Using Acoustic Inspections to Prioritize Sewer Cleaning. George Selembo, PhD, PE November 14, 2013
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1 Using Acoustic Inspections to Prioritize Sewer Cleaning George Selembo, PhD, PE November 14, 2013
2 PRESENTATION OUTLINE Acoustic Inspection Overview Acoustic Inspection Economics Case Studies Conclusion
3 WHAT IS THE PROBLEM? Overflows are a Symptom Not the Problem
4 PROBLEM: INFORMATION Cleaning a pipe costs about the same as inspecting a pipe >80% of pipes less than 12, accounts for >90% of SSOs Historical GIS Helpful But Insufficient Where & When to Deploy Cleaning Resources Cost Effective & Timely Condition Information
5 INSPECTION METHODS Manhole Inspection ACOUSTIC Zoom Camera Push Camera CCTV/Robotic Camera Pipe Wall Defect Scanners Pipe Profiling / Robotic Multi-Sensor
6 Inspection Resolution INSPECTION METHODS HIGH Wastewater Pipe Condition Assessment Applications Pipe Wall Defect Detailed Pipe Profiling Blockage Pipe Condition Push Camera CCTV Acoustic Zoom Camera LOW Manhole Inspection LOW Relative Cost HIGH No Contact with Flow: Contact with Flow:
7 ACTIVE ACOUSTIC PIPE INSPECTION BACKGROUND Patented technology Gravity-fed sewer focus Developed in Charlotte with CMUD as key partner Over 3M feet inspected Rapid assessment helps better focus cleaning and CCTV resources
8 ACOUSTIC INSPECTION How Does it Work? TECHNOLOGY
9 KEY FEATURES OF ACOUSTIC INSPECTION No Flow Contact / No Confined Space Entry Simple to use train operators in minutes Low Cost Pennies/foot Rapid Onsite Results Under 3 min./segment Portable < 30 lbs GIS Integration GPS Enabled Archive Pipe Segment Blockage Assessments
10 ACOUSTIC INSPECTION APPLICATIONS Focus Cleaning Effort Reduce Cleaning by Over 50% and Enable Condition Based Maintenance Eliminate Repeat and Downstream Overflows Post Cleaning Quality Assurance Quick Collection System Condition Assessments When Taking Over New Areas
11 OPPORTUNITY FOR IMPROVEMENT In order for rapid pipe inspection to be economical, two conditions must be satisfied: Substantially cheaper than current inspection methods Significant number of pipes do not require immediate attention
12 $/foot Inspected COST EVALUATION $0.14 $0.12 $0.10 $0.08 SL-RAT Acoustic Inspection Cost Typical Operating Range Municipal Cleaning ~$1.00/foot Fully Loaded Wage Rate at $16/hr at $33/hr $0.06 $0.04 $0.02 $- Feet Inspected/Day 1
13 Relative Occurance HOW MUCH CLEANING IS WASTED? Acoustic Inspection Results ~1Million Feet of Pipe 9% 14% 19% 58% Blockage Assessment (0-Blocked thru 10-Clean) Target Historical Problematic Areas >50% Pipes Essentially Clean <10% Need Immediate Action Cleaning a Clean Pipe Wastes Resources Not Cleaning a Dirty Pipe SSO
14 FINANCIAL IMPACT Assumptions: Cleaning cost is $1.00/ft Acoustic inspection cost (SL-RAT) is $0.10/ft Inspect 10,000 linear feet of sewer pipe per day (using acoustic inspection) 50% reduction in cleaning
15 FINANCIAL IMPACT (cont d) Upfront equipment cost ~$20,000 10,000 ft/day of inspections 50,000 ft/week Acoustic operating cost $5,000/week Cleaning reduction (50%) 25,000 ft/week $25,000/week PAYBACK PERIOD of ONE WEEK
16 CASE STUDIES Charlotte, NC Augusta, GA Virginia Beach, VA
17 CHARLOTTE, NC Manages 4,100 miles of sanitary sewer lines Initial development partner for acoustic inspection technology Acoustic inspection (SL-RAT) featured technology in 2011 Annual Report Daily use with > 500,000 ft inspected in 7 months City Council has approved the purchase of 48 units over 4 years, first 12 delivered in November 2013 This technology will revolutionize the way we do cleaning
18 CHARLOTTE, NC Charlotte Mecklenburg Utilities Goal: Improve Cleaning Efficiency Approach: Acoustic Inspection Directed Cleaning 1000ft SL-RAT Assessment Blocked (0) Poor (1 6) Clean (6 10) Effectiveness: 52,000 ft Basin 30,000 ft Assessed by SL- RAT as Clean 22,000 ft Below Threshold & Cleaned 58% Cleaning Reduction
19 CHARLOTTE, NC You can see immediately what needs to be cleaned, so it takes the guesswork out and focuses your efforts. CharMeck Engineer Goal: Prep Downtown Charlotte, North Carolina prior to DNC Approach: Use SL-RAT to quickly identify/prioritize cleaning needs for crews Effectiveness: 2 SL-RAT crews inspected 143k ft of pipe in ~ 2 weeks Saved $100k + versus traditional approach Focused on 10-15% of pipes that are the most blocked & prioritized the remainder
20 Founded 1822 AUGUSTA, GA Combined operations with Richmond County in 1996 Population Served 190,000 1,040 miles of sewer pipe Covers 280 square miles Under GA EPD Consent Order
21 AUGUSTA, GA Using SL-RAT since February 2013 Currently using 2 devices 4,500 segments inspected Over 1 million feet of pipe (197 miles)
22 AUGUSTA, GA Histogram of Acoustic Scores % Poor 22% Fair 61% Good # Acoustic Score
23 VIRGINIA BEACH, VA 1,200 miles of gravity sewer mains Hot Spot program created in 2006 to reduce SSOs Cleaning cycles range from 30 days to 1 year Current program includes 813,000 ft 68,000 ft need cleaned per month
24 VIRGINIA BEACH, VA 4 month pilot study 62 segments (30, 60, 90 day cycles) Total of 112 inspections performed
25 VIRGINIA BEACH, VA Hot Spot Pilot Study Histogram of Acoustic Scores % Poor 11.6% Fair % Good 35 # Acoustic Score
26 APPLICATION OF ACOUSTIC INSPECTION Application Area Pre-Cleaning Assessment Condition Surveys Cleaning Interval Determination Post-cleaning QA Optimize SSES Contract Resources Performance-Based Contracting Condition Based Maintenance Program How to Use Acoustics Prioritize/focus cleaning often see >50% cleaning reduction focus on cleaning the dirtiest pipes Quickly & economically assess large areas for asset management & planning Only clean specific segments when below blockage threshold Low-cost method to check cleaning effectiveness and prevent downstream SSO s Use acoustics to prioritize pre-cleaning & camera resources for contract advantage Use acoustic inspection to enable SSO targets in cleaning/inspection contracts The holy grail economics of acoustics enables a CBM strategy to focus maintenance activity QUICK HITS FULL POTENTIAL
27 CONCLUSION Inspection is much Cheaper than Cleaning Acoustic Inspection is an Effective Method to Make Blockage Assessments o Quick o Cheap o Easy / Safe Acoustic Inspection Enables CBM Capability Acoustic Inspection Does Not Replace Cleaning or Detailed Inspection o Helps Determine how to Effectively Deploy Cleaning and CCTV resources
28 QUESTIONS? 877-PIPECHK ( )
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