Maynilad NRW Management Program - Iwa-waterloss.org

“Effective Way of Finding Illegal ConnectionsUsing Leak Detection Equipment – Maynilad Experience”Water Loss 2012Rolixto Jodieres Jr.February 26-29, 2012

Maynilad’s ProfileService Area : 540 SQ.KMPopulation : 8 MillionCustomer : 1,005,350Coverage : 91%Employees : 2,025Water Prod : 2,089 MLDBilled Volume : 1,207 MLDCurrent NRW : 42 % - Dec ’11Baseline NRW : 67% - Dec ’07

NRW (%)1997199819992000200120022003200420052006200720082009201020112012Maynilad NRW History80Benpres/SuezMWSSDMCI/MPIC706666 66 66 69 69 69 68 68 66 646060615350484030No reduction in NRW in 10 yrs403/6/2012 3

The Start : 2008• Establishment of Water Balance• Maynilad NRW : 66%• NRW Volume : 1,500 MLD75% Physical Losses25% Commercial Losses• Low service levelLow pressureIntermittent supplyWater quality issues3/6/20124

Battle Against Illegal Connections• Walk-the-line• Tip-for-cash reward• Meter-banking• Detecting illegal connection using leakequipment

Walk-the-line

Tip-for-Cash Reward

Meter-Banking

Detecting Illegal ConnectionUsing Leak Detection Equipment1. Listening stick (electronic or conventional)• Where to apply:o Meter-set-assembly (MSA)o Service pipe connection• Targets bypass connections• Activity is done during peak demand

Detecting Illegal ConnectionUsing Leak Detection Equipment2. Tethered leak detection equipment• Where to apply:• Water main• Targets direct-tapping illegal connections– Activity is done during peak demand

Simple Scenario of Finding Illegal ConnectionUsing Leak Detection EquipmentLegal ConnectionDirect-tapillegalBypassWater Main

How to detect an illegal connection?Using Listening Stick?1. All meters-set-assemblies (MSA) in the target areamust be checked for sounding.2. Use listening stick to listen for water withdrawal.Note: Noise created while the meter is not running isan indication of leak, withdrawal (bypass) or withdrawalof adjacent MSA which shares the same service pipe.3. Upon confirmation of the finding, location ismarked for excavation.

Pros and Cons (Tethered)Pros• Real time information - can stop at a point ofinterest• Can be operated without water interruption• Combined audio & video headCons• Limited by bends, heavy pipe tuberculationand cable length

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Acoustic & Tethered Leak DetectionActual Operation – Sample Case (Valdez St.)

Inspection Still Images FindingsIllegal connection Build-up of debris Service connectionLarge joint Large Debris Main Shot

Video Inspection

Excavation of Marked LocationsLeaking LegalService PipeLegal ServicePipesRepairedService PipeIllegalConnectionsClosed illegalconnections

Excavation of Marked LocationsIllegal connection 1before closingIllegal connection 1after closingIllegal connection 2before closingIllegal connection 2after closingActivity Results:5 direct-tapped illegal connections were closedProject CAPEX Cost : US$ 4,700Repair cost : US$ 1,200SAVINGS : US$ 3,500

Conclusion“Leak detection equipment is not onlyused for addressing real losses but it canalso be use to address apparent losses(illegal connections) with right tool andmethod.”