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Ldssap inspection technologies presentation same 2018

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Ldssap inspection technologies presentation same 2018

  1. 1. City of Arlington Water Utilities Department
  2. 2. City of Arlington,Texas 2 • Centered in the Dallas/ FortWorth metropolitan area • City of Arlington was first incorporated in 1876 with a population of 300. • Over the past 130 + years, Arlington has grown to 365,500 people. • City of Arlington is home toThe University of Texas at Arlington,General Motors,Texas Rangers and Dallas Cowboys
  3. 3. City of Arlington,Texas 3 • DailyWater Demands 35 MGD to 105 MGD • RatedWater Production Capacity of 172.5 MGD • 1,425 Miles of PublicWater Main • 1,222 miles of Sanitary Collection System • 6-inch to 72-inch in diameter • Average Pipe Age 29Year
  4. 4. City of Arlington,Texas 4 • Age rarely correlates with condition (Water Research Foundation) • 70% to 90% of replaced pipelines have remaining life (US EPA) • “New” technology may be proven technology • Failure of large mains cause biggest impact
  5. 5. City of Arlington,Texas 5 • Move beyond age, material and failure focus • Assess actual pipe condition • Savings from focused pipe replacement fund transition to proactive replacement
  6. 6. • Maximizing useful life of assets • Efficient spending of replacement dollars • Avoid major unplanned repairs • Make better design decisions for new mains City of Arlington,Texas 6
  7. 7. Case Study
  8. 8. City of Arlington,Texas 8 • 2.6 miles, 42”, 48” & 54”, Prestressed Concrete Cylinder Pipe (C301), 1982 • Estimated Replacement Cost $10,500,000 • Assessment Cost $286,500
  9. 9. City of Arlington,Texas 9 • Assessment Results • 599 pipe segments • 27 segments with wire breaks (4.5%) • 6 segments with 25+ wire breaks (1.0%) • Cost avoidance of $7,000,000 27 Pipes with Broken Wire Wraps 4.5% 572 Pipes No Distress 95.5%
  10. 10. City of Arlington and University ofTexas at Arlington Collaboration
  11. 11. City of Arlington,Texas 11 • Installed in 1983 • 66-inch RCP Sanitary Sewer • Repair Cost $138,000
  12. 12. City of Arlington,Texas 12 • Total Replacement Scope • 14,875’ of 66” Main • 3,450’ of 60” Main • Assessment Results • 1,000’ Compromised • 1 Unused Meter Station to be Abandoned • Cost avoidance of $17,097,000 1000’ Significant Corrosion 5.5% 17,322’ Low Corrosion 94.5%
  13. 13. • Inspect 48 miles of 24-inch to 72-inch Sanitary Sewer Main • AWU / UTA partnership • Pre-Inspection Research • HD CCTV, Sonar and Laser Inspection • Laboratory MaterialsTesting (Planned) • Data Analysis and Report Summarizing Findings • CIP Development/Risk BasedAssessment City of Arlington,Texas 13
  14. 14. • Multi-Sensor Inspection Platform • HD CCTV Camera • Laser Ring Profiler • Sonar City of Arlington,Texas 14 HD CCTV Camera 2D Laser Profiler Sonar
  15. 15. City of Arlington,Texas 15
  16. 16. City of Arlington,Texas 16
  17. 17. City of Arlington,Texas 17
  18. 18. City of Arlington,Texas 18 • Validated life cycle analysis • Core sample confirmation • Customized output • Partnering with a nationally recognized pipe research institution
  19. 19. City of Arlington,Texas 19 Pipe Critical Defect Summary
  20. 20. City of Arlington,Texas 20 Debris and Deposit Blockage
  21. 21. City of Arlington,Texas 21 Debris and Deposit Blockage
  22. 22. City of Arlington,Texas 22 Root Intrusion
  23. 23. Case Study
  24. 24. City of Arlington,Texas 24 • 1 Previous Emergency collapse withWall Thickness of 2.25” • WallThickness Just after Repair is 3” • The Meter Station/H2S Issue still Exists
  25. 25. City of Arlington,Texas 25 • 100% Corroded Ductile Iron Pipe • 1 Large Obstruction • 5’ drop at old wet well • Severe H2S corrosion • Capacity issue • Under Interstate 20 • No Casing pipe • Constructed 1983 • Parallels creek
  26. 26. City of Arlington,Texas 26

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