scholarly journals Investigation on Water Hammer Control of Centrifugal Pumps in Water Supply Pipeline Systems

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 108 ◽  
Author(s):  
Wuyi Wan ◽  
Boran Zhang ◽  
Xiaoyi Chen
Keyword(s):  
Water Supply ◽  
Method Of Characteristics ◽  
Water Hammer ◽  
Moment Of Inertia ◽  
Evaluation Methodology ◽  
Centrifugal Pumps ◽  
Positive Effects ◽  
Pipeline Systems ◽  
The Moment ◽  
Water Supply Pipeline

Water hammer control in water supply pipeline systems is significant for protecting pipelines from damage. The goal of this research is to investigate the effects of pumps moment of inertia design on pipeline water hammer control. Based on the method of characteristics (MOC), a numerical model is established and plenty of simulations are conducted. Through numerical analysis, it is found that increasing the pumps moment of inertia has positive effects both on water hammer control as well as preventing pumps rapid runaway speed. Considering the extra cost of space, starting energy, and materials, an evaluation methodology of efficiency on the increasing moment of inertia is proposed. It can be regarded as a reference for engineers to design the moment of inertia of pumps in water supply pipeline systems. Combined with the optimized operations of the valve behind the pumps, the pipeline systems can be better protected from accident events.

scholarly journals Transient frequency response based leak detection in water supply pipeline systems with branched and looped junctions

2016 ◽  
Vol 19 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Huan-Feng Duan
Keyword(s):  
Water Supply ◽  
Frequency Response ◽  
Numerical Experiments ◽  
Detection Method ◽  
Leak Detection ◽  
Transient Responses ◽  
Practical Applications ◽  
Supply Pipe ◽  
Pipeline Systems ◽  
Water Supply Pipeline

The transient frequency response (TFR) method has been widely developed and applied in the literature to identify and detect potential defects such as leakage and blockage in water supply pipe systems. This type of method was found to be efficient, economic and non-intrusive for pipeline condition assessment and diagnosis, but its applications so far are mainly limited to single and simple pipeline systems. This paper aims to extend the TFR-based leak detection method to relatively more complex pipeline connection situations. The branched and looped pipe junctions are firstly investigated for their influences to the system TFR, so that their effects can be characterized and separated from the effect of other components and potential leakage defects in the system. The leak-induced patterns of transient responses are derived analytically using the transfer matrix method for systems with different pipe junctions, which thereafter are used for the analysis of pipe leakage conditions in the system. The developed method is validated through different numerical experiments in this study. Based on the analytical analysis and numerical results, the applicability and accuracy as well as the limitations of the developed TFR-based leak detection method are discussed for practical applications in the paper.

Sensitivity Analysis for the Resistance on the Performance of a Pressure Vessel for Water Hammer Protection

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Wuyi Wan ◽  
Wenrui Huang ◽  
Cong Li
Keyword(s):  
Pressure Vessel ◽  
Method Of Characteristics ◽  
Water Hammer ◽  
Pressure Vessels ◽  
Pipeline System ◽  
Hydraulic Pressure ◽  
Extreme Pressure ◽  
Proposed Model ◽  
Optimal Approach ◽  
Water Supply Pipeline

Pressure vessels can greatly protect a water supply pipeline system from water hammer damages. In order to improve the performance of a pressure vessel, a strainer is proposed to compensate the resistance of the connecting pipe. A numerical model and program is established for a pressure vessel with an independent compensation strainer based on the method of characteristics (MOC). Using the proposed model, the hydraulic transient processes are simulated for a pressure vessel with various strainer resistances, and the hydraulic pressure and volume fluctuations are obtained by the proposed model. The influences of resistance on the transient process are analyzed and an optimal approach is suggested to determine the suitable compensation strainer for the pressure vessel. A water hammer protection system is optimized based on the proposed method. The result shows that the compensation strainer can largely affect both positive and negative water hammer pressure. If a suitable strainer is selected based on the proposed approach, the transient surge and extreme pressure distribution will decrease. To some degree, it is simple and convenient to improve a pressure vessel by employing an additional compensation strainer in the pipeline system for water hammer protection.

scholarly journals Water hammer protective performance of a spherical air vessel caused by a pump trip

2019 ◽  
Vol 19 (6) ◽  
pp. 1862-1869 ◽  
Author(s):  
Lin Shi ◽  
Jian Zhang ◽  
Xiaodong Yu ◽  
Sheng Chen
Keyword(s):  
Water Supply ◽  
Method Of Characteristics ◽  
Water Hammer ◽  
Supply System ◽  
Long Distance ◽  
Effective Measure ◽  
Gas Volume ◽  
Protective Performance ◽  
Force Characteristics ◽  
Control Water

Abstract The use of air vessels is an effective measure to control water hammer in a long-distance water supply system. The traditional shape of such vessels is cylindrical. In this paper, an innovative spherical air vessel is proposed to improve the force characteristics of the tank. A mathematical model of the spherical air vessel was established using the method of characteristics. A comparison was performed of water-hammer protection performance between the spherical air vessel and the cylindrical air vessel based on a practical water supply project. Furthermore, a sensitivity analysis on the parameters of the spherical air vessel was performed. The results showed that the spherical air vessels had better protective performance compared with the cylindrical air vessels. Under the same protection requirements, the spherical air vessel can reduce the total volume and surface area by more than 10%. In addition, for a fixed volume of the spherical air vessel, the protective effect improves with the increase of the initial gas volume. Increasing the connecting pipe diameter of the air vessel is beneficial for low-pressure protection, whereas it is adverse to high-pressure protection; in contrast, altering the installation elevation has little effect on water-hammer protection.

Comparative Study on Water-Hammer Method and Barometric-Pulse Method for Water Supply Pipeline Cleaning

ICPTT 2011 ◽  
2011 ◽  
Author(s):  
Ming Zhao ◽  
Xiaoxi Han ◽  
Yuequan Bao ◽  
Guoquan Wu ◽  
Congsheng Liu
Keyword(s):  
Comparative Study ◽  
Water Supply ◽  
Pulse Method ◽  
Water Hammer ◽  
Water Supply Pipeline

Perception of the moment of inertia of hand tools

1982 ◽  
Author(s):  
Carol Zahner ◽  
M. Stephen Kaminaka
Keyword(s):  
Moment Of Inertia ◽  
Hand Tools ◽  
The Moment

Ensuring of irrigation machines application depth in uniformity’s distribution

2020 ◽  
pp. 25-30
Author(s):  
Gennadiy Ol'garenko ◽  
Boris Gordon
Keyword(s):  
Water Supply ◽  
Irrigation Depth ◽  
Application Depth ◽  
Water Supply Pipeline

A method of rain uniformity’s distribution was presented for different spraying devices, which were set on irrigation machines working in different mode of moving. A method for effective irrigation radius and width calculation was justified by using irrigation depth uniformity values from the area under water supply pipeline of the irrigation machine.

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