MODELING OF PUMP OPERATION CONDITIONS IN GRAVITY-PRESSURE COMBINED SYSTEMS

The paper presents the problem of working conditions in gravitationalpressure systems simulation. The practical example takes into account the dynamical analysis of a system equipped with 10 pump stations with different functions. Both local press stations, local stations for shallowing network and transit pumping stations between the towns were used. The model allowed to optimize the active volume of the pump station tanks, the selection of pumps, including the frequency of power on and the time of holding the sewage.

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The Analysis on the Tribological Properties of TPU/PVC Blends under Oil Lubrication

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.774-776.94 ◽

2013 ◽

Vol 774-776 ◽

pp. 94-98

Author(s):

Dao Yuan Pan ◽

Peng Peng Wu ◽

Zhong Xue Gao ◽

Yu Zeng Zhang

Keyword(s):

Working Conditions ◽

Friction And Wear ◽

Oil Lubrication ◽

Wear Properties ◽

Operation Conditions ◽

Hydraulic Steering ◽

Pros And Cons ◽

Friction And Wear Properties ◽

Lubrication Conditions ◽

Better Than

Based on actual working conditions and parameters of the hydraulic steering gear, the purpose is optimizing the rubber seal of steering gear by different rubbers mixing technology. Compare the five kinds of rubber with metal of the friction characteristics in dynamic fit, it can obtain a performance excellent rubber real in the specific operation conditions. And then improve the overall service life of the steering gear. It is first prepared the same hardness TPU and PVC and blends that the ratio is 3:7, 5:5and7:3 in this article. The pros and cons of the five rubbers are analyzed in friction and wear properties of the above experimental. The test curve of coefficient friction and wear with time has been done under different load at constant low speed. It determines TPU/PVC = 3:7 blends through friction and wear and wear mechanism of five rubbers with steel comparatively analyses, and the heat resistance and wear resistance of them are better than the other TPU/PVC blends and PVC under oil lubrication conditions.

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Avoiding Sedimentation and Air Entrainment in Pump Sump for Wet Pit Pumping Stations

Volume 1A: Symposia, Part 2 ◽

10.1115/ajkfluids2015-33761 ◽

2015 ◽

Author(s):

Raja Abou Ackl ◽

Andreas Swienty ◽

Flemming Lykholt-Ustrup ◽

Paul Uwe Thamsen

Keyword(s):

Physical Model ◽

Air Entrainment ◽

Flow Patterns ◽

Operating Conditions ◽

Design Criteria ◽

Flow Conditions ◽

Pumping Station ◽

Pumping Stations ◽

Pump Sump ◽

Pump Stations

In many places lifting systems represent central components of wastewater systems. Pumping stations with a circular wet-pit design are characterized by their relatively small footprint for a given sump volume as well as their relatively simple construction technique [1]. This kind of pumping stations is equipped with submersible pumps. These are located in this case directly in the wastewater collection pit. The waste water passes through the pump station untreated and loaded with all kind of solids. Thus, the role of the pump sump is to provide an optimal operating environment for the pumps in addition to the transportation of sewage solids. Understanding the effects of design criteria on pumping station performance is important to fulfil the wastewater transportation as maintenance-free and energy efficient as possible. The design of the pit may affect the overall performance of the station in terms of poor flow conditions inside the pit, non-uniform und disturbed inflow at the pump inlet, as well as air entrainment to the pump. The scope of this paper is to evaluate the impact of various design criteria and the operating conditions on the performance of pump stations concerning the air entrainment to the pump as well as the sedimentation inside the pit. This is done to provide documentation and recommendations of the design and operating of the station. The investigated criteria are: the inflow direction, and the operating submergence. In this context experiments were conducted on a physical model of duplex circular wet pit wastewater pumping station. Furthermore the same experiments were reproduced by numerical simulations. The physical model made of acrylic allowed to visualize the flow patterns inside the sump at various operating conditions. This model is equipped with five different inflow directions, two of them are tangential to the pit and the remaining three are radial in various positions relative to the pumps centerline. Particles were used to enable the investigation of the flow patterns inside the pit to determine the zones of high sedimentation risk. The air entrainment was evaluated on the model test rig by measuring the depth, the width and the length of the aerated region caused by the plunging water jet and by observing the air bubbles entering the pumps. The starting sump geometry called baseline geometry is simply a flat floor. The tests were done at all the possible combinations of inflow directions, submergence, working pump and operating flow. The ability of the numerical simulation to give a reliable prediction of air entrainment was assessed to be used in the future as a tool in scale series to define the scale effect as well as to analyze the flow conditions inside the sump and to understand the air entrainment phenomenon. These simulations were conducted using the geometries of the test setup after generating the mesh with tetrahedral elements. The VOF multiphase model was applied to simulate the interaction of the liquid water phase and the gaseous air phase. On the basis of the results constructive suggestions are derived for the design of the pit, as well as the operating conditions of the pumping station. At the end recommendations for the design and operating conditions are provided.

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PERENCANAAN DAN ANALISIS KELAYAKAN INVESTASI PROYEK PEMASANGAN KAPASITOR BANK PADA INSTALASI PEMANFAATAN ENERGI LISTRIK

Jurnal Teknik Ilmu Dan Aplikasi ◽

10.33795/jtia.v9i1.16 ◽

2021 ◽

Vol 9 (1) ◽

pp. 77-82

Author(s):

Epiwardi ◽

Ruwahyoto ◽

Heri sungkowo

Keyword(s):

Payback Period ◽

Economic Life ◽

Water Pump ◽

Energy Usage ◽

Capacitor Banks ◽

Water Pumping ◽

Pump Station ◽

Pumping Stations ◽

Feasibility Test ◽

The Cost

The low power factor in the electricity installation of Sumber Wendit 3 water pumping stations causes a bill of excess reactive energy usage or kVARh, so that the cost of using electricity becomes higher. The excess use of reactive energy can be compensated by additional investment in installing capacitor banks in the main distribution panel (MDP) Sumber Wendit 3 water pump station. Based on the data and problems, it is planned to install capacitor banks that meet the standards with a target of 0.90 and 0.95 lagging. From the results of the planning, we need 150 kVAR and 250 kVAR capacitors, with an investment value of Rp. 94,983,790 and - Rp. 120,781,210. After an investment feasibility test using the Payback Period (PP) method, it is known that for a 150 kVAR bank capacitors, the investment return is technically 2.88 months and economically is 4.01 and 3.17 months. For 250 kVAR bank capacitors, the return on investment is technically 3.66 months and economically 5.1 and 4.03 months. When compared with the economic life of the investment is 10 years, the investment of the bank capacitor installation project is very profitable and feasible to carry out

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Human Factor in Smart Industry: A Literature Review

Future Studies Research Journal Trends and Strategies ◽

10.24023/futurejournal/2175-5825/2020.v12i1.473 ◽

2020 ◽

Vol 12 (1) ◽

pp. 87-111 ◽

Cited By ~ 1

Author(s):

Vander Luiz Silva ◽

João Luiz Kovaleski ◽

Regina Negri Pagani ◽

Alana Corsi ◽

Myller Augusto Santos Gomes

Keyword(s):

Literature Review ◽

Working Conditions ◽

Industry 4.0 ◽

Human Performance ◽

Human Factor ◽

Physical And Mental Health ◽

Professional Career ◽

Smart Industry ◽

Constant Improvement ◽

Selection Of

Purpose of the study: The objective of this study is to identify the benefits and challenges of smart industry concept to the human factor, based on the concept of Industry 4.0.Methodology/approach: A systematic literature review was elaborated, based on structured protocols for the selection of a bibliographic portfolio of articles. A bibliometric analysis of the data and content analysis was performed.Originality/relevance: The article discusses human work, focusing on theoretical and practical contributions of international literature. The focus scenario is smart industry, a concept in constant improvement, which currently has acquired influences from Industry 4.0.Main results: The discussions lead us to ponder on human factor in smart industries in the categories physical and mental health at work, human performance and professional career in general. The conclusions points to the need to ensure adequate working conditions in cognitive and psychic aspects, among others.Theoretical and methodological contributions: We present major literature articles, smart industry definitions, main technologies, and grouping benefits and challenges to the human factor.

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SELECTION OF WORKING CONDITIONS AND SUBSTANTIATION OF OPERATING MODE OF FREEZING PIPES IN MAINTENANCE OF FROZEN WALL THICKNESS

Journal of Mining Science ◽

10.1134/s1062739120057203 ◽

2020 ◽

Vol 56 (5) ◽

pp. 857-867

Author(s):

M. A. Semin ◽

L. Yu. Levin ◽

O. S. Parshakov

Keyword(s):

Working Conditions ◽

Wall Thickness ◽

Operating Mode ◽

Frozen Wall ◽

Selection Of

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Above Ground Bioremediation: Two Stage Strategy for the Selection of Optimum Operation Conditions

Contaminated Soil ’95 ◽

10.1007/978-94-011-0421-0_83 ◽

1995 ◽

pp. 1219-1220

Author(s):

I. Gorostiza ◽

M. Zallo ◽

A. I. San Vicente ◽

E. Quintana ◽

I. Muguruza

Keyword(s):

Two Stage ◽

Optimum Operation ◽

Operation Conditions ◽

Selection Of

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Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station

Symmetry ◽

10.3390/sym12050760 ◽

2020 ◽

Vol 12 (5) ◽

pp. 760

Author(s):

Kai Wang ◽

Jianbin Hu ◽

Houlin Liu ◽

Zixu Zhang ◽

Li Zou ◽

...

Keyword(s):

Deposition Rate ◽

Flow Rate ◽

High Speed ◽

Particle Diameter ◽

High Speed Photography ◽

Pump Operation ◽

Pumping Station ◽

Movement Trajectories ◽

Pump Station ◽

The Right

Based on the discrete phase model (DPM) solid–liquid two-phase flow model and MATLAB image processing technology, an integrated prefabricated pumping station was taken as the research object to study deposition characteristics under different flow rates, different particle diameters, and different liquid levels. Considering the incomplete symmetry of the internal flow of the prefabricated pumping station, deposition characteristics of the prefabricated pumping station under single/double pumps were also analyzed. Double pumps were symmetrically distributed in the integrated prefabricated pump station, and the movement trajectories of particles at the bottom of the pump pit under the closing inlet valve were measured through the use of a high-speed photography experiment. Results showed that with the increase of the flow rate, the deposition rate of the separated prefabricated pumping station decreased. With an increase of the particle diameter, the movement of particles was farther away from the vertical barrier weir. In the range of particle diameter of 6 to 10 mm, the deposition rate decreased with the increase of the particle diameter. With the increase of the liquid level, the deposition rate decreased, first, and then increased again. In the case of the single pump operation, the deposition rate of the right pump operation was smaller than that of the left pump operation. The variation of the deposition rate when the right pump operated was basically the same as that when the dual pumps operated. The movement path of particle N1 was longer. With the decrease of the flow rate and the increase of the particle diameter, the following feature of the particle decreased, and it was easier to impact the walls and edges, which caused long-term deposition. The research results could provide some suggestions for the design of anti-deposition performance of prefabricated pumping station.

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Use of a novel acoustic 'listening' method for detecting pump impellor strike on downstream migrating eels

Marine and Freshwater Research ◽

10.1071/mf19205 ◽

2020 ◽

Vol 71 (6) ◽

pp. 571

Author(s):

B. O. David ◽

M. Lake ◽

M. K. Pine ◽

J. Smith ◽

J. A. T. Boubée

Keyword(s):

Test Site ◽

Acoustic Properties ◽

Fish Mortality ◽

Management Options ◽

Acoustic Data ◽

Goldfish Carassius Auratus ◽

Pump Station ◽

Pumping Stations ◽

Global Issue ◽

Passive Acoustic

Fish mortality through floodplain pumping stations is a recognised global issue, but few studies have quantified the degree of mortality that occurs during pumping. We investigated the potential of passive acoustic monitoring (PAM) as a tool to record sounds made by fish and their likely mortality as they passed through pumps during downstream migration. The acoustic properties made by freshly killed eels that were fed through an existing pump station were compared to those made by goldfish (Carassius auratus). Processing and analysis of acoustic data enabled the development of an ‘eel-specific’ algorithm for detecting eels passing through the pumping station. The duration of sound and filtered intensity were useful characteristics enabling reliable separation of the two fish species. The algorithm was then applied retrospectively to soundscape recordings obtained during a typical eel migration period at the test site. Although the tool is unlikely to be able to differentiate the sound of goldfish from ‘other’ potential sounds of short duration (e.g. sticks), differentiating eels from other sounds was demonstrated. We conclude that this tool has considerable potential for improving the understanding of the timing of eel migrations and likely mortality through pumping stations. The tool may also be used to inform the development of both remote and manual pump management options for reducing pump-related eel mortality.

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