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In 2012, Johannesburg Water initiated a project to reduce water loss and pipe bursts by servicing pressure reducing valves (PRVs) and re-establishing water management zones. Key statistics showed the benefits of proper pressure management, with 764 PRVs assessed and significant reductions in leakage and consumption. The project also identified challenges like vandalism and budget constraints, and proposed solutions such as advanced pressure management techniques. The way forward includes evaluating existing controllers, maintaining advanced pressure management zones, and optimizing priority PRVs to sustainably reduce water consumption.
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Water Service Forum By Cecil Kekana24 May 2017
Pressure Management as measure to reduce consumption BACKGROUND Johannesburg Water initiated the project in 2012 with the objective of reducing water loss and pipe bursts through the servicing and repair of pressure reducing valves (PRVs) and the re-establishment of existing water management zones. The project involved all 10 JW depots (Avalon, Ennerdale, Hamburg, Klipspruit, Langlaagte, Midrand, Randburg, Southdale, Zandfontein North and Zandfontein South).
OBJECTIVES • Assessment of PRV’s • Servicing of control valves, pilot valves and Strainers • Confirming discreteness of pressure management zones (PMAs) • Measuring pressure and flow before and after to assess the impact of the project. • Identify further water loss reduction using Advanced Pressure Management.
PROJECT BENEFITS & SUMMARY SUMMARY • 764 PRVs assessed • 364 PRV Zones discreteness confirmed • 542 Pilot Valve and Control Circuit Serviced • 259 Strainers cleaned • 27 Advance Pressure Management installations were commissioned BENEFITS • Reduce leakage • Reduction in number of burst pipes • Consumption Reduction • Prolong infrastructure lifespan • Identification of bottlenecks in the system • Sustainable savings
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Financial Requirements For WC/WDM Initiatives • The table below indicates the anticipated budget requirements for the strategy activities (2016/17 budget is approved )
CHALLENGES • Vandalism • Maintaining zone discreetness • Bulk meter deficiencies • Budget constrains • Lack of routine maintenance
WAY FORWARD • ADVANCED PRESSURE MANAGEMENT • Evaluate existing controllers. • Recommend action: Re-set, service or replace controllers. • Selection of appropriate pressure management technique-time based or flow modulation. • Maintaining Advanced Pressure Management zones • Ensuring priority PRVs are operational and set optimally. • Evaluate where new controllers can be considered.