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.

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 Integrated Detection of a Complex Underground Water Supply Pipeline System in an Old Urban Community in China

2020 ◽  
Vol 12 (4) ◽  
pp. 1670
Author(s):  
Shifan Deng ◽  
Siyu Ma ◽  
Xiaowen Zhang ◽  
Shiqiang Zhang
Keyword(s):  
Water Supply ◽  
Detection Method ◽  
Urban Community ◽  
Underground Water ◽  
Shaanxi Province ◽  
Water Supply Systems ◽  
Pipeline System ◽  
Detection Scheme ◽  
Integrated Detection ◽  
Water Supply Pipeline

An underground water supply pipeline system is an integral part of urban infrastructure. The safety, stability, reliability, and efficiency of this water system are critical for the daily work and livelihood of the people dependent on it. However, with the development of cities in China, the water supply systems in urban communities require constant re-building and improvement, which complicates the system. Considering the defects of obsolete design, lack of information, and irregularity of the constructions over the years, the maintenance of underground pipelines in older communities is onerous and arduous. In this work, the older pipeline system at the Taibai campus of Northwest University, Shaanxi Province, was taken as one typical old urban community and investigated by different measures. Detection was performed from the available concentrated water supply wells to surrounding areas combining electromagnetic induction, geophysical method by ground-penetrating radar (GPR), and acoustic detection methods. Applying the integrated detection method and considering known pipeline network designs, the properties and complex relationships of different pipeline materials (cast iron, polyethylene (PE), and polyvinyl chloride (PVC)) were determined. In addition, a spatial distribution map of the pipes from wells and the main input water supply pipelines was achieved. The results suggest that the integrated detection scheme combining these three methods provides an effective approach to analyze complex water supply pipelines in older communities, in which each single detection method has more uncertainties. The study provides valuable references for similar communities in many developing countries.

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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