scholarly journals ANALISA HEAD LOSSES DENGAN PENERAPAN SIMULASI PADA DIAMETER PIPA DAN PENGARUH NILAI NET POSITIVE SUCTION HEAD TERHADAP TERBENTUKNYA KAVITASI PADA POMPA

2021 ◽  
Vol 9 (1) ◽  
pp. 17-22
Author(s):  
Siti Aisyah ◽  
Zulham Effendi ◽  
Wahyu Yoga Pratama
Keyword(s):  
Gate Valve ◽  
Head Losses ◽  
Pipe Roughness

Pompa bekerja dengan mengkonversi energi mekanik menjadi energi kinetic dimana sepanjang aliran fluida akan mengalami kerugian aliran yang menyebabkan penurunan tekanan dorong di sisi discharge pompa. Hal ini disebabkan karena gesekan fluida dengan dinding pipa, dan penggunaan elbow, valve, dan lain-lain. Analisa ini bertujuan untuk menghitung besarnya kerugian  tekanan (head losses) pada luas penampang pipa, Nett Positive Suction Head  yang tersedia (NPSHa), dan pada akhirnya akan dibandingkan dengan Nett Positive Suction Head  yang diperlukan (NPSHr) dari pompa. Hasil penelitian diperoleh kecepatan aliran pada pipa hisap dan tekan adalah 0,8567 , bilangan Reynold untuk pipa  4” adalah 295050 m (aliran turbulen), relative pipe Roughness untuk pipa  4” adalah 0,0015, kerugian pada pipa hisap sebesar 0,1082 m, kerugian pada pipa tekan 0,0927 m, kerugian head pada sambungan pipa elbow 900 sebesar 0,0012 m  Kerugian head pada hambatan gate valve sebesar 0,0059 m.

Calibration of Hydraulic Model in Rea-Life Water Distribution System

2012 ◽  
Vol 155-156 ◽  
pp. 285-290 ◽  
Author(s):  
Wei Wei Zhang ◽  
Guo Ping Yu ◽  
Miao Shun Bai
Keyword(s):  
Distribution System ◽  
Water Distribution ◽  
Water Distribution System ◽  
Real Life ◽  
Hydraulic Model ◽  
Calibration Model ◽  
Loading Conditions ◽  
Head Losses ◽  
Real Coded Genetic Algorithm ◽  
Pipe Roughness

The most uncertain input parameters that often considered for calibration in water distribution system hydraulic model are pipe roughness coefficients and nodal demands. Both pipe roughness coefficients and nodal demands are considered to be calibrated in the calibration process, which works alternately. The calibration model was formulated as a constrained optimization problem. The entire head losses under different loading conditions are introduced in the objective function to guide the calibration direction, which can make consistent calibration effects on different loading conditions. The calibration model uses real-coded genetic algorithm along with a general network solver (EPANET 2.0) to adjust pipe roughness coefficients and nodal demands multipliers until the preset criteria are meet. The approach was applied in the calibration of a real-life water distribution system hydraulic model in China, which takes three loading conditions (max, min and average hour) into consider. The results show that the approach works well in achieving good calibration results, which match field observation in a reasonable level and meet engineering requirements.

Compact expanding gate valve

2018 ◽  
Vol 8 (1) ◽  
pp. 112-119
Author(s):  
Vladimir I. Voronov ◽  
◽  
Ilya A. Flegentov ◽  
Alexander N. Petelin ◽  
◽  
...  
Keyword(s):  
Gate Valve

scholarly journals New Power Train Concept for a City Hybrid Vehicle

Proceedings ◽  
2020 ◽  
Vol 58 (1) ◽  
pp. 6
Author(s):  
Roberto Capata
Keyword(s):  
Gate Valve ◽  
Rotation Speed ◽  
Electrical Power ◽  
Real Field ◽  
Power Train ◽  
Hybrid Propulsion ◽  
Performance Point ◽  
Original Group ◽  
Combustible Gases ◽  
Mechanical Decoupling

This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car ICE (900cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation of the compressor with a dedicated electric motor and connecting a turbine to a generator. Mechanical decoupling will allow both machines to be designed for operating closer to their maximum performance point, for most of the expected real field of operation. Specifically, the turbine is likely to have a slightly lower rotation speed than the original group and will, therefore, be slightly larger. The advantage is that, while in the current supercharger groups the surplus at high regimes is discharged through the waste-gate valve without expanding in a turbine, in the configuration proposed, all the energy of the combustible gases is used by the turbine to generate electrical power that can be used where required. Once the motorization of the vehicle (999 cc) has been fixed, the two turbomachines will have to be studied and designed, looking, where possible, for commercial components. Finally, a CFD will be needed to verify the validity of the choice, followed by careful experimentation campaigns.

scholarly journals Casting process of gate valve steel based on ProCAST simulation

2021 ◽  
Vol 1798 (1) ◽  
pp. 012013
Author(s):  
Shanpeng Qin ◽  
Peng Lv ◽  
Sirun Li ◽  
Yongcun Li
Keyword(s):  
Gate Valve ◽  
Casting Process ◽  
Valve Steel

Culvert inlet efficiency

1995 ◽  
Vol 22 (3) ◽  
pp. 611-616 ◽  
Author(s):  
C. D. Smith ◽  
A. G. Oak
Keyword(s):  
Key Words ◽  
Experimental Work ◽  
Control Efficiency ◽  
Head Losses ◽  
Coefficient Of Discharge ◽  
The University

The results of experimental work carried out on culvert inlet efficiency at the University of Saskatchewan are reported in this paper. Efficiency is reported in terms of coefficient of discharge when the culvert operates with inlet control, and in terms of the coefficient of entrance loss when the culvert operates with outlet control. A larger coefficient of discharge or a smaller coefficient of entrance loss represents a higher efficiency. Seven different culvert inlets were tested for both inlet and outlet control, and for the headwater level both above and below the elevation of the crown of the pipe at the inlet. The results are reported in nondimensional charts. Key words: culvert flow, inlet control, outlet control, efficiency, head losses, capacity.

scholarly journals Preliminary Analysis of a New Power Train Concept for a City Hybrid Vehicle

Designs ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 19
Author(s):  
Roberto Capata
Keyword(s):  
Gate Valve ◽  
Combustion Engine ◽  
Fluid Dynamic ◽  
Electrical Power ◽  
Real Field ◽  
Power Train ◽  
Hybrid Propulsion ◽  
Performance Point ◽  
Combustible Gases ◽  
Mechanical Decoupling

This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car internal combustion engine ICE (900 cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation of the compressor with a dedicated electric motor and connecting a turbine to a generator. Mechanical decoupling will allow both machines to be designed for operating closer to their maximum performance point, for most of the expected real field of operation. Specifically, the turbine is likely to have a lower rotation speed than the original group and will, therefore, be slightly larger. The advantage is that, while in the current supercharger groups the surplus at high regimes is discharged through the waste-gate valve without expanding in a turbine, in the configuration proposed, all the energy of the combustible gases is used by the turbine to generate electrical power that can be used where required. Once the motorization of the vehicle (999 cc) has been fixed, the two turbomachines will have to be studied and designed, looking where possible, for commercial components. Finally, a computational fluid dynamic CFD will be needed to verify the validity of the choice, followed by careful experimentation campaigns.

Technical regulation for the values of hydraulic parameters of used metal pipes in order to extend the period of their use

2021 ◽  
Vol 18 (3) ◽  
pp. 421-427
Author(s):  
Oleg A. PRODOUS ◽  
◽  
Lev D. TEREKHOV ◽  
Petr P. YAKUBCHIK ◽  
Alexander S. CHERNIKH ◽  
...  
Keyword(s):  
Practical Importance ◽  
Hydraulic Calculation ◽  
Technical Regulation ◽  
Supply Networks ◽  
Steel Pipes ◽  
Head Losses ◽  
Metal Pipes ◽  
Inner Diameter ◽  
Pumping Equipment ◽  
The Given

Objective: To compare the characteristics of hydraulic potential in worn steel pipes with internal deposits subjected to cleaning by mechanical and chemical methods. Methods: Calculated dependencies are used for hydraulic calculation of new metal pipes and pipes with internal deposits. Results: A calculated dependence was obtained to determine the value of the inner diameter of pipes with any thickness of the layer of internal deposits. The concept of an efficient pipeline is introduced and a comparison made of the values of head losses in new pipes and in pipes with internal deposits. A specific practical example is considered. For the given example, compare the values of energy consumption of pumping equipment for two methods of cleaning the inner surface of pipes. Measures are indicated to ensure the efficiency of operation of water supply networks. Practical importance: It is shown that the chemical method of technical regulation of the hydraulic characteristics of new steel pipes provides an extension of the period of their further use.

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