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Performance-based Leakage Reduction and Management Services SAWACO Zone 1 Training and Transfer of Technology.

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Presentation on theme: "Performance-based Leakage Reduction and Management Services SAWACO Zone 1 Training and Transfer of Technology."— Presentation transcript:

1 Performance-based Leakage Reduction and Management Services SAWACO Zone 1 Training and Transfer of Technology

2 22 Outline  Classroom Training Modules  Field Training Modules

3 33 Outline  Classroom Training Modules Module 1 DMA Design Module 2 DMA Construction and Commissioning Module 3 Active Leakage Control Module 4 Pressure Management

4 44 Classroom Training Module 1 DMA Design  Definition of District Metering Area (DMA) is a world-wide accepted tool to operate and manage a network area wherein hydraulic boundary is defined by a system of Isolation Valves (IV) an flow Meters a discrete area of a water distribution network. It is usually created by closing boundary valves so that it remains flexible to changing demands. However, a DMA can also be created by permanently disconnecting pipes to neighboring areas. Water flowing into and out of the DMA is metered and flows are periodically analyzed in order to monitor the level of leakage

5 55 Classroom Training Module 1 DMA Design  Definition of District Metering Area (DMA) has water service connections ranging from 500-3,000 can be categorized into the following types:  Single inlet DMAs  Multiple inlet DMAs  Cascading DMAs

6 66 Classroom Training Module 1 DMA Design  General Guidelines in DMA Design DMAs should not include trunk mains or storage tanks Each DMA should preferably be supplied through a single, metered supply point DMA boundaries should be created by closing boundary valves Variations in ground elevation should be minimal across the DMA The types of consumers and their respective water supply requirements should be assessed

7 77 Classroom Training Module 1 DMA Design  General Guidelines in DMA Design Legal regulations governing minimum pressures, local constraints due to topography and height of buildings as well as fire fighting requirements have to be respected Closing boundary valves to create DMAs will increase the number of dead-end pipes Pressure management plays a key role in leakage management

8 88 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Planning and Prioritization Field Survey Preliminary Design Hydraulic Simulation Draft ReportFinal report

9 99 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Planning and Prioritization Preliminary design by Manila Water design team in coordination with MWH network modelling team Prioritization by highest leakage potential Manila Water prioritization was initially based on the following: Pipe material Pipe age Number of leak occurrences

10 10 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Field Survey Data gathered during site investigation: Location and status of existing valves, fire hydrants and blow-offs. Big consumption customers Pressure Road classification Traffic

11 11 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Preliminary Design Preliminary design of 119 DMAs in the Feasibility Study done in 2005 One line meter per DMA with a range of service connections DMAs per District District 1 – 24 DMAs District 3 – 29 DMAs District 5 – 28 DMAs District 10 – 38 DMAs

12 12 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Hydraulic Modelling MWH conducted the hydraulic simulation based on the initial design submitted by MWC The term hydraulic network model describes the use of a mathematical representation of a real water supply system Hydraulic network models are used to simulate the behavior of existing or planned systems under a wide range of conditions without disrupting service to the customer

13 13 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Draft Report The preliminary DMA design report is based on Decree 209/2004 (Quality Managements of Construction Works) which contains the following: DMA Description DMA Information Quantity of work Applicable Standards DMA Design Drawings Work Schedule Work Methodology Site Regulation and Safety

14 14 Classroom Training Module 1 DMA Design  Planning, Design and Engineering Final Report Approval of the preliminary report is sought in order to produce the 10 copies of final report Combination of DMAs are done in order to pass the requirements of the hydraulic simulation and other design criteria

15 15 Classroom Training Module 2 DMA Construction and Commissioning Permit Acquisition Civil Works Commissioning Works

16 16 Classroom Training Module 2 DMA Construction and Commissioning Permit Acquisition Preparation of Drawings with underground obstructions Process of Issuance of UTM Agreement Submission of DOT Agreement Submission of DOT Permit Issuance of Permit

17 17 Classroom Training Module 2 DMA Construction and Commissioning  Permit Acquisition

18 18 Classroom Training Module 2 DMA Construction and Commissioning Civil Works Line Meter Assemblies Isolation Valves Looping and Interconnection Activities Pipelaying Activities Fire Hydrants

19 19 Classroom Training Module 2 DMA Construction and Commissioning  Civil Works Line Meter Assembly  Electromagnetic Flow Meter  Pressure Reducing Valve  Strainer  By Pass Connection  Panel Box

20 20 Classroom Training Module 2 DMA Construction and Commissioning Commissioning Works Water Adequacy Test Zero Pressure Test Baseline Measurement Baseline Report

21 21 Classroom Training Module 2 DMA Construction and Commissioning  Water Adequacy Test Water Adequacy Test will be conducted to ensure sufficiency of water supply within the isolated DMA despite of having only a single supply point WAT starts with the measurement of pressure at benchmark points within and outside of the DMA prior to and after closure of all isolation valves It is important that during the conduct of Water Adequacy Tests (WAT), all service connections covered by a particular DMA is identified, verified and tagged

22 22 Classroom Training Module 2 DMA Construction and Commissioning  Water Adequacy Test Steps 1.Identify all boundary valves. 2.Determine if the valves are operable, if not, replace the boundary valve. 3.Monitor the pressure before and after isolation inside and outside the DMA 4.Before closing any valve, install pressure gage in the hydrant inside the DMA 5.Close the boundary valve one by one 6.Continue closing all boundary valves 7.Compare the pressure before and after the isolation 8.If there is a big pressure drop, the DMA needs to be redesigned or introduce and additional supply usually by opening the critical boundary valve

23 23 Classroom Training Module 2 DMA Construction and Commissioning  Water Adequacy Test mm CIP 200mm 150mm 100mm 150mm 100mm 75mm 100mm 75mm M Check Pressure w/in & outside DMA –Close all Isolation Valves –Let water pass thru District Meter (inflow &outflow ). –If water is adequate within & outside the DMA, let all Isolation Valves be remained closed as supply will now pass through the District Meter.

24 24 Classroom Training Module 2 DMA Construction and Commissioning  Zero Pressure Test ZPT is conducted following the Water Adequacy Test to ensure the tightness of isolations In principle, once all the isolation valves are closed including the inflow/s, pressure inside the DMA should drop to zero until no water comes out of the monitoring point/s The test is normally done during off-peak hours (1AM to 4AM), when demand is at its lowest and pressure is theoretically at its peak

25 25 Classroom Training Module 2 DMA Construction and Commissioning  Zero Pressure Test Steps 1.Inform the customers about the schedule of the water interruption. 2.Identify critical point, usually the hydrant in the lowest elevation of the DMA. 3.Closed all the supply points 4.Open the hydrant to check if there will be no water (preferably the hydrant in the lowest elevation inside the DMA). 5.If there is still water after several minutes, check all the boundary valves if they are tightly closed. 6.If all the boundary valves are fully closed and still there is water in the monitoring point, then there is unknown inflow inside the DMA. 7.Check where the pressure is the highest as the unknown inflow may be in that area. 8.Check old maps for old lines. 9.Use GPR, pipe locator and other equipment to find old lines. 10.Conduct step testing to localize the location of unknown lines.

26 26 Classroom Training Module 2 DMA Construction and Commissioning  Water Adequacy Test

27 27 Classroom Training Module 2 DMA Construction and Commissioning  Baseline Measurement If Water Adequacy and Zero Pressure Test are successful, the next step is to conduct the baseline measurement Baseline Measurement is done to determine the baseline NRW of a particular DMA Baseline measurement is usually done on the period of 7 days to capture one complete cycle of water consumption pattern in the DMA

28 28 Classroom Training Module 2 DMA Construction and Commissioning  Baseline Measurement Steps 1.Identify all the water service connection inside the DMA based on the design boundary. 2.Identify and replace all defective water meters before baseline measurement to increase the accuracy of data. 3.Carry out the baseline measurement. Read all DMA meters (inflow and outflow) on the 1st and 7th day, ideally at the same time. Compute Qi in m3/day. 4.Read all customer meters on day 1 and 7 of the measurement. First and second reading of a specific meter should be at approximately the same hour of the day. 5.Calculate the total metered consumption of all customers in the DMA by utilizing the 90 day billing average from SAWACO or JSC and calculate the daily average QM (m3/d). 6.Calculate baseline leakage

29 29 Classroom Training Module 2 DMA Construction and Commissioning  Baseline Measurement Formula L b = Q i – Q m Where L b = Leakage during baseline in m 3 /day Q i = DMA inflow in m 3 /day Q m = metered consumption (billed volume) in m 3 /day

30 30 Classroom Training Module 2 DMA Construction and Commissioning  Data Logging and Data Transfer

31 31 Classroom Training Module 3 Active Leakage Control Analysis and Control Leak location/detection Leak repair Monitoring and Measurement

32 32 Classroom Training Module 3 Active Leakage Control Water Losses due to Leakage  Four Pillars of Physical Loss Management

33 33 Classroom Training Module 3 Active Leakage Control Analysis and Control A proactive strategy to reduce water loss through detection of nonvisible leaks Involves the regular survey of the water network using one or more techniques in detecting leaks in water mains Performing night flow measurements on a regular basis to detect new leaks as soon as possible

34 34 Classroom Training Module 3 Active Leakage Control Leak location /detection Leak Detection or localizing by means of a step test or acoustic logging survey enables the leakage engineer to narrow down the location of the leak or burst to an individual road or length of main Next activity for the leakage engineer is to precisely locate or pinpoint the position of the leak and mark the point clearly on the ground surface where the repair teams will have to excavate

35 35 Classroom Training Module 3 Active Leakage Control  Step Testing Step testing is the technique whereby a leak or leaks are detected by making temporary successive valve closures to reduce the size of a DMA The valves are closed for a short duration whilst simultaneously measurements of the rate of flow are being made

36 36 Classroom Training Module 3 Active Leakage Control  Step Testing Procedure Survey and check the operability of all the existing valves inside the DMA. Plan the sequence of step test segment carefully utilizing the information gather from the valve survey. Schedule the activity during minimum demand usually 12:00 – 4:00 am. Inform the customers in advance regarding the Step test activity. Start closing the valves from the segment farthest from the line meter. Record valve details (location and no. of turns) and time of closure; Read the transmitter (totalizer and instantaneous flow) after every valve closure or set data logging every minute for more comprehensive data.

37 37 Classroom Training Module 3 Active Leakage Control  Step Testing Procedure Continue the step test until all segment are completed, the last segment being the area supplied by the line meter. If possible, check if there is no water in each segment. Open the valves slowly in reverse order. Do flushing activity to avoid dirty water complaint. Analyze the step test data to determine the segment with the highest possible leakage.

38 38 Classroom Training Module 3 Active Leakage Control  Step Testing

39 39 Classroom Training Module 3 Active Leakage Control  Step Testing

40 40 Classroom Training Module 3 Active Leakage Control  Equipment Leak Noise Loggers Ground Microphone Leak Noise Correlators GPR

41 41 Classroom Training Module 3 Active Leakage Control  Leaks commonly occur on: Service Connection  Service pipe  Tapping  House meter assembly Mainline  Main pipe  Joints Valve

42 42 Classroom Training Module 4 Pressure Management  Definition of Pressure Management the practice of managing system pressures to the optimum levels of service ensuring sufficient and efficient supply to legitimate uses and consumers, while reducing unnecessary excess pressures, eliminating transients and faulty level controls all of which cause the distribution system to leak unnecessarily

43 43 Classroom Training Module 4 Pressure Management  Zone 1 Experience the overall aim is to ensure that the pressure during the day is not significantly lower that the pressure at night. To keep the pressure within optimal levels inside the DMA, PRVs previously installed with the rest of the flow meter set assembly will be operated

44 44 Classroom Training Module 4 Pressure Management  Pressure Reducing Valve (PRV) maintains the optimum pressure in the network at all times, but automatically compensates for the reduced flow following the repair of the leaks whilst maintaining the original operating pressures in the DMA

45 45 Classroom Training Module 4 Pressure Management  Pressure Management and Modulation

46 46 Classroom Training Module 4 Pressure Management  Pressure Management and Modulation Modulation Location  Local point pressure modulation  Critical point pressure modulation Modulation Type  Fixed outlet pressure modulation  Time-based pressure modulation  Flow-based pressure modulation

47 47 Outline  Field Training Modules Water Adequacy Test Zero Pressure Test Step-Testing Use of leak noise correlator Use of leak pen in leak detection Use of ground microphone for leak detection Line meter and PRV operation PMAC Familiarization/ Data Center

48 48 Xin Cám Ơ n!

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