An innovative approach NRW

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Anissa Todd
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1 An innovative approach NRW

2 Pressure Management Speed and Quality of repairs 4 Pillars of Network Management Best Practices Sectorization / Active Leak Control Pipe replacement and rehabilitation

DMA is one of the most recommended techniques to manage NRW in water distribution networks. Objectives: Reduction of water losses (via data analyses to identify leaks and bursts).

4 DMA is one of the most recommended techniques to manage NRW in water distribution networks. Objectives: Reduction of water losses (via data analyses to identify leaks and bursts). Monitoring and control of operational parameters (flow and pressure via SCADA). The Characteristics are: Small engineered isolated zones dividing the water distribution network. Limited number of Inlets and Outlets, controlled and monitored continuously. Estimation or real-time consumption data Billing Analyses / AMI / AMR.

Considerations for Implementation: Existing infrastructure supplying the network (water source, sizes of pipe, and

PERMANENTLY ISOLATING the district boundaries Specific regulations related to water quantity and quality, including

Pressure zones Control and Monitoring Elements: Number of valves to be permanently closed and number of meters used

5 Considerations for Implementation: Existing infrastructure supplying the network (water source, sizes of pipe, and condition) and natural boundaries (rivers, highways, railways, topography). PERMANENTLY ISOLATING the district boundaries Specific regulations related to water quantity and quality, including fire flows and pressure requirements. Pressure zones Control and Monitoring Elements: Number of valves to be permanently closed and number of meters used to monitor input/output flows. Size: in Urban Areas could vary between customers (UK recommendation) Big Question - Do adequate / accurate production and consumption meters exist in the system for the necessary water accounting

6 What is the problem and/or current paradigm? The complexity of sectoring dense water networks in order to obtain Minimum Night Flows for a quick detection of fresh leakage AND reduce ALR to 1 weeks time TRADITION DMA SOLUTION DMA. Static Sectoring Complex hydraulic / WQ studies and network modeling. High investment in order to close /create small areas leaving a single entry (enlarge pipe diameters). Risk of pressure variations modifying the standard water supply regime. Keeping water-tightness of the area. Low supply security in case of failure. Water quality problems (multiple dead-ends in the distribution system)

7 Small (Level 3) zones (sectorization) are created by hydraulic valve actuators. The actuator creates temporary DMAs/zones at night for MNF calculation. Results of the day-over-day calculation of MNF from input meter(s) is used to calculate the baseline level of leakage, and to identify fresh leakage via trending. Zones are sized to allow for identification and localization of leaks in a short period of time (one week). Use of the Smart Data Platform, Aquadvanced, to automatically calculate and continuously measure water balance, MNF, and zone pressures (at inputs). Customer AMI meter readings are used to support continuous water balance calculations, if available.

8 DMA/Sector Final location inside a sector Flow analysis (+ Pressure, Quality )

9 Daytime DMS situation. Static sectors & the rest of the network Night time DMS situation. Static sectors & sectors on

10 Total DMA Inflow (daily analysis)

meters* AMI AMR Manual reading Hourly/Daily Monthly

14 Efficiency (%) WATER BALANCE DMA NRW = Total DMA Inflow Total DMA Consumption DMA meters Customer meters* AMI AMR Manual reading Hourly/Daily Monthly 2-3 months (billing) *Customer meter readings needs to be synchronized

17 Permanent sector Dynamic sector

normal distribution conditions or water quality. Water Inputs Valve 01:00 a.m. Valves closing

18 Creating the Dynamic Zones How Dynamic Sectorization works DS allows, in a cost-effective way, calculation and monitoring of the minimum night flows into small sectors with no modification of normal distribution conditions or water quality. Water Inputs Valve 01:00 a.m. Valves closing Flowmeter Minimum night flow measurement Signals sent to Aquadvanced Valve 05:00 a.m. Valves opening Valve

19 Valves: - Existing PRVs - Hydraulic actuator (butterfly valves): o o o o o Uses system pressure as energy, so it does not require a connection to electrical power Very low maintenance Open and close speed control Very flexible installation, small footprint Suitable for fouling and scaling water

21 Quick to implement Minimal hydraulic modeling required Less capital intensive than traditional DMA Maintains system redundancy and network design No need to measure meter consumption data Not complicated by syncing routine meter reading schedule with night flow meter recording at inputs No risk to water tightness in zones Well established benefits Can also use valve actuator for pressure management

systems a D Grade America s drinking water systems face an annual shortfall

22 AWWA Buried No Longer Confronting Americas Infrastructure Challenge - $1Trillion Need American Society of Civil Engineers gives drinking water systems a D Grade America s drinking water systems face an annual shortfall of at least $11 billion to replace aging facilities USEPA Drinking Water Needs Survey

23 Introduction to a unique leak detection technology for non-metallic and large diameter pipes Provides for the reduction of real water losses in pipe networks, including historical unavoidable losses 23

24 As a result of this presentation What will viewers learn? Be brought up to date on an innovative leak detection technology What will they be able to do? Find and fix leaks in non-metallic pipes and large diameter water mains 24

25 Context Definition of the service Value / benefits Principles of the process Application of the technology Case study 25

In use since 2007 Helium injected into live water mains - no need to depressurize the water system Particularly suited for plastic & large diameter pipes, although suited for any material Can be

26 In use since 2007 Helium injected into live water mains - no need to depressurize the water system Particularly suited for plastic & large diameter pipes, although suited for any material Can be used in challenging conditions Long runs Intermittent pressures Difficult to locate leaks Injection can be used to pinpoint leaks for up to 5 days The system is Protected by International Patents

27 Reliable and highly accurate reduction in unavoidable lossses Superior performance to acoustic technologies Works in areas with few or very distant access points (e.g. transmission mains) Minimally intrusive into the pipe network Not limited to water network geometry or configuration No need to construct a launch pit or device to inject the helium Quick to deploy

28 Helium gas injection

Helium certified to 99.999% pure Utility Service Company, Inc.

678-235-0281 Facility : Madison, NC Helium Trade Designation Product

29 Helium certified to % pure Utility Service Company, Inc Peachtree Street Northeast Suite 1100 Atlanta, GA United States Facility : Madison, NC Helium Trade Designation Product Function Utility Service Company - Helium Series A Utility Service Company - Helium Series B

32 Patented Injection Process Standard Injection Point Injection through a standard ¾ inch tap

35 Sampling at a hydrant to insure helium distribution

36 Helium Distribution Considerations o Helium Injection Location o Drawing Helium into the Network o Dechlorination & Environmental Protection o Traffic Control & Safety United Water 2013 NRW Conference (5/15/13 Haworth, NJ)

37 Fully automated cart Drilling Leak detection / pinpointing

38 Drilling / hand probe of small holes needed in nonporous surfaces

39 Drilling of small holes needed in non-porous surfaces

40 Vehicle Mounted Detection

41 Vehicle Mounted Detection

43 Condition Assessment of Leaking Point Joints

44 1.5 miles - 48 inch Cast Iron Pipe Results - 3 leaks identified 1.0 miles - 30 inch Cast Iron Pipe Results - Flow in opposite direction than anticipated Pipe not surveyed

46 Drilling in paved roadways up to 36 inches in depth Multiple layers of pavement including blacktop, cement concrete and brick Locating of century old pipelines with old mapping Plumbing & connections American / Canadian threads Deep wet vaults 30 inch transmission main flow direction Weather - Rain, sleet, cold conditions Traffic control

47 ¾ Service at 410 Pleasantview replaced on April 19, 2013

48 President's Drive Flow (Gal/min) Flow Hydrant With Helium Repair Leak 10.5 gpm 8.7 gpm President s Drive DMA 4/13/13 4/19/13 4/19/13 4/22/13 Minimum Daily Flow 34,888 gpd 30,894 gpd

49 Deployed in live fully operable water system with no impact on operations Effective on all pipe sizes and materials Not limited by noise or electrical interference, or to system geometry or length of pipe(s) Less intrusive than other technologies Standard tap only needed for injection Nothing to get stuck or lost traveling through pipe Fast to implement (especially in relation to other tests in large pipes) Works in areas with few or very distant access points (like transmission mains)

50 Dynamic Microsectorization and Helium Leak Detection An Innovative Approach to Traditional DMA Brad Gresham Water Systems Specialist Utility Service Group

Municipal Water Experts Celebrated our 50 th Anniversary National Service Capability Part of a Global Group of Suez Companies Focused on Asset

Municipal Water Experts Celebrated our 50 th Anniversary National Service Capability Part of a Global Group of Suez Companies Focused on Asset Management and Preserving Water and Wastewater System Assets