• Title/Summary/Keyword: pipe networks

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Determining the Time of Least Water Use for the Major Water Usage Types in District Metered Areas (상수관망 블록의 대표적인 용수사용 유형에 대한 최소 용수사용 시간의 결정)

  • Park, Suwan;Jung, So-Yeon;Sahleh, Vahideh
    • Journal of Korean Society of Water and Wastewater
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    • v.29 no.3
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    • pp.415-425
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    • 2015
  • Aging water pipe networks hinder efficient management of important water service indices such as revenue water and leakage ratio due to pipe breakage and malfunctioning of pipe appurtenance. In order to control leakage in water pipe networks, various methods such as the minimum night flow analysis and sound waves method have been used. However, the accuracy and efficiency of detecting water leak by these methods need to be improved due to the increase of water consumption at night. In this study the Principal Component Analysis (PCA) technique was applied to the night water flow data of 426 days collected from a water distribution system in the interval of one hour. Based on the PCA technique, computational algorithms were developed to narrow the time windows for efficient execution of leak detection job. The algorithms were programmed on computer using the MATLAB. The presented techniques are expected to contribute to the efficient management of water pipe networks by providing more effective time windows for the detection of the anomaly of pipe network such as leak or abnormal demand.

Assessment of the Deterioration of Large-Diameter Pipe Networks (I) : Development of an Assessment Model (대구경 관로의 노후도 평가 연구(I) : 평가모형 개발)

  • Kim, Eung-Seok;Lee, Seung-Hyun;Yoon, Ki-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.1
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    • pp.482-487
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    • 2014
  • The purpose of this study (I) is to provide a new methodology for evaluating deterioration of buried pipe networks for the large-diameter old pipe improvement project currently performed by K-water. To develop a new assessment model for large-diameter pipe deterioration, this study has investigated the three representative methods for the pipe deterioration assessment such as evaluation methods 1995 and 2002, and the state evaluation method through literature reviews. The ten assessment factors were selected by considering large-diameter pipe characteristics as well as common factors with high priority in the three methods. Also, the weighting of the factors was estimated by a regression equation from experiments and analysis on domestic large-diameter pipelines and expert survey data. It is expected that the new assessment model developed by analysing the existing three models is more reliable to assess the deterioration of large-diameter pipe networks.

Study on the applicability of the principal component analysis for detecting leaks in water pipe networks (상수관망의 누수감지를 위한 주성분 분석의 적용 가능성에 대한 연구)

  • Kim, Kimin;Park, Suwan
    • Journal of Korean Society of Water and Wastewater
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    • v.33 no.2
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    • pp.159-167
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    • 2019
  • In this paper the potential of the principal component analysis(PCA) technique for the application of detecting leaks in water pipe networks was evaluated. For this purpose the PCA was conducted to evaluate the relevance of the calculated outliers of a PCA model utilizing the recorded pipe flows and the recorded pipe leak incidents of a case study water distribution system. The PCA technique was enhanced by applying the computational algorithms developed in this study which were designed to extract a partial set of flow data from the original 24 hour flow data so that the effective outlier detection rate was maximized. The relevance of the calculated outliers of a PCA model and the recorded pipe leak incidents was analyzed. The developed algorithm may be applied in determining further leak detection field work for water distribution blocks that have more than 70% of the effective outlier detection rate. However, the analysis suggested that further development on the algorithm is needed to enhance the applicability of the PCA in detecting leaks by considering series of leak reports happening in a relatively short period.

A Study on Design Support Technique for Water Distribution Network using GIS (GIS를 이용한 상수관로 설계지원 기법 연구)

  • Cho, Hyo-Seob;Choi, Seung-Chul;Lee, Gi-Ha;Cho, Bok-Hwan;Kim, Jeong-Yup
    • Journal of the Korean Association of Geographic Information Studies
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    • v.8 no.2
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    • pp.103-116
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    • 2005
  • Although there have been many researches to construct a database of water distribution networks using GIS, most of them were not linked with an model for the analysis of pipe networks because it is difficult to make spatial data about complex water distribution networks for building a detail model. Therefore, it is necessary to develop the method based on GIS to build geographical data for design of water distribution pipeline systems. In this study, an innovated design support technique using GIS is proposed for a hydraulic analysis model of water distribution networks. With the function of spatial analysis in GIS system, the results from a pipe network model are used to analyze the suitability of the location of pipeline network, the spatial suitability comprised the analysis of the degree of pipe age, the altitude distribution of water pressure, and the water supply system for the customer.

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Seismic Analysis of Firefighting Pipe Networks (소방배관 형상에 따른 배관 내진해석)

  • Choi, Ho-Sung;Lee, Jae-Ou
    • Fire Science and Engineering
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    • v.33 no.5
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    • pp.149-154
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    • 2019
  • The stability of firefighting pipes is crucial in the event of an earthquake. In Korea, specification-based designs are used in accordance with NFSC. However, engineering performance-based designs are used for buildings that have special requirements. For firefighting pipes, tree type pipe networks are usually utilized in buildings; however, they are characterized by several limitations. Hence, grid type and loop type networks are being utilized lately. Earthquake-resistant designs for firefighting pipes in Korea utilize NFPA 13 as the cookbook. Nevertheless, an engineering analysis is required to verify its reliability. The NFPA 13 standard used in Korea is a design method for engineers who lack earthquake engineering analysis knowledge of pipes and adapt ASCE and ASME guidelines. Earthquake resistant designs in Korea review braces only. Hence, various analyses under load conditions, such as the internal pressure of a pipe, force exerted by a continuous load, and an earthquake, are required to ensure reliability. An engineering earthquake-resistance analysis showed that tree type pipe networks are less stable than grid and loop type pipe networks. A comparison of earthquake-resistance analysis based on stress and strain revealed that strain analysis exhibited a conservative result value in the range of over-stress. Therefore, for the earthquake-resistance analysis of pipes, it is rational that engineers perform analysis to achieve the required standards through engineering analysis rather than uniform calculations, which should also be analyzed considering various analysis conditions.

Leak Detection in a Water Pipe Network Using the Principal Component Analysis (주성분 분석을 이용한 상수도 관망의 누수감지)

  • Park, Suwan;Ha, Jaehong;Kim, Kimin
    • Proceedings of the Korea Water Resources Association Conference
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    • 2018.05a
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    • pp.276-276
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    • 2018
  • In this paper the potential of the Principle Component Analysis(PCA) technique that can be used to detect leaks in water pipe network blocks was evaluated. For this purpose the PCA was conducted to evaluate the relevance of the calculated outliers of a PCA model utilizing the recorded pipe flows and the recorded pipe leak incidents of a case study water distribution system. The PCA technique was enhanced by applying the computational algorithms developed in this study. The algorithms were designed to extract a partial set of flow data from the original 24 hour flow data so that the variability of the flows in the determined partial data set are minimal. The relevance of the calculated outliers of a PCA model and the recorded pipe leak incidents was analyzed. The results showed that the effectiveness of detecting leaks may improve by applying the developed algorithm. However, the analysis suggested that further development on the algorithm is needed to enhance the applicability of the PCA in detecting leaks in real-world water pipe networks.

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Maintenance Priority Determination Method considering the Shape and Property Information of Roads and Pipe Networks (도로, 관망의 형상 및 속성정보를 고려한 유지보수 우선순위 결정 방법)

  • Jang, Young-Hoon;Park, Wonyoung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.279-280
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    • 2023
  • Due to the deterioration of infrastructure, the importance of maintenance is continuously increasing. Therefore, an integrated maintenance method for various facilities is required. In this study, a maintenance priority determination method for integrated maintenance of roads and pipe network facilities was developed. It is possible to analyze attribute information by using GIS data of roads and pipe networks, and shape information can be used. This information is derived as quantitative figures for determining maintenance priorities. In the future, it is expected that facility maintenance can be further advanced in connection with maintenance method and quantity information for each facility.

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Evaluation of Risk Factors to Detect Anomaly in Water Supply Networks Based on the PROMETHEE and ANP (상수도관망의 이상징후 판정을 위한 위험요소 평가 - PROMETHEE와 ANP 기법 중심으로)

  • Hong, Sung-Jun;Lee, Yong-Dae;Kim, Sheung-Kown;Kim, Joong-Hoon
    • Journal of Korea Water Resources Association
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    • v.39 no.1 s.162
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    • pp.35-46
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    • 2006
  • In this study, we proposed a layout of the integrated decision support system in order to prevent the contamination and to manage risk in water supply networks for safe and smooth water supply. We evaluated the priority of risk factors to detect anomaly in water supply networks using PROMETHEE and ANP techniques, which are applied to various Multi-Criteria Decision Making area in Europe and America. To develop the model, we selected pH, residual chlorine concentration, discharge, hydraulic pressure, electrical conductivity, turbidity, block leakage and water temperature as the key data item. We also chose pipe corrosion, pipe burst and water pollution in pipe as the criteria and then we present the results of PROMETHEE and ANP analysis. The evaluation results of the priority of risk factors in water supply networks will provide basic data to establish a contingency plan for accidents so that we can establish the specific emergency response procedures.