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Diagnostic Imaging for a Systematic Approach to Asset Management

Diagnostic Imaging for a Systematic Approach to Asset Management. Structural Condition Assessment of Corrugated Metal Pipe using Backscatter Computed Tomography (BCT). State of The Industry. Industry Trends and Needs Asset management is a focus.

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Diagnostic Imaging for a Systematic Approach to Asset Management

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  1. Diagnostic Imaging for a Systematic Approach to Asset Management Structural Condition Assessment of Corrugated Metal Pipe using Backscatter Computed Tomography (BCT)

  2. State of The Industry Industry Trends and Needs • Asset management is a focus. • To get there the industry needs to employ processes and technology to inventory, identify condition state and rehabilitate or replace as effectively as possible. • Planning and budget optimization are the desired outcomes and are achievable by using a holistic asset management approach.

  3. The Ugly Duckling Bridge Corrugated Metal Pipe Roadway Culvert • “It is very common to find culverts under many state, county and municipal roadway systems. In most states, there are three to five times as many culverts in service as bridges. For states such as Ohio with more than 30,000 bridges, or Texas with more than 50,000 bridges, the number of culverts is overwhelming.” • http://www.conteches.com/knowledge-center/pdh-article-series/inspection-evaluation-and-load-rating-of-installe.aspx

  4. Specific CMP Problem Soil Voids Leading to Structural Instability • The soil envelop is load bearing • Soil instability will compromise the entire structure • Early pipe deformation limits rehabilitation options • Voids create stress risers in the pipe • Ultimately leads to deformations in the roadway and potential failure

  5. Current Inspection Methods • Visual Inspection can Identify • Corrosion, Joint failure and misalignment, deformation, ovality, channel misalignment and scour • Difficult to make consistent and repeatable and ultimately it is impossible to assess structural integrity based on visual results alone • Acoustic (Knock) Test can identify • Regions suspected of undermining or voiding • Good screening tool, however it is subject to false positive void results and is difficult to report in a systematic fashion • Neither provide conclusive information about structural integrity or soil stability

  6. Information Gap • Unseen cues of structural deficiency represent an information gap • Undermining • Soil movement • Piping • Void formation • Visual and Acoustic • Are not definitive but are useful as a screening tool • Backscatter Computed Tomography (BCT) is used to fill the information gap • Identify, visualize and quantify voids • Post construction QA/QC (grout placement)

  7. the first CAT scan for infrastructure backing material void steel wall

  8. Inversa’s Solution Three Part Condition Assessment: • Visual Inspection • Acoustic Inspection • BCT Imaging with Insight™ • Conclusive and Quantifiable data • Complete optimized information for repair replace decision

  9. 1: Visual Inspection Visual Inspection: • Rigorous and repeatable 12 point visual inspection process • Digitally trended data and photographs presented in engineering report with to-scale pipe map • Seamlessly integrated into asset management systems Outlet invert completely corroded Heavy rusting at bolt line

  10. 2: Acoustic Inspection Acoustic Inspection: • 100% coverage of acoustic anomaly identification • Digitally trended data is presented on a to-scale culvert map • Seamlessly integrated into asset management systems

  11. To-Scale Pipe Map To scale, digital, auto-generated representation of all culvert anomalies – visual, acoustic, BCT and previously provided data Guides BCT deployment BCT provides structural diagnostic information of soil envelope Together you have a conclusive view of structural integrity of the asset Information is used to safely planwhether to rehab, replace or defer maintenance This takes the guess work out of asset management All information in the culvert map is referenced in complete culvert report to: BCT images, visual indicators and acoustic anomalies

  12. 3: BCT Images No Void Soil BCT image of Acoustic Anomaly confirms the presence of soil directly behind the culvert wall

  13. Sample BCT Images No Void Transition to Void Void Soil Void

  14. Sample BCT Images – Large Void Large Void With Piping A water channel (piping) Soil Void Corrugated Metal Pipe BCT inspection of Acoustic Anomaly shows significant void behind the culvert wall

  15. InversaSystems Using Insight™ • Conduct a Conclusive Structural Analysis of CMP assets. • Prioritize Critical Assets in any size system using a tiered assessment approach based on condition, risk profile and replacement cost. • Baseline, Monitor and Trend deteriorating assets to safely optimize service life. Integrating information with existing asset management system. • Increase Safety by achieving more effective rehabilitations and safely deferring maintenance based on conclusive information. • Conduct Post Construction QA/QC to validate grout placement, increasing rehab confidence and reducing risk • Remove the Guessing Game from your Asset Integrity Management plan

  16. Increase Confidence and Expected Service Life for Rehab Projects • It is possible to conduct a rehab that achieves the same results as a new installation. • Proper understanding of the problem • Allows a precise solution to be engineered for • Levee Drain Pipes • Storm Sewer Systems • Roadway Culverts • Meeting performance specs of a new installation and exceeding performance specs of the original installation

  17. Case Study: Storm Sewer System Guelph, Ontario, Canada

  18. SES 2673

  19. SES 2673 A-1656 B-1657 C-1660 D-1661 E-1666 J-1664 F-1663 I-1665 E-1662 H-1667

  20. Guelph Case Study Conclusion Project • 17 sections CSP - 1.5m (Stevenson) and 3.5m (Stone) in diameter • Approx. 1m - 7m fill over pipes • Some significant visual anomalies • Ceiling deformation • Isolated through wall perforations • Seam separations up to 4cm – backfill visible • Coating deterioration • 44 acoustic anomalies identified • Largest anomaly approx. 2.25m horizontal • Some anomalies stretch above/below springline, indicative of surface water infiltration • Some anomalies are on both opposing walls (significant stress riser), indicative of localized soil weakness • BCT recommended for 28 locations • 31 BCT images resulted in the identification of 18 confirmed soil voids.

  21. Case Study: Levee Flood Protection System Louisville, Kentucky, USA

  22. MSD Gate 138 • 10 acoustic anomalies found, 9 inspected, 6had confirmed void • Bitumen coating was eroded, deterioration of the barrel, seam separations of up to 3cm

  23. MSD Gate 138 G1277 C1282 A1272 B1276

  24. HDPE Liner

  25. Louisville Kentucky Case Study Conclusion Project • 5 sections CSP - 1.5m and 2m in diameter, one of which had been previously sliplined with an HDPE liner • Approx. 7m fill over pipes • Some significant visual anomalies • Heavy localized corrosion • Seam separations • Coating deterioration • 39 acoustic anomalies identified • Largest anomaly approx. 1.9m vertical .9m horizontal • Some anomalies stretch above/below springline, indicative of surface water infiltration • BCT recommended for 39 locations • 33 BCT images resulted in the identification of 14 confirmed voids. • Pipe slippage was found • Not all anomalous locations contained voids • Void was found in the absence of through wall corrosion • Void was found at seam gaps Based on this work, commercial deployment of Inversa’s Insight system is viable for both corrugated steel levee pipes and HDPE sliplined levee pipes for soil side voiding and grout placement verification.

  26. Case Study: Roadway Culvert British Columbia Remote Service Road to Mine

  27. Mining Road Culvert

  28. Mining Road Culvert F-1847 • E-1846 • C-1844 • B-1843 D-1845 • A-1843

  29. Case Study Conclusion Project • 9 CSP Road Culverts at 6 locations ranging from 1.8m to 3.7m diameter • Ranging in fill depths from Approx. 2m to 45m+ • Some significant visual anomalies • Misalignment • Blockage • 24acoustic anomalies identified • Largest anomaly approx. 7m horizontal x 1m vertical • Some anomalies stretch above/below springline, indicative of surface water infiltration • Some anomalies are on both opposing walls (significant stress riser), indicative of localized soil weakness • BCT chosen for worst three locations • 14 BCT images resulted in the confirmation of adequate backfill at all suspected void locations. This represents false positives of the acoustic testing.

  30. Conclusion Visual and acoustic mapping alone cannot accurately quantify undermining. Current inspection methods can both under and over estimate the culvert condition. With BCT you can: • Avoid costly replacements • Detect nonconformance early • Trend deterioration – repair only when necessary • Quantify necessary repairs • Increase safety and reduce maintenance costs • Repair voids prior to slip-lining • Verify grout placement post sliplining Therefore, you can confidently optimize asset lifespan with proper and necessary Asset Integrity Management.

  31. CONTACT INFORMATION: • Stephen McCormick, P.Eng • Technical Sales & Business Development • Inversa Systems Ltd. • (506)455-8845 (w) • (506)261-1380 (c) • (506)455-6799 (f) • Inversasystems.com • stephen@inversasystems.com

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