• Title/Summary/Keyword: water pipe

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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.

A Methodology to Quantifying Benefit for Implementing Smart-Pipe to Lifeline Systems (라이프라인의 Smart-Pipe 시스템 도입을 위한 이익정량화 방안)

  • Jun, Hwan-Don;Kim, Joong-Hoon;Cho, Moon-Soo;Baek, Chun-Woo;Yoo, Do-Guen
    • Journal of the Korean Society of Hazard Mitigation
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    • v.8 no.4
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    • pp.61-66
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    • 2008
  • As the water distribution system which is one of the critical lifeline system is deteriorated and pipe failures occur frequently, the more efficient pipe monitoring system becomes a critical issue in the water industry. One of the pipe monitoring systems is called "Smart-pipe System" which is permanent, comprehensive and an automated SIM (Structural Integrity Monitoring) system and has superiorities to existing monitoring system. To implement a smart-pipe system on a water distribution system, assessment of its indirect benefit obtaining from smartpipe such as the ratio of preventing water main failures must be preceded. However, only some researches on this field have been performed. In this paper, the concept of smart-pipe system is compared with the current monitoring systems for a water distribution system, and a method to quantify its benefit using the inconvenient time for customers is suggested. The suggested method was applied to a real water distribution system to estimate its applicability and benefit.

Numerical simulation on the coupled chemo-mechanical damage of underground concrete pipe

  • Xiang-nan Li;Xiao-bao Zuo;Yu-xiao Zou;Yu-juan Tang
    • Structural Engineering and Mechanics
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    • v.86 no.6
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    • pp.779-791
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    • 2023
  • Long-termly used in water supply, an underground concrete pipe is easily subjected to the coupled action of pressure loading and flowing water, which can cause the chemo-mechanical damage of the pipe, resulting in its premature failure and lifetime reduction. Based on the leaching characteristics and damage mechanism of concrete pipe, this paper proposes a coupled chemo-mechanical damage and failure model of underground concrete pipe for water supply, including a calcium leaching model, mechanical damage equation and a failure criterion. By using the model, a numerical simulation is performed to analyze the failure process of underground concrete pipe, such as the time-varying calcium concentration in concrete, the thickness variation of pipe wall, the evolution of chemo-mechanical damage, the distribution of concrete stress on the pipe and the lifetime of the pipe. Results show that, the failure of the pipe is a coupled chemo-mechanical damage process companied with calcium leaching. During its damage and failure, the concentrations of calcium phase in concrete decrease obviously with the time, and it can cause an increase in the chemo-mechanical damage of the pipe, while the leaching and abrasion induced by flowing water can lead to the boundary movement and wall thickness reduction of the pipe, and it results in the stress redistribution on the pipe section, a premature failure and lifetime reduction of the pipe.

The Development of Corrosion Standard System of Water and Wastewater in Soil Environment (상·하수도 배관재의 토양환경에서의 부식표준시스템 개발)

  • Park, Kyeong-Dong;Shin, Yeong-Jin;Lee, Ju-Yeong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.5 no.4
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    • pp.7-12
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    • 2006
  • Galvanized steel pipe, copper pipe and stainless steel pipe, which is being used in waterworks piping materials. In case of galvanized steel pipe, the precipitation of a product is being generated due to the pollution of the tap water, a white water phenomenon, and various corrosion reaction because a zinc ion is melted by tap water. And in case of a cupper pipe, many problems which is harm in sanitation appeared because of a inflow of harmfulness substance by a frequent accident of a water leakage. So, to prevent these problems, it is substituted for stainless steel pipe. However, those problems is still occurring because of badness of welding, a problem of a water leakage in connection part, and a increment of construction expenses. Therefore, this research has examined the laying period according to each piping thickness and a corrosion shape according to each laying depth after laying in various soils(sandy loam, loamy, clay loam, clay) using galvanized steel pipe, copper pipe, and stainless steel pipe. That is, we has studied the data which is necessary for a rational method of preserving the quality of water by examining the corrosion properties of piping materials in the soil environment which waterworks piping materials is being used.

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Effect of Refrigerant Pipe Length on Sea Water Cooling System Performance (해수냉각시스템 성능에 미치는 냉매배관길이의 영향)

  • Yun, Jeong-In;Jo, Yeong-Je
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.34 no.3
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    • pp.346-351
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    • 1998
  • The purpose of this study is analyzing the performance of sea water cooling system under various refrigerant pipe length. In sea water cooling system, the increase of refrigerant pipe length cause increases of pressure drops. These pressure drops cause fresh gas in liquid pipe and increase specific volume in gas pipe outlet, so sea water cooling system capacity is decreased by decrease of refrigerant mass flow rate. Sea water cooling system capacity in refrigerant pipe length 70m is decreased more than 30% when compared with pipe length 10m and the decrease of the coefficient of performance is nearly 20%.

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The Regulations and Guidelines for Management of Corrosive Water and Pipe Corrosion in Drinking Water Distribution System in North America (상수원 관망 부식 제어를 위한 부식성 수질 관리: 북미지역 관리 사례 및 국외 현황)

  • Kim, Minhee;Hyun, Seunghun;Lee, Won-Seok;Loretta, Y. Li
    • Journal of Korean Society on Water Environment
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    • v.33 no.3
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    • pp.359-369
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    • 2017
  • Water distribution systems supply drinking water to consumers' taps. Internal corrosion of metallic pipe used in drinking water distribution systems has reduced water quality and led to increased levels of toxic heavy metals such as lead, copper and nickel. These problems have been experienced to varying degrees by water utilities in many countries. North America has successfully managed and controlled pipe corrosion and corrosive water in water distribution system based on various policies, regulations and rules. Practical and engineering guidelines for evaluation of pipe corrosion and determination of treatment options are also provided to assist drinking water supplies. In addition, the corrosion mechanism in water distribution systems, such as the complex effects of physical and chemical parameters on the corrosion pipes has been improved to accurately predict corrosion rates of metallic pipes in actual water distribution systems. This paper reviews various regulations, policy statement, and treatment produces on controlling corrosion in drinking water distribution systems in US and Canada and then offers suggestion for management of corrosive water and pipe corrosion in drinking water distribution system in Korea.

The developing optimum maintenance cost model for water pipe network by waterworks business characteristics (수도사업자의 경영환경을 고려한 상수도관망 적정 유지관리비 산정 모델 개발 연구)

  • Kim, Kibum;Kim, Changhwan;Shin, Hwisu;Seo, Jeewon;Hyung, Jinseok;Koo, Jayong
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.1
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    • pp.51-62
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    • 2017
  • For the asset management of a water pipe network, it would be necessary to understand the extent of the maintenance cost required for the water pipe network for the future. This study would develop a method to draw the optimum cost required for the maintenance of the water pipe network in waterworks facilities to maintain the aim revenue water ratio and to achieve the target revenue water ratio, considering the water service providers' waterworks condition and revenue water ratio comprehensively. This study conducted a survey with 96 water service providers as of the early 2015 and developed models to estimate the optimum maintenance cost of the water pipe network, considering the characteristics of the water service providers. Since the correlation coefficient of all the developed models was higher than 0.95, it turned out that it had significant reliability, which was statistically significant. As a result of applying the developed models to the actual water service providers, it was drawn that increasing revenue water ratio to more than a certain level can reduce the maintenance cost of the water pipe network by a great deal. In other words, it is judged that it would be the most efficient to secure the reliability of waterworks management by increasing the short-term revenue water ratio to more than a certain level and gradually increase the revenue water ratio from the long-term perspective. It is expected that the proposed methodology proposed in this study and the results of the study will be used as a basic research for planning the maintenance of water pipe network or establishing a plan for waterworks facilities asset management.

Perceptions of Turkish University Students about the Effects of Water Pipe Smoking on Health

  • Sahin, Sevil;Cinar, Nursan
    • Asian Pacific Journal of Cancer Prevention
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    • v.16 no.11
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    • pp.4615-4621
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    • 2015
  • Background: The popularity of the water pipe, also referred to as hookah, narghile, shisha or hubble-bubble, has increased tremendously during the past few decades. This study was conducted to determine student water pipe smoking status and perceptions about the effects of water pipe smoking on health in a state university in Ankara. Materials and Methods: This cross-sectional study was conducted between September 2014 and January 2015. The data were collected with a questionnaire and "The Scale of Perception about the Effects of Water Pipe Smoking on Health". The data obtained were evaluated in IBM SPSS (version 20.0) statistical package program in computer. One-way analysis of variance (ANOVA) was used for the analyses by checking homogeneity of variances and Student's t-test. Values of p<0.05 were considered statistically significant. Results: The total mean score obtained by young people who took part in the study was determined as ($\bar{X}=65.20{\pm}1.25$, min=33, max=75). Upon comparison of the total mean scores obtained by young people from the Scale of Perception about the effects of water pipe smoking on health and gender variable, the scores obtained by the females students were higher than those of the male students with a statistically significant difference (t=7.525, p<0.05). A statistically significant difference was observed between the total mean scores obtained by young people with cigarette and water pipe smoking status (for each, t=-3.731, p<0.05; t=-13.987, p<0.05). Conclusions: In conclusion, university students have wrong knowledge on the dangers of water pipe smoking. There was a high prevalence of using water pipes among university students. Gender significantly affected the perceptions about the effect of water pipe smoking on health in our sample.

Development and Applications of a Methodology and Computer Algorithms for Long-term Management of Water Distribution Pipe Systems (상수도 배수관로 시스템의 장기적 유지관리를 위한 방법론과 컴퓨터 알고리즘의 개발 및 적용)

  • Park, Suwan
    • Journal of Korean Society on Water Environment
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    • v.23 no.3
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    • pp.356-366
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    • 2007
  • In this paper a methodology is developed to prioritize replacement of water distribution pipes according to the economical efficiency of replacement and assess the long-term effects of water main replacement policies on water distribution systems. The methodology is implemented with MATLAB to develop a computer algorithm which is used to apply the methodology to a case study water distribution system. A pipe break prediction model is used to estimate future costs of pipe repair and replacement, and the economically optimal replacement time of a pipe is estimated by obtaining the time at which the present worth of the total costs of repair and replacement is minimum. The equation for estimating the present worth of the total cost is modified to reflect the fact that a pipe can be replaced in between of failure events. The results of the analyses show that about 9.5% of the pipes in the case study system is required to be replaced within the planning horizon. Analyses of the yearly pipe replacement requirements for the case study system are provided along with the compositions of the replacement. The effects of water main replacement policies, for which yearly replacement length scenario and yearly replacement budget scenario are used, during a planning horizon are simulated in terms of the predicted number of pipe failures and the saved repair costs.

A study on optimal planning of risk reduction for water suspension in water pipe system using fault tree analysis (결함트리분석을 이용한 상수관망 단수 리스크 저감 최적 방안 연구)

  • Choi, Tae Ho;Kim, A Ri;Kim, Min Cheol;Koo, Ja Yong
    • Journal of Korean Society of Water and Wastewater
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    • v.28 no.6
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    • pp.699-711
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    • 2014
  • This study was carried out to analyze water suspension in the water supply system through fault tree analysis. And quantitative factors was evaluated to minimize water suspension. Consequently the aim of this study is to build optimal planning by analyzing scenarios for water suspension. Accordingly the fault tree model makes it possible to estimate risks for water suspension, current risks is $92.23m^3/day$. The result of scenario analysis by pipe replacement, risks for water suspension was reduced $7.02m^3/day$ when replacing WD4 pipe. As a result of scenario analysis by water district connections, the amount of risk reduction is maximized when it is connecting to network pipe of D Zone. Therefore, connecting to network pipe for D Zone would be optimal to reduce risk for water suspension.