leakage locating Articles

  • Specifying allowable leakage rates

    Introduction Allowable Leakage Rates or Action Leakage Rates (ALRs) are specified for installed geomembranes to quantify the maximum allowable liquid leakage. If the ALR is exceeded, corrective action must be taken to reduce the leakage rate below the set limit. To lower the leakage, the holes in the geomembrane are located and repaired. In some cases, the ALR is set so low that, ...

  • King George V Willowstick Survey - Case Study

    Atkins used Willowstick to position diaphragm wall and stop leakage through 6.2km long embankment dam With over 6km of embankment locating the exact leakage paths and hence minimising the required diaphragm wall length was made possible with the use of Willowstick. Willowstick brought confidence in the correct location of the diaphragm wall and major cost savings to the client. ...


    By Willowstick Technologies LLC

  • Samanalawewa Dam Willowstick Survey - Case Study

    Willowstick rapidly located leak at dam troubled for decades After 18 years of unsuccessful remediation work costing tens of millions of dollars Willowstick identified the exact leakage pathway in less than a month. This enabled the client to carry out targeted remediation works at a fraction of the original cost. The leakage path identified by Willowstick was significantly ...


    By Willowstick Technologies LLC

  • Shon Sheffrey Dam Willowstick Survey - Case Study

    Atkins used Willowstick to design targeted grouting and successfully stop leakage through earth embankment dam Atkins was commissioned by Welsh Water to reduce leakage at earth dam nicknamed “the sieve”. Client admitted they would need to come up with a new name after Atkins successfully located and stopped all leakage pathways with a Willowstick assisted grouting programme. ...


    By Willowstick Technologies LLC

  • Locating Geomembrane Liner Leaks under Waste in a Landfill

    Abstract An Electrical Leak Imaging and Monitoring (ELIM SM) survey was used to locate leaks under 2.5 meters of stabilized waste in an active geomembrane-Iined landfill. The landfill is lined with two 2-mm thick HDPE geomembranes that are separated by a geonet drainage layer. The primary liner is covered with 600 mm of drainage sand and 2.5 meters of stabilized waste for a total cover ...

  • Leakage from drill pipe casing subject to shear deformation

    The possibility of fluids leaking from a pressurised drill pipe casing subject to shear deformation caused by various events, including geological activity (such as seismic activity or deformations associated with subsidence related to excavation and construction) in the vicinity of the bore hole, is investigated. An experimental laboratory scoping investigation has been conducted to determine ...


    By Inderscience Publishers

  • Numerical modelling of the environmental impact of landfill leachate leakage on groundwater quality – a field application

    Waste disposal facilities are mainly responsible for the gradual quality degradation of subsurface freshwater reservoirs. The main objective of this work is to identify the groundwater contamination risk due to potential leachate leakage and seepage beneath the municipal landfill of the City of Patras in Greece. A groundwater and leachate mass transport model of the underlying aquifer was ...


    By Springer

  • Wimbleball Dam Willowstick Survey - Case Study

    Atkins use Willowstick to significantly reduce cost of remediation scheme at concrete dam The cost of a proposed leakage remediation scheme at Wimbleball dam was dramatically reduced after Willowstick identified different leakage path than previously assumed. Leaking grout “curtain” suspected During construction a grout “curtain” was ...


    By Willowstick Technologies LLC

  • Pressure Control for Leakage Minimisation in Water Distribution Systems Management

    A model to support decision systems regarding the quantification, location and opening adjustment of control valves in a network system, with the main objective to minimise pressures and consequently leakage levels is developed. This research work aims at a solution that allows simultaneously optimising the number of valves and its location, as well as valves opening adjustments for simulation in ...


    By Springer

  • Case study - Hetch Hetchy Water and Power Project (SFPUC)

    Service: Magnetic Flux Leakage (MFL) Client: San Francisco Public Utilities Commission (SFPUC) Project Date: 2007 to 2010 Location: California, USA Type of Pipeline: Water Transmission Main Diameter: 56-inch to 72-inch Pipe Material: Steel San Francisco Public Utilities Commission (SFPUC) operates three parallel cement mortar-lined steel pipelines 47.5 miles long, ...

  • Headrace Tunnel—Leak Detection - Case Study

    This hydropower plant in Central America is a vital part of its country’s infrastructure, supplying 18% of the country’s power. THE PROBLEM: HEADRACE TUNNEL LEAKAGE Our client observed their 4km headrace tunnel had major leakage problems. In an attempt to better understand the problem, the client underwent several inspections which ultimately proved unsuccessful. ...


    By Willowstick Technologies LLC

  • Increasing efficiency with permanent leakage monitoring - Case study

    Abstract In this paper information from Water Authorities in the USA, Europe, Middle East and Australia that have purchased permanent monitoring leak detection equipment is reviewed and the findings are presented in a structured format that covers the following: Justification for permanent monitoring Evaluating the different product offerings Selecting the ...


    By Gutermann AG

  • Global: Increasing Efficiency with Permanent Leakage Monitoring - Case Study

    Abstract In this paper information from Water Authorities in the USA, Europe, Middle East and Australia that have purchased permanent monitoring leak detection equipment is reviewed and the findings are presented in a structured format that covers the following: Justification for permanent monitoring Evaluating the different product offerings Selecting ...


    By Gutermann AG

  • Multiple-fault detection in water pipelines using transient-based time-frequency analysis

    Pipe faults, such as leakage and blockage, commonly exist in water pipeline systems. It is essential to identify and fix these failures appropriately in order to reduce the risk of water pollution and enhance the security of water supply. Recently, transient-based detection methods have been developed for their advantages of non-intrusion, efficiency and economics compared to traditional ...


    By IWA Publishing

  • Dust monitoring with AirSafe - Case Study

    Application A producer of building materials manufactures adhesives for fl oor tiles. As a part of the production process powder is transported through pipes from one production site to another. The pipes lead through production facilities and rooms which are diffi cult to control because of their vast extent. In the past several leakages in the pipework caused the discharge ...


    By ENVEA

  • Intrusion and leakage in drinking systems induced by pressure variation

    Pathogen intrusion is a phenomenon that can cause a serious pollution problem in drinking systems. The paper describes the entry of external fluids through pipe defects caused by a pressure drop. This situation is especially important during hydraulic pressure variations. Pressure variations that can cause intrusion are analyzed in this paper. Three cases of pressure transients are modeled with ...


    By IWA Publishing

  • Application of genetic programming to modeling pipe failures in water distribution systems

    The water loss from a water distribution system is a serious problem for many cities, which incurs enormous economic and social loss. However, the economic and human resource costs to exactly locate the leakage are extraordinarily high. Thus, reliable and robust pipe failure models are demanded to assess a pipe's propensity to fail. Beijing City was selected as the case study area and the pipe ...


    By IWA Publishing

  • Continuous dust monitoring with AirSafe - Case Study

    Application A producer of dry mortar needs dry sand and trass for the production process. Both materials are dried in a hot gas heater at a temperature of 500 °C before they are admixed. The hot gas heater uses brown coal dust as combustion material. The brown coal dust, which is stored in a silo, is transported via a rotary valve in free fall to a distribution plate. From there it ...


    By ENVEA

  • Leak detection by inverse transient analysis in an experimental PVC pipe system

    Leakage reduction in water supply systems and distribution networks has been an increasingly important issue in the water industry since leaks and ruptures result in major physical and economic losses. Hydraulic transient solvers can be used in the system operational diagnosis, namely for leak detection purposes, due to their capability to describe the dynamic behaviour of the systems and to ...


    By IWA Publishing

  • Germany/Eislingen - Permanent leakage monitoring is the fastest way to reduce leakage - Case study

    The town of Eislingen in Southern Germany has practiced Active Leakage Control for many years with a team of two equipped with a ground microphone and correlator who drive around in a van searching for leaks. As many of the pipes are one hundred years they had a good success rate often finding leaks. With two hundred and forty kilometers in the network, there is a large area for one team to cover ...


    By Gutermann AG

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