Leak Detection in Large Diameter Mains Waterloss Europe 2017 Pedro Pina, Regional Director for Europe and Africa
We Help Prevent Pipe Leaks & Breaks 2
Why do pipes fail? Operational Pressure Weakening of Pipe Mechanical Overload External Loading Failure
Age alone is a poor indicator of condition 40mm 31mm 24mm 1908 CI - Pit 1952 CI- Spun 1957 CI - Spun 15mm 11mm 1965 DI 1976 DI 10mm 1991 DI 915-mm Diameter Pressure Rated for 150 psi 4
PCCP Performance Based on a Statistical Review of Fifteen Years of Inspection and Monitoring Data 5
Before condition assessment After condition assessment
Structural Engineering Understand the significance of the damage
Remaining Useful Life Understand when the pipeline may need to be replaced Capital planning Wall thickness measurements Rate of wall loss Time to Failure
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 Frequency Remaining Useful Life Estimation 350 300 250 200 150 100 50 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0 100% Time to Yield (years) Frequency Cumulative %
Leak & Gas Pocket Detection Leaks can be a precursor to failure Gas pockets promote internal corrosion in force mains and create hydraulic restrictions in water mains Provides indicator data for joint condition Provides screening level assessment
Introduction to SmartBall SmartBall is a free-swimming acoustic leak detection tool that can detect and locate very small leaks and gas pockets with high accuracy Applicable in pressure pipelines over 8 inches and in all pipe materials including PCCP, metallic, and PVC Applicable in water and wastewater networks 2
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Miles of Pipe Detected with SmartBall PCCP 4065 km AC 45 km BWP 120 km Pure Technologies has inspected over 8000 km of pipe and detected nearly DI 1670 km PVC 233 km 2,000 leaks on transmission mains Steel 906 km CI 181 km 14
Leaks Detected with SmartBall (per 100 km) DI 43 Steel 33 BWP 13 PVC 36 AC 51 PCCP 21 CI 132 15
Introduction to Sahara Sahara is an inline leak and air pocket detection platform with CCTV and sub-meter mapping technology for all pipe materials No disruption to service Used in pipelines 6 inches in diameter or larger 2-inch or larger tap (any orientation) required for insertion Same day results Ideal in complex and urban systems 2
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18 The Sahara Experience Inspection Totals 2004-2016 94 leaks per 100 km 5,679 Leaks 6000 Km
Case Study Milan SmartBall Inspection 9 km Steel 1200mm Unknown condition Leak detection as a screening approach 24 leaks detected grouped in 3 zones Leak volume was undetected on flow meters 20
Case Study NRW project in Malaysia 21
Case Study NRW project in Malaysia 22
Overview of Pure s Work With Dallas Water Utilities (since 2007) 2014 Pure Technologies US
24 Program Success Summary 508 miles inspected since 2007 240 miles leak detection 268 miles with electromagnetics (EM) 208 large diameter leaks found and repaired 79,493 pipes inspected with EM (268 mi) 2,846 pipes with broken wires (3.6%) 569 large PCCP pipes repaired or replaced Many MAJOR failures avoided!
25 DWU s approach 1. Condition Assessment & Repair Risk based prioritization > Structural assessment using electromagnetics > 2. Leak Detection & Repair Small diameter done in-house Medium/Large diameter outsourced > 3. Pipeline Replacement 1.4% per year (68 mi/yr) goal
26 Pure has completed 240 miles of leak and gas pocket detection for DWU 208 leaks found and repaired
Leaks per 100 miles Decreasing number of leaks per mile inspected 60 Leaks per 100 miles of Inspection 50 40 30 20 10 - FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 FY15
Million Gallons 3.5 Billion Gallons Saved since 2007 Millions of Gallons of Treated Water Saved 4,000 3,500 3,000 2,500 2,000 1,500 Larger leaks found in recent years 3,493 1,617 1,000 500-351 456 185 111 91 166 244 272 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 FY15
Westmoreland Rd. Leak Aug 2015 12-inch diameter Ductile Iron, 1981 (34 years old) Tethered Leak Detection method 1 leak Not surfacing Estimated 9 250 M3/Day Missed by external leak survey
Greenville Pipeline Leak Aug 2015 Tethered Leak Detection method 24-inch diameter Cast Iron, 1952 (63 years old) 8 feet of Cover - Adjacent to tributary 1 leak Non-Surfacing Estimated 6500 M3/day Missed by external leak survey
Conclusion Leak detection in large diameter pipelines is relevant not only for NRW but also for condition assessment purposes, leaks can be the precursor of pipeline failures Inline leak detection is probably the most efficient way to access leakage in large diameter lines and we have the numbers to prove it 31
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