Using Condition Assessment to more Efficiently Manage your Pipelines

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Terence Rogers
6 years ago
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1 Using Condition Assessment to more Efficiently Manage your Pipelines

2 Traditional Management Approach Prioritize Pipelines Replace Pipelines Traditionally, prioritizations were based on age, material and break history Node to Node Approach EPA reports that 70-90% of pipe being replaced with Remaining Service Life 2

3 Key Concepts in Condition Assessment Let s focus on some general concepts: Understand failure modes Use risk to drive correct level of data collection Collect the right data to make good decisions Proper data analysis is critical Allow condition, risk, and cost to drive long-term decisions on pipeline management Re-evaluate risk based upon data findings

4 Risk Confident Based Decision Condition MakingAssessment Strategy Priority of Pipeline LOW MEDIUM Assessment Techniques Hydraulic Study Corrosion Survey HIGH Inline Acoustic Survey Inline Pipe Wall Screening High Resolution Inline Scan Medium Resolution Inline Mapping Survey Test Pits Analysis Engineering Evaluation Structural Model Statistical Life Cycle Analysis RESOLUTION RELIABILITY

5 Condition Assessment Tool Selection There is no silver bullet technology, it is a combination of tools and sound engineering that provides reliable assessment Use risk to select condition assessment tools High risk pipe High resolution tools Least expensive tools may not be the best value

6 Statistical Evaluation: What is a Distribution? Sample size matters

7 Ferrous Pipelines Statistical analysis incorporating inspection data and engineering analysis can be used to predict remaining useful life of ferrous pipelines. Minimum Data Required number of integrity measurements to achieve desired confidence level adequate data collection methodology to ensure representative sampling structural analysis based on design standards, current loading and operational conditions

8 Statistical Evaluation: Remaining Useful Life Based on corrosion wall loss. Wall thickness measurements Rate of wall loss Time to Failure

9 Prestressed Concrete Cylinder Pipe Statistical analysis incorporating inspection data and engineering analysis can be used to predict remaining useful life of PCCP pipelines. Minimum Data Required number of integrity measurements to achieve desired confidence level adequate data collection methodology to ensure representative sampling structural analysis based on design standards, current loading and operational conditions utilize known industry data on material history

10 PCCP Inspection Data Findings Percent of PCCP Pipe Sections with Distress 5.0% 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% 1.5% 1.0% 0.5% 0.0% Pre Post 1992

11 Wire break patterns in PCCP = there is no pattern Apr-07 Nov-07 Jun-08 Dec-08 Jul-09 Jan-10 Aug-10 Feb-11 Sep-11 Apr-12 Oct-12

12 Network Complexity Leak/Gas Pocket Detection Correlators Maximum Value Tethered Maximum Value Free-Swimming Maximum Value Pipe Diameter Leaks are often a precursor to failure.

13 Manned/Free Swimming/Robotic Tools Manned Free Swimming Robotic Diameter: 36-inch + Video Visual Mapping Diameter: 16-inch + SD Video Sonar Diameter: 20-inch + HD Video Sonar, Laser Mapping

14 Test Pits Ultrasonic (UT) Pulsed Eddy Current External MFL Visual Inspection Soil Testing Material testing

15 Case Study 1 4 miles of 12, 16, 24, 30, and 36-inch CI, DI and PCCP Pipe August 2017: Sahara Assessment for leaks and internal inspection

16 Revisions to GIS Mapping Utilizing Sahara Locations

17 Internal Inspection of Water main

18 Sahara Inspection Results Table 1.1: Summary of Sahara Inspection Results Insertion Number Start Location/ Line Flow Velocity (ft/s) Desired Distance (feet) Actual Distance (feet) Pipeline Pressure (PSI) Survey Date No. of Leaks 1 Cummings Road Plumber Rd., Gorham Section 5 28 Allison Ln Gorham Section Winn Rd. & Woodville Rd Winn Rd. Section Winn Rd. & Inverness Winn Rd. Section End of Allison Ln Gorham Section Field Excavation Gorham Section Field Excavation Gorham Section Field Excavation Gorham Section

19 Case Study 2 3 miles of 24/30-inch Ductile Iron Pipe October 2015: SmartBall and PipeDiver County Line

20 Leak/Air Detection Results Confirm the functionality of the ARV at Gas Pocket Location.

21 Electromagnetic Results

22 Electromagnetic Inspection Results Pipe Sections with EM Anomalies 1%

23 Structural Analysis 429

24 Immediate Repairs Country Dale School Repair Pipe 444 and replace Pipe % % 45% 55%

25 Recommendations Re-inspect in 3 to 5 years with particular focus on areas that showed pipe loss. Utilize future inspections to determine repair and/or replacement needs.

26 Final Thoughts Condition Assessment can be used to more efficiently manage your pipes. Understand failure modes Use risk to drive data collection Collect the right data to make good decisions Proper data analysis is critical Allow condition, risk, and cost to drive long-term decisions on Capital Investment STOP AGE DISCRIMINATION ON YOUR PIPES

27 Jeff Zdrojewski, P.E. Business Development Manager

Assessment Methods For Large Diameter Water & Sewer Pressure Pipelines

Assessment Methods For Large Diameter Water & Sewer Pressure Pipelines Procrastinator s Workshop Thursday, December 12, 2013 Presented by: Michael J. Livermore Midwest Regional Manager Solutions for Sustainable