Investigation of a new shock damper system efficiency in reducing water hammer excess pressure due to the sudden closure of a control valve

2018 ◽  
Vol 26 (3) ◽  
pp. 258-266 ◽  
Author(s):  
Mohammad Bostan ◽  
Ali Akbar Akhtari ◽  
Hossein Bonakdari ◽  
Bahram Gharabaghi ◽  
Omid Noori
Keyword(s):  
Control Valve ◽  
Water Hammer ◽  
Excess Pressure ◽  
System Efficiency

scholarly journals A Water Hammer Protection Method for Mine Drainage System Based on Velocity Adjustment of Hydraulic Control Valve

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Yanfei Kou ◽  
Jieming Yang ◽  
Ziming Kou
Keyword(s):  
Mine Drainage ◽  
Drainage System ◽  
Control Valve ◽  
Mathematic Model ◽  
Distribution Networks ◽  
Water Hammer ◽  
Characteristic Line ◽  
Hydraulic Control ◽  
Protection Method ◽  
Simplex Model

Water hammer analysis is a fundamental work of pipeline systems design process for water distribution networks. The main characteristics for mine drainage system are the limited space and high cost of equipment and pipeline changing. In order to solve the protection problem of valve-closing water hammer for mine drainage system, a water hammer protection method for mine drainage system based on velocity adjustment of HCV (Hydraulic Control Valve) is proposed in this paper. The mathematic model of water hammer fluctuations is established based on the characteristic line method. Then, boundary conditions of water hammer controlling for mine drainage system are determined and its simplex model is established. The optimization adjustment strategy is solved from the mathematic model of multistage valve-closing. Taking a mine drainage system as an example, compared results between simulations and experiments show that the proposed method and the optimized valve-closing strategy are effective.

The Effect of Water Hammer on Pressure Oscillation of Hydrogen Natural Gas Transient Flow

2014 ◽  
Vol 554 ◽  
pp. 251-255 ◽  
Author(s):  
Galadima Agaie Baba ◽  
Amin Norsarahaida
Keyword(s):  
Natural Gas ◽  
Transient Flow ◽  
Splitting Method ◽  
Control Valve ◽  
Pressure Oscillation ◽  
Water Hammer ◽  
Transient Pressure ◽  
Eigenmode Analysis ◽  
Flux Vector Splitting ◽  
Convex Closure

The unexpected closing of a control valve or pumping, which can be planned or accidental could lead to pressure oscillation commonly known as water hammer. Pressure waves oscillation in the fluid flow interaction leads to unsteady state phenomenon. Numerical computation on transient flow model of hydrogen natural gas mixture (HCNG) in a pipeline where different types of valves are considered for effective delivery and safety. Reduced order modeling (ROM) technique is employed in the transient analysis of high pressured HCNG in a short pipe. The flow is governed by a system of Euler equations that are discretized using the implicit Steger-Warming flux vector splitting method (FSM). Eigenmode analysis and the subsequent construction of ROM use only a few dominant flow eigenmodes. The boundary conditions are imposed using the closure law at the upstream and downstream of the pipeline. The effect of closure function is analyzed and the results are presented on different mass ratios and HCNG flow parameters. The transient pressure oscillations of HCNG at different closure functions are compared so as to test the best type of valve for HCNG transportation. The highest and lowest value of transient pressure wave occurs when instantaneous and convex closure law is considered, respectively.

scholarly journals VALVE SELECTION FOR THE PURPOSE OF REDUCING THE WATER HAMMER EFFECT IN A PRESSURIZED PIPELINE

2019 ◽  
pp. 217
Author(s):  
Milica Nikodijevic ◽  
Živojin Stamenković ◽  
Jelena Petrović ◽  
Miloš Kocić
Keyword(s):  
Hydraulic System ◽  
Pressure Rise ◽  
Control Valve ◽  
Water Hammer ◽  
Maximum Pressure ◽  
Transient Regimes ◽  
Butterfly Needle ◽  
Efficient Protection ◽  
Selection For ◽  
Water Hammer Effect

This paper discusses the gravity-fed hydraulic system, which consists of the upper reservoir, the lower reservoir, the pipeline, and valves. To achieve simpler and more efficient protection of a system against water hammer, it is advisable to establish conditions in which the pressure rises as little as possible during transient regimes without using any protective equipment. The discussion focuses on the pressure rise caused by different valve types: butterfly, needle, and ball valves, as well as two valve closure intervals – 20 and 40 seconds. The systems considered have nominal diameters of DN 300 and DN 600. The problem was studied using a simulation of unsteady flow regimes of hydraulic transport. The obtained results regarding the maximum pressure rise due to water hammer were used to select the most satisfactory control valve for the considered hydraulic system.

An Experimental Study to Predict Dynamic Performance of Check Valve by Water Hammer

2019 ◽  
Vol 19 (1) ◽  
pp. 1-12
Author(s):  
Tae-Kook Park ◽  
Yong-Bum Lee ◽  
Jae-Hyeong Kim ◽  
Ki-Chun Lee ◽  
Dong-Cheon Baek
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Check Valve ◽  
Water Hammer

Use of impermeable screens to stabilize the flow in the angle control valve

2016 ◽  
Vol 19 (4) ◽  
pp. 19-24
Author(s):  
A. Babayev ◽  
◽  
V. Goloshchapov ◽  
Keyword(s):  
Control Valve

Simulation of water hammer phenomena using the system code ATHLET

Kerntechnik ◽  
2017 ◽  
Vol 82 (3) ◽  
pp. 280-283 ◽  
Author(s):  
C. Bratfisch ◽  
M. K. Koch
Keyword(s):  
Water Hammer

Application of ultra-high molecular weight polyethylene in a hydraulic drive

2020 ◽  
pp. 77-78
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
High Molecular Weight ◽  
Hydraulic Drive ◽  
Control Valve ◽  
Hydraulic Control ◽  
Hydraulic Motor ◽  
Hydraulic Pump ◽  
Hydraulic Oil ◽  
Ultra High Molecular Weight

The use of ultra-high molecular weight polyethylene (UHMW PE) for the manufacture of various parts, in particular cuffs for hydraulic drives, is proposed. The properties and advantages of UHMW PE in comparison with other polyethylene materials are considered. Keywords ultra-high molecular weight polyethylene, hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic oil, low temperature. [email protected]

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