• 한국수자원학회논문집
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• 제50권9호
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• pp.609-616
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• 2017

본 연구에서는 상수관망의 최적 수압모니터링 지점선정 알고리즘과 역추적 계산법을 이용한 누수탐지 알고리즘을 개발하였고 파일럿 플랜트에서 실험을 통해 검증하였다. 먼저 누수탐지를 위한 최적의 모니터링 지점선정을 선정하고 압력계를 설치하여 누수로 인한 압력변위를 측정하였다. 누수탐지를 위한 역추적계산법의 검증을 위하여 누수탐지를 수행하였고 파일럿플랜트에서 실제 재현된 누수의 지점과 누수량을 정확하게 산정하였다. 누수량을 $0.0005m^3/s$로부터 $0.0018m^3/s$까지 변화시키며 누수를 재현하였고 누수지점에 근접한 장소를 찾는데 성공하였다. 본 연구에서는 실험을 통해서 누수탐지기법으로 사용된 역추적계산법이 유효함을 검증할 수 있었다.

• 플랜트 저널
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• 제7권1호
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• pp.56-63
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• 2011

The identifying cause of leakage problems on mechanical seal in a feed water pump of power plant have been difficult because of technical limits of domestic mechanical seal manufacturer and the various conditions of power plants. This paper can get a conclusion through the consideration study and experiment test of mechanical seal characteristics of feed water pump depending on oxygen treatment as follows. The oxygen treatment increase dissolved oxygen and cause a corrosion on the mechanical seal stationary ring composed of antimony as well as leakage problems. For solving leakage problems of seal, to eliminate dissolved oxygen in the cooling water of seal with hydrazine injection can prevent leakage problems of mechanical seal in feed water pump.

• 상하수도학회지
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• 제37권6호
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• pp.311-324
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• 2023

As an advanced study on the method of calculating the target revenue water ratio of local waterworks through the leakage component analysis method proposed by Kim et al. (2022), this study developed a model to calculate the achievable revenue water ratio within the specified project cost, the required project cost to achieve the specified target revenue water ratio, and the economically appropriate target revenue water ratio level by considering the leakage reduction cost and leakage reduction benefit for each revenue water ratio improvement strategy, and conducted an applicability evaluation of the developed model using actual field data. The procedure for calculating the target revenue water ratio of local waterworks considering economics proposed in this study consists of three stages: physical data linkage model construction, leakage component analysis, and economic analysis, and the applicability was evaluated for Zone H with branch type and the Zone M network type. As a result of the application, it was calculated that approximately 32.5 billion won would be required to achieve the target revenue water ratio of 70% in the Zone H, and approximately KRW 10.5 billion would be required to achieve the target revenue water ratio of 75% in the Zone M. If the business scale of Zones H and M was corrected to 10,000 m³/day of water usage, the required project cost for a 1% improvement in the revenue water ratio of Zone H was calculated to be 0.7642 billion won and 0.4715 billion won for Zone M.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 추계 학술논문 발표대회
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• pp.193-194
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• 2018

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using acrylics. As a second study, it is confirmed that leachate can be used as a repair material by considering long time under water stability, elongation range test, fatigue resistance test, tube stability test, damage recovery performance ana temperature stability considering leakage environment for polyacrylate. In addition, this material is applied to Expansion Joint to perform leakage repair, and to verify the effect of repairing leakage by monitoring and visual observation of concrete humidification.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2009년도 학술발표회 초록집
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• pp.260-266
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• 2009

본 연구는 지방상수도 배급수 관망의 유수율을 향상시키기 위하여 수량관리를 위한 블록시스템 구축을 통한 구역화 계량, 누수의 정량화를 위한 야간최소유량 측정을 통한 누수평가지표 및 국제 누수지수ILI(Infrastructure Leakage Index)의 도입, 압력제어를 통한 누수저감 효과분석, 장기적인 계획수립을 위하여 노후수도관의 잔존수명 예측 등 누수를 평가 관리할 수 있는 기술을 개발, 제안하였다. N시 야간최소유량 측정을 통하여 주거지역과 상업지역에서 정량적인 누수평가지표로 관길이당, 급수전당의 허용기준누수량을 산정하였다. 이는 관망정비가 완료된 주거, 상업지역을 각각 대상으로 UK water industry에서 제안한 방법을 이용하여 실측을 통한 야간최소유량을 분석함으로써 유수율을 대신할 수 있는 허용누수량 산정식을 개발하였다. 압력제어를 통한 누수저감효과는 감압변의 설치를 통하여 수행되는데, 사천시 우티 배수구역을 대상으로 압력관리 구역을 4개로 분할하고 감압밸브 3개소, 가압펌프 1개소를 설치하여 압력을 조절한 결과 약 $466\;m^3/day$의 누수를 저감시킬 수 있을 것으로 나타나 압력관리를 통하여 연간 113백만의 비용절감효과가 기대되었다. 노후 상수관로의 부식속도 및 잔존수명 예측 연구에서는 매설년도, 토양 또는 수질특성에 따른 관체의 부식속도를 평가함으로써 잔존두께를 예측할 수 있는 모델을 개발하였으며 또한 부식으로 인한 공식특성에 따른 잔존강도 등을 평가할 수 있는 비선형회귀 모형을 개발, 수도관의 잔존수명예측에 활용하여 장단기 노후관 개대체 계획수립에 활용할 수 있도록 제안하였다. 본 연구의 결과들은 지방상수도의 유수율 제고 및 관망정비사업에 적극적으로 활용할 수 있는 누수평가 및 관리기법을 제안할 수 있을 것으로 기대된다.

• 상하수도학회지
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• 제23권6호
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• pp.871-879
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• 2009

The Korea has high population density, so the precipitation per capita is only one tenth to world average. The water resource in Korea is insufficient. But the leakage in the water distribution system is about 25%, and it is lower than other countries where water utilities are managed well. The pipelines' management also is getting worse because the leakage in the pipelines lower the ground density surrounding pipes. So, managing the leakage in the water distribution system is very important in the view of increasing the water resources and doing the efficient management of the pipeline system. Accordingly this study aimed to conduct a cause-analysis with scientific approaches considering key local factor related to water loss of distribution system and derive better performance indicators which are able to evaluate the real state of water loss management reasonably. Also this research aimed to develop a methodology capable of judging condition of infrastructure of water distribution system.

• 한국정보통신학회논문지
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• 제26권7호
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• pp.963-971
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• 2022

상수도 관망은 국가 수도 시설의 주요한 구성 요소이지만 대부분이 지중에 매립되어 있어 배관의 노후화 정도 및 누수를 파악하기 어려우므로 유지관리 하기가 매우 어렵다. 본 연구에서는 관망에 설치된 다양한 센서 조합을 가정하여, 데이터 조합에 따른 관로 누수 판별 가능성을 검토하기 위하여 선형회귀분석, 뉴로퍼지 등의 인공지능 알고리즘을 통한 유량과 압력 예측을 실시하여 최적 알고리즘을 도출하였다. 공급압력 예측을 통한 누수판별의 경우 뉴로퍼지 알고리즘이 선형회귀분석에 비하여 우수하였다. 누수유량 예측에서는 뉴로퍼지를 이용한 유량예측이 우선 고려되어야 한다. 다만, 유량을 모사하기 힘든 경우에는 선형 알고리즘을 이용한 공급압력 예측이 이루어져야 할 것으로 사료 된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.181-183
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• 2011

This study was carried out about construction management plan to reduce water leakage of underground parking lot in the apartment housing. To minimize effect of upper working load, installation position of jack support and paving with rubble on the top of underground parking lot were studied. By calculation shrinkage strain of underground parking lot scale, water leakage risk in design of level difference was studied. In this study, the basic data about construction management was provided to reduce water leakage of underground parking lot in the apartment housing.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 추계 학술논문 발표대회
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• pp.79-83
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• 2005

In the reinforced concrete structure, Even if speak that water leakage occurrence is no problem to material, there is a lot of reasons construction factor, material damage by behavior structure, properties of matter change by years and water leakage part by environment condition. so, waterproofing technological consideration should be gone ahead. In this research, we will study about stick performance, concrete surface adhesive, damage and blow. we will check all things and test it. The stick expansion type complex of flexible material passed on result of standard. It is conducive to concrete of durability by waterproofing layer performance demobilitation technology on the water leakage structure for solution of problem and repair

• 상하수도학회지
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• 제29권3호
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• pp.395-406
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• 2015

This research carried out an analysis on input cost and leakage reduction effect by leakage reduction method, focusing on the project for establishing an optimal water pipe network management system in the Taebaek region, which has been executed annually since 2009. Based on the result, optimal cost-benefit analysis models for water distribution network rehabilitation project were developed using DEA(data envelopment analysis) and multiple regression analysis, which have been widely utilized for efficiency analysis in public and other projects. DEA and multiple regression analysis were carried out by applying 4 analytical methods involving different ratios and costs. The result showed that the models involving the analytical methods 2 and 4 were of low significance (which therefore were excluded), and only the models involving the analytical methods 1 and 3 were suitable. From the result it was judged that the leakage management method to be executed with the highest priority for the improvement of revenue water ratio was installation of pressure reduction valve, followed by replacement of water distribution pipe, replacement of water supply pipe, and then leakage detection and repair; and that the execution of leakage management methods in this order would be most economical. In addition, replacement of water meter was also shown to be necessary in case there were a large number of defective water meters.