Wastewater Collection System Condition Assessment. Putting it all Together

Transcription

1 Wastewater Collection System Condition Assessment Putting it all Together

2 Drivers for CAP CMOM and SSOI Commitment 10-year Program to inspect the entire Collection System Asset Management Approach to Identify Baseline condition Assessment Single Data Repository for Inspections that integrate with GIS and Maximo Continuous Demand to Improve Customer Service Better Justification of Capital Investments Maximize Value of System Renewal Dollars for Aging Infrastructure

3 Risk Based Assessment Risk = ƒ (Condition x Criticality) Criticality Condition Very Good Good Fair Poor Very Poor Low Impact 2. miles 0.8 miles 0.5 miles - - Medium Impact 17.9 miles 17.5 miles 9.5 miles 1.1 mile - High Impact 2.8 miles 25.2 miles 18.8 miles 0. miles - Very High Impact 2.7 miles 12. miles 3.2 miles - -

4 Draft Work Plan

5 Inspection Progress Fiscal Year 2017 Inspections Phase 1 Inspections Phase 2 Inspections 65,590 LF Inspected 187 MH surveyed, 10 MH Inspected Beck Branch Gravity Sewer 10,869 Linear Feet; 19 Manholes Indian Creek Trunk I 10,958 Linear Feet; 23 Manholes Shiloh Road Business Park 6,90 Linear Feet; 10 Manholes Spring Creek Trunk Sewers 11,55 Linear Feet; 30 Manholes Watters Branch 25,305 Linear Feet; 58 Manholes 36,688 LF Inspected 219 MH surveyed, 9 MH Inspected Preston Road Trunk,685 Linear Feet; 11 Manholes Preston Road Extension 2,629 Linear Feet; 11 Manholes Plano Trunk Sewer 7,77 Linear Feet; 25 Manholes McKinney Prosper Sewer 21,600 Linear Feet; 7 Manholes

6 CAP FY 2017 Phase 1

7 CAP FY 2017 Phase 2

8 Tools and Technology

9 Multi Sensor Inspection

10 3D Laser Inspection

11 Sonar Inspection

12 HD Video Inspections

13 Digital Manhole Inspections Accurate Point Cloud Measurements Identify Defects, Pipeline Locations and Inverts, Manholes, and Lining Materials No Manned Entry Required MACP Assessments

14 Digital Manhole Inspections FY 2017 Ph 1: 10 Manholes Inspected MACP Level 2 23 Unmapped Manholes found FY 2017 Ph 2 : 9 Manholes Inspected MACP Level 2

15 Multi Sensor Inspections

16 Digital Manhole Inspections

17 GIS Integration into ITPipes

18 Developing Remaining Useful Life (RUL) Developed for each pipe specification Condition score for concrete pipes based on location of steel reinforcement cage Condition score for flexible and rigid pipes based on ovality Condition score for VCP pipes based on HD CCTV and defects

19 RUL Calculated Based on Data

20 Determining Remaining Useful Life DRY = Deterioration Rate per Year for Concrete Pipe Based on Pipe Age and Inspected Maximum Corrosion Several Factors for High DRY including: Manufacturing Issues High Turbulence Pipe Bends Incorporated DRY into rating matrix RUL is automatically calculated for each corrosion observation Pipe s age, maximum corrosion, RUL in years remaining, and RUL calendar year of failure are automatically calculated

21 Determining Remaining Useful Life % % % % > 15.0% years years years 3-10 years 0-2 years RUL is automatically calculated for each ovality observation Pipe Manufacturers Specify % Maximum Initial Deflection

22 Inspection Results Pipeline Inspection Results Ovality: 19.5%, RUL = 0 2 Years

23 Pipeline Inspection Results 70,000 Represents 8,503 out of 102,278 Linear Feet (Year 1 and Year 2 Phase 1) with RUL less than 10 Years 60,000 Linear Feet 50,000 0,000 30,000 20,000 10, Remaining Useful Life (years) VCP PVC RCP DI 0-2

24 Pipeline Inspection Point Defects 5 segments need point repairs to extend RUL

25 Pipeline Inspection Results (RUL) Asset ID WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI WWPI Total Length (LF) ,502.6 RUL Score RUL (years) Material Diameter (in) Vitrified Clay Pipe 2 Polyvinyl Chloride 21 Polyvinyl Chloride 30 Polyvinyl Chloride 2 Vitrified Clay Pipe 27 Vitrified Clay Pipe 27 Vitrified Clay Pipe 27 Vitrified Clay Pipe 27 Vitrified Clay Pipe 27 Vitrified Clay Pipe 27 Vitrified Clay Pipe 2 Vitrified Clay Pipe 2 Vitrified Clay Pipe 2 Vitrified Clay Pipe 2 Vitrified Clay Pipe 2 Vitrified Clay Pipe 21 Vitrified Clay Pipe 21 Polyvinyl Chloride 2 Polyvinyl Chloride 2 -

26 Pipeline Inspection Results (Cleaning) Asset ID Length (LF) Debris (CF) Material Reinforced Concrete Pipe Diameter (in) WWPI WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 36 WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 36 WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 2 WWPI Vitrified Clay Pipe 27 WWPI Reinforced Concrete Pipe 39 WWPI Polyvinyl Chloride 2 WWPI Polyvinyl Chloride 2 Total 6, ,

27 Summary of Findings 87% of inspected gravity mains have an RUL of 21 years or more RUL Score RUL Inspected Percent (years) (LF) of Total ,82 59% ,52 28% 11-20,27 % 6,38 6% ,06 2% Recommendations None at this time None at this time Monitor and Repair as needed Reinspect in 2-5 Years, Monitor and Repair as needed Repair or Rehabilitate 70% of FY 2017 Ph 1 Manholes are in good condition 25% need minor repairs Recommendations Repair Chimney (replace covers, coating, etc.) Replace Frame and Cover Rebuild Collar 5% need substantial repairs Rebuild Frame Seal Evaluation of FY 2017 Ph 2 Results ongoing Count Raise Rim to Grade 1 Rebuild Wall Surface 2 Repair MH Wall 1 Coat MH Wall 25 Repair Bench 1 Rebuild Bench Pipe Seals 1

28 Cost Savings Traditional practice: cleaning lines prior to inspection Cost to clean all lines inspected-to-date: $2,089,876 Opportunity to reduce O & M costs by inspecting first Identified 6,21LF that needed cleaning Cleaning Cost Diameter Inspected (in) (LF) ($ / LF) Cost ($) ,891 $ $ 350, ,502 $ $ 1,510, ,885 $ 7.00 $ 229,580 Total 102,278 $ 2,089,876 Cleaning Cost to Date $ 318,800 Savings to Date $ 1,771,076

29 Benefits of CAP Enhanced understanding and knowledge of asset condition and life cycle Restoring capacity through detailed cleaning and debris removal Remaining useful life linked to GIS/Maximo/ITPipes Reduction in: Reactive Maintenance Cleaning Costs Emergency repairs

30 Acknowledgements NTMWD White Rock Jenna Covington Consultants Scott Hoelzle Rod Thornhill Rodney Hughes Shela Chowdhury Sharon Miller Bret Ellis James Pearson Freese and Nichols Doug Ashworth Stephen Johnson Ace Pipe Cleaning Bruce Jameson Casey Carentine

31 Questions? Justin Diviney - jdiviney@ntmwd.com Lauren Kubin - lkubin@ntmwd.com Jessica Brown - jlb@freese.com Mazen Kawasmi - mhk@freese.com