is usually from 6 to 8 pieces. But special pumps for impure liquids, in order to increase the cross section of the channels in the wheel, are installed with a smaller number of blades from 2 to 4 pieces. Centrifugal pumps are usually installed above the liquid level in the receiving tank, so they must be filled before use. The pump is filled with a check valve on the suction line through the filling funnel until the gas is completely expelled from the suction pipeline and the pump housing. In the absence of a check valve, for filling, air is forced out of the pump housing with the valve closed by a special vacuum pump. The same is done when filling large pumps. Centrifugal pumps are characterized by a rather high efficiency, compactness and durability of use. Based on the numerical modeling of hydrodynamic processes, a substantiation of adjustment of the design of the working wheels of centrifugal pumps is given. Mathematical modeling of the fluid flow in the running part of the centrifugal pump is performed. The results of the CFD calculation are analyzed, after which an experimental work wheel is created, and its tests are carried out. There is a process of comparing a serial and experimental pump. Keywords: Centrifugal pumps, numerical modeling, mathematical model, energy characteristics, hydrodynamic processes, dynamic characteristics, power engineering, working wheel, working fluid, working wheel vanes.

A REVIEW STUDY IN TROUBLESHOOTING OF HYDRAULIC SYSTEMS IN CEMENT INDUSTRIES

Behind every hydraulic system there exists critical components that influence power transmission. To improve talent you should recognize how these components operate and affect the system i.e. learn the kinds of filter and piping used in hydraulic systems, describe the types and functions of hydraulic seals, and explain the operating principles of different types of pumps, and further learning the types and uses of accumulators, control valves, relief valves, cylinders, and even actuators. In this research study appropriate problem-solving processes are applied, and this helps to comprehend the hydraulic concepts and hydraulic schematic representations. Therefore, it will enhance the knowledge and the capacity of troubleshooting the different hydraulics systems in the cement industry. This will enable the person to stay on top of the industry practices in hydraulics, explore the basics of a hydraulic system by reviewing the types and properties of hydraulic fluids, identifying the symbols used on hydraulic schematic representations, and explaining hydraulic circuit operations based on a schematic design.

Design of energy efficient electrotechnical complexes with an autonomous electric supply system

Improving energy efficiency and reducing the costs of creating an autonomous power supply complex for an oil production enterprise is an urgent problem and requires a rational solution. At each stage of the electrical complex development of the oil production enterprise, the purpose is to increase energy efficiency in order to reduce the unit cost of electricity per unit of produced well fluid volume. The electrical complex energy efficiency assessment of the oil production enterprise can be determined by the classical methodology of the energy balance. The task of increasing the energy efficiency of the electrical complex with an autonomous power supply system is to ensure a minimum of fuel costs while maintaining current oil production. Two types of the electrical complex models are proposed: with an individual electricity source and a generation center based on individual diesel generators. A method for calculating the energy parameters of the electrical complex components with installations of different types of pumps is presented. In this case, the energy efficiency is improved due to joint deep and group reactive power compensation and power factor correction by reducing the harmonic components of the current. The electrical complex simulation of a submersible electric motor has been carried out in order to determine the values of voltage and current during switching processes. The autonomous power supply system modeling of an oil production enterprise in case of voltage losses and the simulation of diesel generators with a frequency deviation of the generated voltage during load surges was carried out.

Simulation study on flow rate accuracy of infusion pumps in vibration conditions during emergency patient transport.

Infusion pumps are frequently used when transferring critically ill patients via patient transport cart, ambulance, or helicopter. However, the performance of various infusion pumps under these circumstances has not been explored. The aim of this study was to evaluate the flow rate accuracy of infusion pumps under various clinical vibration conditions. Experiments were conducted with four different types of pumps, including two conventional syringe pumps (Injectomat MC Agilia, Fresenius Kabi and TE-331, Terumo), one conventional peristaltic pump (Volumed μVP7000; Arcomed), and one new cylinder pump (H-100, Meinntech). The flow rate was measured using an infusion pump analyzer on a stable table (0m/s2) for 1h with 1ml/h and 5ml/h. Experiments were repeated in mild vibration (2m/s2) (representing vibration of patients in a moving stretcher or ambulance), and in moderate vibration (6m/s2) (representing vibration in helicopter transport). Any accidental bolus occurrence in extreme vibration situations (20m/s2) was also analyzed. Simulated vibrations were reproduced by a custom-made vibration table. In the resting state without vibration and in mild vibration conditions, all pumps maintained good performance. However, in moderate vibration, flow rates in syringe pumps increased beyond their known error ranges, while flow rates in peristaltic pumps remained stable. In extreme vibration, accidental fluid bolus occurred in syringe pumps but not in peristaltic pumps. The newly developed cylinder pump maintained stable performance and was unaffected by external vibration environments.

Modeling and Computational Simulation of Cable Pulling Winch Machine

Underground cable laying is the process of laying electrical or telecommunication cables underground. It is the replacement of overhead cable laying. Even though it is expensive, it is mostly practiced in developed countries because of its many advantages as it can transmit power across densely populated or areas where land is costly or environmentally or aesthetically sensitive. This paper focuses on developing a mathematical model for simulating and analyzing the cable pulling winch machine which is used in the underground cable laying process. The machine is modeled in MATLAB Simulink by creating a custom block library. The library developed for testing the cable pulling winch machine is based on the available data from the manufacturer. Using the MATLAB Simulink model, the winch machine is tested for its performance using different types of pumps to arrive at the optimum. This model can also be used in the future for analyzing other components in the machine and to incorporate control systems for superior control and performance of the machine.

Risk Analysis for Pumping Equipment Operation

It is established that centrifugal pumps are more reliable than gear pumps. However, their efficiency decreases when the viscosity of the fluid pumped by the centrifugal pump increases, which makes their use at some oil facilities inadvisable. An accident risk assessment was made at a hazardous production facility for use of different types of pumps. Several measures have been developed to reduce accident risk when the facility is equipped with gear pumps. It is concluded that some petrochemical and oil refining facilities of the Russian Federation can be equipped with gear pumps.

A simulation study on the performance and safety of various infusion devices in clinically possible vibration situations

Introduction: Infusion devices are frequently used when transferring critically ill patients using various measures including moving cart, ambulance, or helicopter. However, the performance of various infusion devices has not been explored under these circumstances. Objectives/Aims: We aimed to evaluate the performance of the infusion devices under clinically possible vibration conditions. Methods: Experiments were conducted using four different types of pumps; two conventional syringe pumps (Injectomat MC Agilia, Fresenius Kabi) and one conventional infusion pump (Volumed VP 7000, Arcomed), and a new-generation cylinder pump (H-100, Meinntech) which is a convertible infusion and syringe pump. The flow rate was measured using the infusion pump analyser (IDA 4 Plus, Fluke biomedical) on the stable table for 1 hour with 1ml/h and 5ml/h. Experiments were repeated in the mild vibration (2m/s2), which is vibration in the patients moving cart or ambulance, and in moderate vibration (6m/s2), which is vibration in the helicopter transport. Vibration level of the vibrating table was measured using a vibrating meter (VM-6360). In addition, experiment with accidental bolus in extreme vibration situations was done. Results: In the resting state without vibration and the mild vibration condition, all the pumps showed comparable results within clinically acceptable error range. However, in moderate vibration condition, it was observed that an inadvertent bolus dose of the drug was injected accidentally in both conventional syringe pumps. In the case of the infusion pump, overall less amount was injected than the specified amount. For a new generation cylinder pump, it was possible to prevent accidental bolus injection in vibration and inject the desired amount. Conclusion: In mimicking clinical vibration situations, most of infusion devices worked well. However, the conventional infusion pump was infused less than the desired amount, and the conventional syringe pump was infused unintentionally in a strong vibration, which required a careful attention.

Dalgıç Tip Atık Su Pompalarının Karakteristiklerinin Belirlenmesine Yönelik Test Sistemi Tasarımı

Bu çalışmada; 3- 22 kW arası enerji gereksinimine sahip dalgıç tip atık su pompalarının karakteristik eğrilerinin belirlenmesine yönelik sabit bir test platformunun tasarımı ve imalatı gerçekleştirilmiştir. Dalgıç tip atık su pompaları tarım işletmelerinde (sıvı gübrenin nakli vb.), köprü ve alt geçitlerde ve endüstriyel uygulamalarda atık suların tahliyesi vb. uygulama alanlarında kullanılmaktadır. Pompa imalatında pompa performanslarının hatasız bir şekilde belirlenmesi AR-GE faaliyetlerinde yapılan iyileştirme ve geliştirme çalışmalarını doğrudan etkilemektedir. Bu amaçla bu çalışma Konya sanayisinde faaliyet gösteren ve farklı tiplerde pompa imalatı yapan bir işletmede gerçekleştirilmiştir. Test standı TS 12599 standardı ve santrifüj pompa tasarım ilkeleri göz önüne alınarak DN 80, DN 125 ve DN 150 standart boru çaplarında 3 farklı hat şeklinde tasarlanmış ve imal edilmiştir. Pompa denemeleri sonunda sistem pompa karakteristik eğrilerini oluşturmakta ve çıktı olarak kullanıcıya vermektedir.

Wall roughness influence on the NPSH characteristics of centrifugal pumps

Pumps are very important and very widespread energetic machines. They are used in all branches of industry. Pumps are also a major consumer of electricity and therefore their development is even more important. From theoretical through experimental development in the last decades, a quantity of research has focused on numerical analysis. These are used to optimize all kinds of characteristics, from energy and cavitation, to dynamic characteristics. At the beginning of Computational Fluid Dynamics (CFD) analyses were related to the physical model (potential flow, Euler equation, Navier-Stokes equations). Subsequently, a lot of research was carried out in the field of various turbulent models. With the launch of high performance multi-processor computers, more and more time-dependent problems have been analysed. All the above mentioned research was carried out with numerical calculations on smooth surfaces. The fact is that in reality there is always some roughness on wet surfaces, depending on the material, the technology of production of certain parts of machines and finishing surface treatment. In the article, we give preliminary results of numerical analyses of centrifugal pumps, where the roughness of the walls was taken into account. The analyses were completed for different types of pumps, with different roughnesses and for different characteristics. First he effect of the roughness on the efficiency is shown, further the cavitation characteristics were analysed. The basic idea for research comes from the fact that there are still many cases where the matching of the results of the measurements and the results of numerical analyses are not perfect. One of the possible reasons can be the roughness of the walls.

Analysis of the operation of pumps when used in biogas plants

Purpose. Analyze the operation of pumps when used in biogas plants and the features of their use. Provide guidance on the use of different types of pumps, their advantages and disadvantages, and features of maintenance. Methods. In the analysis of different types of pumps the methods of system and comparative analysis, scientific generalizations and method of argumentation are used. Results. The article analyzes existing pump designs for pumping manure (substrate). The comparative characteristics of the following pumps, which are most commonly used in biogas plants, are given: centrifugal, eccentric auger and rotary piston. As a result of the analysis the characteristics of their application, advantages and disadvantages, variants of structures and features of maintenance were obtained. Conclusions. The choice of suitable pumps according to the capacity and characteristics depends largely on the substrates used, their degree of preparation and/or dry matter content. An analysis of existing designs has shown that the use of plunger pumps (especially rotary ones) has many advantages over centrifugal ones: the ability to work with viscous substrates, self-priming and more pressure stable, suitable for substrate dosing, easy to maintain. Keywords: pump, biogas plant, methane tank, substrate, sludge, dry matter, manure.

DEGRADATION STAGE RECOGNITION OF BEARING WITHIN LIFE CYCLE

Bearings are important components in nuclear plant system, which are widely applied in different types of pump, electromotor and generator. In long term operation status, bearing performance would degenerate due to fatigue and bad lubrication. The damage of bearings would influence the performance and even the safety of devices. Therefore, it is extremely essential to obtain the operational condition information of bearings during the entire life cycle. In order to monitor and identify the bearing conditions in the entire life cycle, a degradation stage recognition method is proposed in this study. The recognition method consists of 4 main steps: firstly, extract a part of samples from the four stages (normal, early fault, medium fault, terminal fault) of bearing life cycle data set; secondly, extract the signal feature with multiscale permutation entropy technique; then, using the dimensional reduced sample features to train a pattern recognition classifier; finally, applying the classifier to identify the signal samples from the life cycle data set. With this automatic recognition method, the performance and degradation stages in the entire life cycle of bearings can be efficiently and effectively identified without additional manual assistance. The feasibility of this method depends on both of the effective recognition technique and the completion of data for classifier training. Thence, the processing technique improvement and the sustained operation data collection are indispensable for extending the method application to other components and devices.

Benefits of adopting lean production on green performance of SMEs: a case study

Small- and medium-sized enterprises (SMEs) are widely recommended to strive, not only for their performance in operational side, but they need to integrate the environmental dimension. To do that, the literature widely indicates a positive impact of lean practices on green performance. However, very few studies have been carried out in SMEs context. In this view, this paper aims at providing through a practical case study of lean implementation in a real-life small manufacturing company, the information to confirm this synergy between lean and green performance. To achieve this aim, a proposed framework of lean and green integration has been implemented in a SME producing different types of pumps. The results achieved shows that there is a strong correlation between operational metrics improvement and green metrics improvement. Moreover, the benefits of lean practices such as 5S, Kanban, SMED, AM, cellular manufacturing and quality control on green performance are widely demonstrated. Future work could study other processes and explore other case-specific supporting tools and techniques.

Common-Mode Overvoltage Mitigation in a Medium-Voltage Pump Motor Transformerless Drive in a Mining Plant

The mining process requires different types of pumps to transfer fluids from one point to another. In the majority of applications, those pumps are driven by variable speed motor drives in order to improve the energy efficiency of the overall system. Large pumps, ranging from hundreds of kW to a few MW, usually demand medium-voltage converters. Transformerless converters reduce the footprint required for the installation, but give rise to additional concerns related to the common-mode voltages applied to the system and motor. The absence of an isolation transformer along with the use of pulse-width modulated rectifiers are the root causes of this issue. This concern increases when long cables are needed to connect the converter to the motor. This paper presents an application where three-level neutral point clamped transformerless medium-voltage converters are applied to drive motor pumps in a mining plant. The passive filtering techniques used to address the common-mode voltage issues are analyzed through simulations. The proposed solutions are field tested with successful results.

Comparison of Pumping Regimes for Water Distribution Systems to Minimize Cost and Greenhouse Gases

AbstractA single-objective optimization model has been developed for water distribution system (WDS) pumping operations, considering five different types of pump operating regimes. These regimes use tank trigger levels, scheduling, and a combination of both to control pumps. A new toolkit development to alter rule-based controls in hydraulic simulation software has allowed more complex pump operating regimes than have previously been considered to be optimized. The performance of each of the regimes is compared with respect to two different objectives: cost and greenhouse gas (GHG) emissions, which were optimized separately to allow the comparison of regimes to be made more clearly. Two case study networks, including one that represents a segment of the South Australian WDS, illustrate the effectiveness of the model. Time-based scheduling operating strategies were found to perform better than the other types of pump operating regimes. Significant cost savings were achieved for the South Australian case st...

КОМПАНИЯ «CRYOSTAR» УКРЕПЛЯЕТ ЛИДИРУЮЩИЕ ПОЗИЦИИ В мировом КРИОГЕННОМ МАШИНОСТРОЕНИИ

Cryogenic reciprocating and centrifugal pumps are widely applied in processes of manufacture, storage, transport and use of cryogenic liquid products, such as oxygen, nitrogen, argon, liquefied natural gas (LNG). Pumps Company «Cryostar» (Ezing, France) characterized by high quality and guaranteed reliability. It is shown how the company is expanding the scope of manufactured pumps created LNG vehicle refueling stations or natural gas, gasified under pressure; constructed in various MEGA-plants; CNG regasification systems; the powerful engines of ships. Promotion of innovative equipment «Sryostar» in Russia and Belarus has been the company «NII KM» (Moscow), which successfully applies it also implemented in their own projects. It reported on the establishment of the company «Сryostar» new test facility with great opportunities to test different types of pumps. This will allow the company to strengthen its leading position in the global cryogenic engineering.

The choice of the optimum pump station aggregates structure of pipeline systems while designing and reconstructing

The optimal selection of the structure of pump station aggregates in the process of design and reconstruction is considered. The task is formulated and the method of solution is presented. The minimum amount of capital and operating costs at the pump station during the entire project period is used as an optimization criterion. The talk of optimal selection of the structure of pump station aggregates is one of the most important tasks in optimal design of piping systems. To ensure the design values of operating parameters at the output of each projected pump station it is necessary to choose the structure of pump aggregates so that to reach the minimum amount of capital and operation costs during the entire project period. After solving the task the resulting recommendations on the pumping equipment structure of the designed pumping station should not only ensure the controllability of the pipeline network flux-distribution but also deliver the minimum amount of capital and energy costs. The method of simulation was used to solve this task. The procedure of the automated selection of pumping station equipment based on the generation of different structures engaging regulated and non-regulated pumps was developed and as a result of data processing of the ranges of different types of pumps it allows selecting the most cost-efficient pump station structure to ensure specified design values of daily schedule changes of feeding and pressure at the output. The method of branches and boundaries was used as the optimization method. A great number of received results of modeling existing pump stations of water supply and calculation of their optimal regimes has shown that to ensure a smooth feed control of pumping station in the whole range of its consumption it is enough, as a rule, to equip with a variable speed drive only one the most powerful pump unit.

Bridge to recovery in two cases of dilated cardiomyopathy after long-term mechanical circulatory support.

Ventricular assist devices (VADs) have become an established therapeutic option for patients with end-stage heart failure. Achieving the potential for recovery of native heart function using VADs is an established form of treatment in a selected group of patients with HF. We report two cases of VAD patients with different types of pump used for mechanical circulatory support, a continuous flow pump (Heart-Ware®) and a pulsatile pump (POLVAD MEV®), which allow regeneration of the native heart. Patients were qualified as INTERMACS level 3-4 for elective implantation of an LVAD. Implantations were performed without complications. The postoperative course was uncomplicated. In the HeartWare patient the follow-up was complicated by episodes of epistaxis and recurrent GIB as well as driveline infection. The follow-up of the POLVAD MEV patient was uneventful. Recurrent GIB forced us to withdraw aspirin and warfarin therapy and maintain only clopidogrel in the HeartWare patient.. In mid-February 2013 the patient was admitted due to dysfunction of the centrifugal pump with a continuous low-flow alarm and increase power consumption. Under close monitoring of the patient a decision was made to stop the pump immediately and evaluate cardiac function. The serial echocardiography studies showed significant improvement in LVEF up to 45% and no significant valvular pathology. In February 2013 LVAD explant was performed by left thoracotomy without complications. At six-month follow-up the patient was in a good clinical condition, in NYHA class I/II, and on pharmacological treatment.

Ostéosynthèse percutanée temporaire et greffe antérieure sélective dans les fractures thoracolombaires

In this preliminary investigation, a so-called Blenke cascade and plate heat exchanger bioreactor configuration were compared in terms of mixing characteristics, contamination free process, operational power costs and overall performance. At room temperature, fermentation was initially started as batch run and switched to continuous operation, when the residual sugars within the reactor were detected to be C ⩽ 1% (g/L). Samples from both configurations were taken and analyzed for ethanol and residual sugar content, as well as for any infection of the fermentation and lactic acid content, respectively. Mixing characteristics were studied by the residence time distribution method. Both geometries behaved as a finite number n of continuous stirred tanks in series, behaving as a plug flow with superimposed axial dispersion. The number of tanks in series n obtained in the plate heat exchanger configuration was 1.5–3 times larger than those in the Blenke cascade. The average ethanol productivity was Qp = 3.07 (g/L h) and Qp = 2.31 (g/L h) for cascade and plate exchanger configuration, respectively. The analysis of operational power costs indicates relevant differences between the two reactors at laboratory scale; however, systems with different types of pumps and viscosities are compared. From an industrial scale point of view, specific operational costs decrease with scale-up, as no mechanical mixing is needed in the fermenters.