DR MARK C WEBB. Managing Director. SSIS Sahara (Pty) Ltd. South Africa
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1 DR MARK C WEBB Managing Director SSIS Sahara (Pty) Ltd South Africa
2 LEAK DETECTION TECHNOLOGY PRECISE LEAK DETECTION TECHNOLOGY FOR ASSESSING THE CONDITION OF BULK WATER PIPELINES
3 Outline 1. Pipeline Inspection Objectives 2. Introduction - Pipeline Leak Detection 3. Inspection Technology 4. Case Study mm I.D. PCP 5. Case Study mm O.D. Steel 6. Case Study 3 80 Year Old Steel Pipe 7. Case Study 4 Smallest Verified Leak 8. Summary & Conclusions
4 Pipeline Leak Detection / Condition Assessment Objectives Prevent catastrophic failures Defer capital expenditure by eliminating unnecessary replacement of pipelines Reduce water loss by maintaining pipeline integrity Provide accurate condition assessments for effective rehabilitation strategies Enable regulatory compliance Save client s money!
5 Catastrophic Failures
6 Leaks that Never Surfaced
7 Pipeline Leak Detection & Location Major improvements in past 50 years Technology improved from surface detection (external) to advanced real-time, inline acoustic scanning Accuracy improved from shotgun to precise above ground location Pipeline owners/operators need to be aware of major improvements & accuracy
8 Pipeline Leak Clues Ground moisture / Standing water Water in drainage channels & sewers Transmission losses Pressure gradient Acoustic signal Reality Many medium to large leaks (i.e., litres/hr) never show any clues!
9 Water Loss in Bulk Pipelines Region Miles Leaks Leaks / mile North America (Urban) North America (Rural) UK Morocco Portugal Australia Worldwide 782 1, Hidden Leaks Per Mile Until recently, no effective means of finding leaks Led to assumption that bulk pipelines don t leak Actual rates of leakage found on bulk pipelines: Average of 1.4 leaks / km (2.2 Leaks / mile) Variation by region and material Average size of 150,000 Litres / Day (40,000 GPD) Cast Iron Steel Ductile Iron Concrete
10 Inspection Technology Requirements Proven effectiveness Cost-effectiveness of inspections Non-disruptive Utilize existing valves (i.e., 50mm openings) Accurate, precise and reliable Selected Sahara tethered, real-time in-line acoustic scanning technology
11 System Components Above ground tracking system Signal analysis Disinfection system Acoustic sensor Insertion system
12 Real-Time Leak Sizing
13 How does a leak sound? Flow Direction Drogue Umbilical Cable Sensor Head
14 Precise Tracking of Sensor Above-ground sensor tracking crucial Works in all pipes Soil covers >10 m Accuracy of 100 mm
15 Inspection Technology Components Mobile Inspection Vehicle Insertion Assembly Winch & Insertion Tube Drum, Controls & DAQ Drum, Controls & DAQ
16 Inspection Parameters Pipeline Material Pipeline Diameter All Types 250+ mm Pipeline Pressure 0.25 Bar (2.5 m) to 16 Bar (160 m) Flow Velocity Insertion Point Bore Survey Distance per Insertion Survey Distance / Day 0.5+ m/sec and above Any tap point 50 mm or greater Up to 2 km 2 to 4 km / day Directional Change Accommodation Sensitivity 270 degrees of bends for PCP Detects leaks as small as 1 litre/hr
17 Inspection Results Measuring Pipeline Pressure Bloem Water: Caledon- Bloemfontein 110 km 1170 mm I.D. PCP
18 Inspection Results (cont d) Measuring Pipeline Flow
19 Inspection Technology Insertion Points Germiston CBD Soweto Township Alrode Bloemfontein (Rural)
20 Case Studies Case Study 1 : Bloem Water 1170 mm I.D. PCP 110 km long pipeline mm I.D. Pre-stressed concrete Operating pressure: 500 kpa to 1320 kpa Flow velocity: 1.2 to 2.7 m/s Access at existing air & gate valves
21 Case Studies Case Study 1 (cont d) Leaks Detected & Verification (Phase I 30 km): Five (5) medium to large (1000+l/hr) leaks Four (4) occurred at previous repairs One (1) leak inside a valve chamber Only one (1) leak showed up on ground Due to water body, above leak could not be located and repaired Entrapped air and bends detected too
22 Leak Standing Water Case Studies Case Study 1 (cont d)
23 Case Studies Case Study 1 (cont d) Leaks No Visual Signs Bloem Water: Previous repair Leak Size : Litres/Hr Detected 300 m upstream already No visual signs
24 Verification Case Studies Case Study 1 (cont d)
25 Case Studies Case Study 2: DWAF s 1397 mm O.D. Steel 32 km long pipeline laid in mm O.D. Steel Access at existing air valves only Operating pressure: 110 kpa to 600 kpa (flow is reversed gravity flow) Flow velocity: 1.2 m/s to 1.7 m/s
26 Case Studies Case Study 2 (cont d) Leaks Detected & Verification Flow reversed due to flow demand Gravity flow vs pumped flow Operating pressures 100 kpa to 600 kpa Leak Trials: 300 kpa pressure Determine minimum threshold by barely opening gate valve (off-set to pipe) 75 l/hr detected on off-set << 75 l/hr on main barrel
27 Case Studies Case Study 2 (cont d) Leaks Detected & Verification: Two (2) leaks detected Leak No 1 of 250 l/hr at 200 kpa pressure No visual surface sign Leak No 2 of l/hr
28 Case Studies Case Study 2 (cont d) Leaks Detected & Verification: Leak No 2 at 450 kpa Visual sign of leak standing water Double leak!
29 Case Studies Case Study 3: 80-Year Old Steel Pipeline (Slip-Lined) 610 mm diameter steel laid in 1927 Slip-lined with 20 mm HDPE liner Failed pressure tests Conventional inspection technologies failed Operating pressure: 650 kpa to 900 kpa Flow velocity: 2.2 m/s to 2.4 m/s
30 Case Studies Case Study 3 (cont d) Typical Inspection Pictures
31 Case Studies Case Study 3 (cont d) Leaks Detected & Verification One (1) leak detected 40 litres / hour
32 Case Studies Case Study 4: Smallest Leaks Detected & Verified Ekurhuleni: 460 mm Steel pipeline (New) 100% Detection Accuracy Leak < 10 Litres/hour No visual signs Poor installation detected
33 Technology Features 1. Accurately pinpoints leaks from inside pipeline 2. Accurately locates leaks above ground to 100mm 3. Very sensitive : leaks as small as 1 litre/hr 4. Distinguishes between multiple leaks 5. In-line non-disruptive acoustic scanning 6. High signal-to-noise output 7. Sizing of leak 8. Provides both audible acoustic signal & visual spectrogram
34 Technology Features (cont d) 9. Tethered (controlled) inspection 10. Mapping pipeline route, bends & entrapped air 11. Real-time measurements 12. All pipe material types 13. All pipe sizes 250 mm and larger 14. No special fittings required (air valves) 15. Inspection distance of 2km per insertion 16. Proven track record
35 Summary and Conclusions 1. Most appropriate technology was implemented 2. Success of technology demonstrated 3. Many medium to large leaks never show any visual surface clues 4. Active leak detection is crucial in pro-actively saving water 5. Proficient leak repair program 6. Ideal pipeline condition assessment tool 7. New advances Live CCTV inspections
36 The End
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