Successfully Developing & Managing. Assessment & Rehabilitation Programs. Presented from a municipal perspective

Transcription

1 Successfully Developing & Managing Wastewater t Pipeline/ Manhole Condition Assessment & Rehabilitation Programs Presented from a municipal perspective Presented by: Jeff Maier, P.E. Metro Wastewater Reclamation District Denver, Colorado

2 The challenges municipalities are facing: ASCE s 2009 Report Card for America s Infrastructure: Grade for Wastewater t Infrastructure t is a D Cost effective asset management programs are more important than ever Doing more with less is the new normal Tighter EPA & CDPHE regulations Funding issues & aging g systems

3 The importance of condition assessment and rehabilitation Understanding your system is vital wastewater infrastructure is crumbling! Out of site, out of mind is no longer acceptable Critical component of successful asset management and budgeting Regulatory compliance issues Operation & Maintenance requirements Knowledge about your system = good decision making

4 Benefits of effective condition assessment and rehabilitation ti Reduces overflows, violations & failures Prioritizes repair and maintenance efforts Reduces emergency repairs or dig & replace Modern technologies utilize trenchless condition assessment and rehabilitation techniques Can save a lot of money!

5 Attributes of a successful condition assessment t& rehab program Goals and responsibilities are defined Organized & methodical Administered by qualified staff and/or consultants Uses available modern technologies QA/QC is paramount Reduces risk Helps asset management & maintenance efforts Improves capital expenditure planning

6 Condition Assessment Technologies & Management Techniques Available CCTV inspection Advanced d Pipe Condition Assessment Systems (Redzone, Cleanflow, PPR, etc.) Pole Cameras Manual and Entry Inspection Methods Database systems for inspection information storage GIS interfaces & state-of-the-art inspection software Consistent rating systems (NASSCO s PACP & MACP)

7 Rehabilitation Technologies Available Pipeline Rehabilitation: CIPP Lining UV-Cured CIPP Lining Sliplining Fold & Form Sliplining Structural Epoxy lining Spiral-Wound & Panel lining Cementitious lining Trenchless Point Repair Methods It s critical to understand each of the technologies; especially strengths & limitations.

8 Rehabilitation Technologies Available Manhole Rehabilitation: Epoxy Coating/ Lining Poly-Urea Coating/ Lining Urethane Coating Lining Calcium Aluminate Mortar Cured in Place Liners Fiberglass Inserts HDPE Manhole Inserts Cementitious Lining Polymer Mortars

9 Metro Wastewater s Interceptor & Manhole Condition Assessment & Rehab Program Systematic, consistent, & cost-effect approach to assessing & rehabilitating ti pipe and manhole conditions In-house developed program Collaborative effort between Engineering, Comprehensive Planning, and Operations & Maintenance (O&M) Departments t Balances operational, financial, and engineering g needs

10 Metro Wastewater s Interceptor & Manhole Condition Assessment Program Pipes inspected mainly by using CCTV In-house CCTV using MWRD crews 5-category pipe condition rating system 3-category manhole condition rating system Manholes surface & entry inspected Utilizes advanced condition assessment technologies Program utilizes customized database system and GIS interface

11 Defined Departmental Roles & Workflow O&M Department Televise pipelines (CCTV), inspect manholes/ structures, enter inspection info into database, initial condition rating Engineering Department Review CCTV footage, follow-up inspection of manholes, assign final condition rating, generate prioritization list & reports, design & manage rehabilitation project, research new technologies Comprehensive Planning Review rehabilitation prioritization lists & reports, update & manage Capital Expenditure Schedule Interdepartmental Cooperation & Responsibility: Results in successful in-house condition assessment and rehabilitation program.

12 Program Components: CCTV Inspection CCTV video inspections: Minimum of 10% of pipe segments annually 10 year video cycle for entire interceptor system CCTV work performed in-house by O&M Department crews In-house CCTV ensures consistency, eliminates scheduling issues, & ultimately saves money Customized 5-category rating system

13 Program Components: CCTV Review, Condition Rating Classification & Reporting 5-category CCTV review criteria developed in- house Rating criteria based on reinforced concrete pp pipe (RCP) conditions, but can be applied to all pipe materials Rating system is comparable to NASSCO s Pipeline Assessment & Certification Program (PACP), but meets specific needs of MWRD Specific definitions of each category define rehabilitation urgency and time frame for rehabilitation completion

14 Program Components: CCTV Review, Condition Rating Classification & Reporting Good No rehab at this time, maintain 10 yr cycle Fair No rehab at this time, maintain 10 yr cycle Fair-Poor Rehab may be necessary (5-10 yrs) Poor Rehab is necessary (2-5 yrs) Very Poor Rehab needed ASAP (0 Rehab needed ASAP (0-2yrs) Pipeline Rehabilitation report cost estimates based on condition ratings of Fair-Poor, Poor, and Very Poor only.

15 Program Components: Manhole/ Structure t Inspection Manhole surface & entry inspection examples:

16 Program Components: Manhole/ Structure Condition Rating Classification & Reporting Good No rehab at this time, maintain 10 year inspection cycle Fair No rehab at this time, maintain 10 year cycle, monitor as needed d Poor Rehabilitation is necessary (1-3 yrs)

17 Program Components: GIS Mapping Example GIS Map & Legend

18 Program Components: Interceptor Infrastructure System Database (IIS) CCTV & Manhole inspection data maintained real-time in IIS database IIS database developed in-house Oracle based system Manages inspection data, physical pipe & manhole info, and GIS system Streamlined condition assessment program Access searchable pipe & manhole/ structure condition information

19 Program Components: Supplemental Pipe Coring Activities Core drill sampling on selected pipe segments Coring used to confirm remaining pipe thickness Candidates for coring are pipe segments that may be rated in either category (i.e. fair-poor or poor) Coring work done by outside contractor Info entered into IIS database, compare to existing data & reevaluate current condition o rating Samples used to verify & check CCTV rating system

20 Research & Development New Condition Assessment Technologies Ongoing research of non-destructive methods to determine pipe condition & wall thickness Laser profiling, sonar systems, & combo assessment technologies (RedZone, CleanFlow. PPR) Will replace supplemental coring Will help improve rehabilitation prioritization CCTV will still provide majority of inspection information (CCTV ~90%, new method ~10%)

21 Research & Development Testing & Product Evaluation MWRD s 6-Step Manhole/ Concrete Rehabilitation Product Evaluation Program In-house developed program Evaluates products and applicators Helps ensure QA/QC Severe Wastewater Analysis Test (SWAT) Evaluates coating/lining g effectiveness & longevity in severe wastewater headspace environments Laboratory and real-life life test comparisons Accelerated test chamber & electrical impedance tests

22 Long-term Capital Expenditure Planning Interceptor Pipes Assumes pipes will be rehabilitated with CIPP lining for cost estimating purposes Other rehab methods considered during design (slip lining, fold & form, epoxy-lined, etc.) Cost estimates based on past MWRD rehab projects Historical CIPP cost data for pipe sizes 8-60 Current MWRD CIPP cost estimate data (installed price): 8-30 = $3.75 per in/ft = $4.50 per in/ft = $6.00 per in/ft

23 Long-term Capital Expenditure Planning Manholes/ Structures Assumes manholes will be be rehabilitated with epoxy coating/lining for cost estimating purposes Other rehab methods considered during design (other coating/liner types, CAM, fiberglass, HDPE) Cost estimates based on past MWRD rehab projects

24 Prioritization for Pipe & Manhole Rehabilitation Projects Pipe segments rated very poor will be repaired on priority basis (i.e. next available rehab project) Adjoining poor segments will be added when shared bypass pumping cost savings can be realized Assumed that only 75% of poor and fair-poor rated pipes will ever reach very poor condition Projected timing for when pipe segment or manhole will deteriorate and reach poor or very poor is considered Manholes rated as poor will be repaired on priority basis (i.e. next available rehab project) 10-year Capital Expenditure Schedule updated d accordingly

25 Conclusions A well-run Condition i Assessment & Rehabilitation i Program provides a systematic, consistent, & cost- effective approach to asset management Supports long term capital expenditure planning Effective in forecasting future maintenance needs, prioritizing resource allocation, and costs based on inspection & condition assessment ratings Reduces potential overflows, violations & failures Utilizes trenchless technology Can save a lot of money!

26 Questions? Jeff Maier, P.E. Metro Wastewater Reclamation District Denver, Colorado