Withybrook, England Project Date: 17-18 December 2013
Electro Scan Project Benchmark Presented to Severn Trent Services Birmingham, England
Report Date: 14 January 2014
Solu ons About CPS Environmental
Tanker Je ng Surveys (cctv & electro scan) Cleaning Drain Repairs Planned Maintenance CPS Environmental (No nghamshire, England) is a diversified sewer cleaning, inspec on, and repair company.
Working with Ant Hire Solu ons LLC (Leeds, England), CPS Environmental is pleased to present this benchmark Electro Scan Project.
CPS Environmental Head Office: Buckthorpe, Oxton Road, Southwell, No nghamshire. NG25 0NH Tel: +44 0 1636 812161, Fax: +44 0 1636 691251
Website: www.cpsenvironmental.co.uk 1 About Withybrook
Withybrook is a rural village and civil parish in the English county of Warwickshire with a popula on of roughly 230 people.
The village is located in a valley just west of the old Fosse Way and forms part of the borough of Rugby.
2 Project Findings
Solu ons
3 Execu ve Summary Project Objec ve Withybrook is an area that has experienced persistent unexplained high flows. Having been televised on mul ple occasions it was a good candidate to test the use of Electro Scan to see if the technology could add value to iden fica on and measurement of sources of infiltra on. Results • Electro Scan not only iden fied a number of poten al sources of infiltra on, not seen by CCTV, but provided an es mated L/S defect flow, ±40% accuracy. • Electro Scan was able to inspect 100% of the lines (23 Sewer Mains + 1 Connec on = 24). By comparison, prior CCTV inspec on recorded six (6) Abandoned Surveys, unable to inspect an average of 29% of the pipe and missing 69% of the sources of infiltra on (p11).
• Total Es mated Leakage of the twenty-three (23) pipes inspected represents 791,187 34.66 l/s, with the seven (7) worst pipe contribu ng 27.67 l/s eighty percent (80%) of the suspected infiltra on (p 9-10).
Way Forward Given Electro Scan’s ability to rapidly (i.e. 10m/minute for ES-150 and 15m/minute for ES-300) iden fy & quan fy sources of infiltra on, it is recommended that Severn Trent considering the adop on of Electro Scan for all pre- CCTV assessments and to require CCTV contractors to visually inspect all major Electro Scan defects as part of any subsequent CCTV survey. Furthermore, given Electro Scan’s ability to detect leaks to within 1 cm, a similar trial is recommended on post-rehabilitated lines, such as lining, point repair, and new pipe construc on, where Severn Trent as previously relied on visual observa on to cer fy project comple on.
4 Findings & Conclusions
1. Quan ta ve Informa on on Flow Poten al – By Electro Scan – Provides Much More Accurate Conclusions Than Visual Observa ons from CCTV Inspec on • Total Es mated Leakage of the twenty-three (23) pipes inspected represents 791,187 gallons per day or 34.66 liters per second (l/s), ±40% accuracy, assuming a 1foot (30.48cm) head and 1% or less pipe slope.
• Seven (7) out of Twenty-Three (23) sewer mains are es mated to contribute 631,504 gallons per day (27.67 liters per second) or eighty percent (80%) of suspected infiltra on into the survey area.
• Two (2) Infiltra on Observa ons on the same pipe segment were iden fied (1-Infiltra on Dripping and 1-Infiltra on Seeping) on Pipe Segment From SP43843403 to SP43843301, with no observa ons of Infiltra on Running or Infiltra on Gushing, represen ng one (1) pipe of twenty- three (23) or 4% of the pilot area.
• Electro Scan iden fied 572 loca ons of poten al infiltra on totaling a leakage poten al of 55.09 GPM (35.01 Liters Per Second).
2. CCTV Overlooked an Average of 64% of the Defects in the Pipe Sec ons Surveyed In extreme cases CCTV missed as much as 92.7% of the defects present in a pipe sec on (Sec on SP43845104 to SP43845103) 5 Findings & Conclusions Con nued 3. Survey Abandonments Seriously Reduce Assessment Accuracy • Forty-two (42) Sewer Main Television Inspec on Reports were Completed or Par ally Completed.
• Twenty-three (23) Main Line Segments and one (1) Service Lateral were 100% Completely by Electro Scan; ie. 100% of All Sewers Were Completely Surveyed, with Zero Abandoned Surveys.
• Out of a total of Forty-Two (42) Television Reports, 23 of 42 - or 55% - of Televised Lines Were Reported as an Abandoned Survey.
• Of the Twenty-Three (23) Lines Electro Scanned, CCTV Reported Six (6) - or 26% - Abandoned Surveys ranging from as li le as 1.24% to as much as 88% of pipe sec on length le un-surveyed by CCTV due to abandonment.
• For the six (6) lines that were televised and reported an ‘Abandoned Survey,’ reverse set-ups were a empted; i.e. CCTV a empted from both Upstream & Downstream Manholes, but 29% of the total pipe lengths were never evaluated.
• Of the sec ons of pipe NOT televised due to Abandoned Surveys, 26 Flow Defects (i.e. defects registering an es mated resultant flow) were iden fied by Electro Scan.
• On average, those por ons of the pipe sec on NOT televised due to Abandoned Surveys contained 63% of the whole pipe length’s infiltra on poten al, despite being only 29.44% of the pipe’s total length. 6 Findings & Conclusions Con nued Those por ons of the pipe which go 'un-surveyed' due to Abandoned Surveys, are cri cal points of infiltra on poten al and this a significant por on of the assessment of a pipes cri cality is missed when surveys are abandoned. By providing quan ta ve data with 0 survey abandonments Electro Scan is much be er suited to assess a pipe's cri cality and infiltra on poten al. Given that 55% of all CCTV surveys in this sub-basin reported abandoned surveys, a very significant amount of data is likely missing from the analysis of this por on of the network. Electro Scan does not replace CCTV, as Electro Scan neither locates defects to a specific clock posi on, or is able to iden fy pipe sags or alignment problems. However, Electro Scan does confirm the limited use of television inspec on to find sources of pathways to ground, i.e. infiltra on, automa cally and without the drawbacks of visual observa ons. By loca ng anomalies to the closest 1 cm (0.4 in) recording data at the rate of one (1) data point, every ¼ inch, i.e. every 14 milliseconds, Electro Scan can accurately locate and measure defects in non- conduc ve pipes (e.g. asbestos cement, brick, clay, plas c, reinforced concrete, resin, etc.) in accordance with ASTM F2550-13.
Recommended uses of Electro Scan include the ability to: • Iden fy and measure all sources of infiltra on from cracks, bad joints, and defec ve service connec ons, • Rank & priori ze sewer mains and laterals that should be repaired, relined, or renewed, • Integrate with hydraulic modeling programs to re-calibrate model assump ons based on its es mated liters per second (l/s) of flow from defects, • Cer fy point repairs, relining, and new construc on to ensure that projects performed by third-party contractors are delivered without defects or leaks, prior to Acceptance. While Electro Scan may not be able to dis nguish whether leaks are occurring at a service connec on or internal to a service lateral, it will consistently iden fy gaps allowing electrical current to pass from inside the sewer system to ground. 7 8 9 10 11 12 CCTV Surveys All CCTV Reports were completed in accordance with Severn Trent standards following the most recent published WRc guidelines for visual observa ons.
NOTE: Given the number of significant defects found by Electro Scan, it is recommended that all prior CCTV repor ng for Withybrook be reviewed to determine consistency of observa ons, and that Electro Scan defects be reviewed side- by-side with CCTV to determine whether observa ons were either missed, obscured due to Debris or Fats, Oils, and Grease, or not able to be visually detected, i.e. at joints. 13 14 Electro Scan Surveys All Electro Scan Reports were completed in accordance with ASTM F2550-13 Standard Prac ce for Loca ng Leaks in Sewer Pipes By Measuring the Varia on of Electric Current Flow Through the Pipe Wall. h p://www.astm.org/Standards/F2550.htm
15 16 17 Withybrook Sewer Plan
18 Electro Scan Project Work Produc vity What is Electro Scan? 1. What Does Electro Scan Do, That CCTV Cannot? Answer: Find sources of infiltra on and cracks. Infiltra on is a key factor causing Sanitary Sewer Overflows (SSOs) and Combined Sewer Overflows (CSO) caused by cracks & defects found in manholes, sewer mains, service connec ons, and laterals. Given the limita on of CCTV – i.e. not able to visually find leaks -- Electro Scan automa cally finds , locates, and measures (i.e. in gallons per minute) the amount of infiltra on (i.e. in gallons per minute) caused by defects. Electro Scan can also cer fy newly installed, recently repaired and rehabilitated pipe lining.
2. How Does It Work? Sewers are made of non-conduc ve materials (e.g. asbestos concrete, brick, clay, cement, plas c, reinforced concrete, etc.), so no electrical current should ever be able to “leak” or escape into the ground from inside the pipe – unless, of course, there is a crack or break in a pipe. Electro Scan’s patent-pending technology releases a focused array of low-voltage high- frequency electrical current that locates and quan fies all defects.
3. Who Has Endorsed or Used Electro Scan? Electro Scan has been tested in Electric “Spikes” Show numerous U.S. EPA studies and found superior to CCTV in finding the loca on and Defect Loca ons, Intensity & Es mated quan fica on of defects that cause leaks. Electro Scan is the only company with Gallons per Minute. products in compliance with ASTM Standard F2550-06, just approved for another five years by ASTM Commi ee F36. Winning interna onal acceptance, Electro Scan has recorded nearly 1 million feet of scans in the U.S., England, Australia, and New Zealand, and represents the next genera on in defect loca on and cer fica on of pipeline repairs & rehabilita on, able to work in wet weather and dry weather condi ons. 20 How Electro Scan Finds Defects Missed By Tradi onal CCTV Inspec on?
Electro Scan Field Data Immediately Uploaded, Processed, Stored, & Displayed.
21 Within Minutes, Data Uploaded to Cloud.
Office Upload if WIFI is Not Available in the Field
Scan Detail Report Authorised Electro
Scan Contractor Withybrook Project
Fire Wall Password, Protected Severn Trent Account
Electro Scan Data Stored on UK-based Cloud Server
Electro Scan From SPSP43843403 To SP43843301
22 Within Minutes, Data Uploaded to Cloud.
Defect Counts Es mated Total Defect Flows.
Tabular Data Available for Export
Scan Graph for Visual Reference*
* Average 100 meters of scanning may provide 15-20,000 data points. 23 Zoom Feature
24 Cri cal Sewers algorithms calculates the Es mated Defect Flow in L/S (GPM)
But, How Does This Compare to CCTV?
25 SP43843403 to SP43843301 Electro Scan vs. CCTV Side-by-Side
Medium Defect Es mated Flow: 0.0625 LPS
Crack Circumferen al From 07 to 05 O’Clock
26 How Electro Scan Es mate L/P? While Electro Scan’s standard graphs display the Maximum Defect Current, Electro Scan’s es mated Liters per Second (Defect Flow) is based on the Defect Area and the Electric Current sustained over that Area.
Sample Processed Data ‘Large Current Readings over a Large Area’ o en result in a large l/p or Defect Flow, frequently found in defects at a service connec on. In other cases ‘Large Current Readings over a Small Area’ result in small and medium LPS, frequently showing defects at joints.
Electro Scan measures height and width of defect in accordance with F2550-13. 27 Sewer Mains Laterals ES-300 6-60” Diameter Pipes ES-150 3-8” Diameter Pipes
Android
Large Diameters ES-1000 5-10’ Diameter Pipes REQUIRESES-300
US and Interna onal Patents pending. 28 Awards & Recogni on • Finalist, Europe’s GreenTec Award for Water & Sewage (Announced May 2014) • The New Economy Clean Tech Award for Water & Wastewater Solu ons, December 2013 • PURE Award for Innova on, South West Water, UK, November 2013 • WEF Innova ve Technology Award, October 2013 • Sierra Nevada Innova on Challenge Clean Tech Award, June 2013 • NASTT/No-Dig Joseph L. Abbo Jr., Award for Best Product Innova on, March 2013
29 Recent Nomina on
30 30 Withybrook Sewer Main Assessments
Solu ons
31 1 SP43845501 to SP43845401
• 150mm Diameter • Vitrified Clay Pipe 32 CCTV Scan Graph vs. CCTV SB43845501 to SP43845401
33 SP43845501 to SP43845401 Defect Chart
SP43845501 to SP43845401 Scan Summary
34 2 SP43845401 to SP43845402
• 150mm Diameter • Vitrified Clay Pipe 35 CCTV Scan Graph vs. CCTV SP43845401 to SP43845402
36 SP43845401 to SP43845402 Defect Chart
SP43845401 to SP43845402 Scan Summary
37 3 SP43845402 to SP43845301
• 150mm Diameter
• Vitrified Clay Pipe 38 CCTV Scan Graph vs. CCTV SP43845402 to SP43845301
39 CCTV Scan Graph vs. CCTV Cont’d SP43845402 to SP43845301
40 SP43845402 to SP43845301 Scan Graph vs. CCTV Close Up
Electro Scan: - Medium Defect Es mated Flow: 0.03667 LPS
CCTV: - No Call Out
41 SP43845402 to SP43845301 Defect Chart
SP43845402 to SP43845302 Scan Summary
42 4 SP43845301 to SP43845302
• 150mm Diameter • Vitrified Clay Pipe 43 CCTV Scan Graph vs. CCTV SP43845301 to SP43845302
44 SP43845301 to SP43845302 Defect Chart
SP43845301 to SP43845302 Scan Summary
45 5 SP43845302 to SP43845303
• 150mm Diameter • Vitrified Clay Pipe 46 CCTV Scan Graph vs. CCTV SP43845302 to SP43845303
47 SP43845302 to SP43845303 Defect Chart
SP43845302 to SP43845303 Scan Summary
48 6 SP43845303 to SP43844201
• 150mm Diameter • Vitrified Clay Pipe 49 CCTV Scan Graph vs. CCTV SP43845303 to SP43844201
50 SP43845303 to SP43844201 Defect Chart
SP43845303 to SP43844201 Scan Summary
51 7 SP43844201 to SP43844202
• 150mm Diameter • Vitrified Clay Pipe 52 CCTV Scan Graph vs. CCTV SP43844201 to SP43844202
53 SP43844201 to SP43844202 Defect Chart
SP43844201 to SP43844202 Scan Summary
54 8 SP43844202 to SP43845201
• 150mm Diameter • Vitrified Clay Pipe 55 CCTV Scan Graph vs. CCTV SP43844202 to SP43845201
56 SP43844202 to SP43845201 Defect Chart
SP43844202 to SP43845201 Scan Summary
57 9 SP43845201 to SP43845104
• 150mm Diameter
• Vitrified Clay Pipe 58 CCTV Scan Graph vs. CCTV SP43845201 to SP43845104
59 SP43845201 to SP43845104 Defect Chart
SP43845201 to SP43845104 Scan Summary
60 10 SP43845104 to SP43845103
• 150mm Diameter • Vitrified Clay Pipe 61 CCTV Scan Graph vs. CCTV SP43845104 to SP43845103
62 SP43845104 to SP43845103 Defect Chart
SP43845104 to SP43845103 Scan Summary
63 11 SP43845003 to SP43845103
• 150mm Diameter • Vitrified Clay Pipe 64 CCTV Scan Graph vs. CCTV SP43845003 to SP43845103
65 SP43845003 to SP43845103 Defect Chart
SP43845003 to SP43845103 Scan Summary
66 12 SP43845103 to SP43845102
• 150mm Diameter • Vitrified Clay Pipe 67 CCTV Scan Graph vs. CCTV SP43845103 to SP43845102
68 SP43845103 to SP43845102 Scan Graph vs. CCTV Close Up
Electro Scan: - Small Defect Es mated Flow: 0.0095 LPS
CCTV: - No Call Out
69 SP43845103 to SP43845102 Defect Chart
SP43845103 to SP43845102 Scan Summary
70 13 SP43845102 to SP43845101
• 150mm Diameter • Vitrified Clay Pipe 71 CCTV Scan Graph vs. CCTV SP43845102 to SP43845101
72 SP43845102 to SP43845101 Defect Chart
SP43845102 to SP43845101 Scan Summary
73 14 SP43845101 to SP43845105
• 150mm Diameter • Vitrified Clay Pipe 74 CCTV Scan Graph vs. CCTV SP43845101 to SP43845105
75 SP43845101 to SP43845105 Defect Chart
SP43845101 to SP43845105 Scan Summary
76 15 SP43845001 to SP43845105
• 150mm Diameter • Vitrified Clay Pipe 77 CCTV Scan Graph vs. CCTV SP43845001 to SP43845105
78 SP43845001 to SP43845105 Defect Chart
SP43845001 to SP43845105 Scan Summary
79 16 SP43846101 to SP43845001
• 150mm Diameter • Vitrified Clay Pipe 80 CCTV Scan Graph vs. CCTV SP43846101 to SP43845001
81 SP43846101 to SP43845001 Scan Graph vs. CCTV Close Up
Electro Scan: - Medium Defect Es mated Flow: 0.2517 LPS
CCTV: - No Informa on Survey Abandoned Due to Debris
82 SP43846101 to SP43845001 Defect Chart
SP43846101 to SP43845001 Scan Summary
83 17 SP43846001 to SP43846101
• 150mm Diameter • Vitrified Clay Pipe 84 CCTV Scan Graph vs. CCTV SP43846001 to SP43846101
85 SP43846001 to SP43846101 Scan Graph vs. CCTV Close Up Electro Scan: - Large Defect Es mated Flow: 5.22 LPM - Medium Defect Es mated Flow: 0.0625 LPS
CCTV: - No Call Out
86 SP43846001 to SP43846101 Defect Chart
SP43846001 to SP43846101 Scan Summary
87 18 SP43843501 to SP43843401
• 150mm Diameter • Vitrified Clay Pipe 88 CCTV Scan Graph vs. CCTV SP43843501 to SP43843401
89 SP43843501 to SP43843401 Defect Chart
SP43843501 to SP43843401 Scan Summary
90 19 SP43843401 to SP43843402
• 150mm Diameter • Vitrified Clay Pipe 91 CCTV Scan Graph vs. CCTV SP43843401 to SP43843402
92 SP43843401 to SP43843402 Scan Graph vs. CCTV Close Up Electro Scan: - 2 Medium Defects Es mated Flows: 0.6057 LPS & 0.036 LPS
CCTV: - Crack Longitudinal@ 11 O’Clock
93 SP43843401 to SP43843402 Defect Chart
SP43843401 to SP43843402 Scan Summary
94 20 SP43843402 to SP43843403
• 150mm Diameter • Vitrified Clay Pipe 95 CCTV Scan Graph vs. CCTV SP43843402 to SP43843403
96 SP43843402 to SP43843403 Scan Graph vs. CCTV Close Up
Electro Scan: - Small Defect Es mated Flow: 0.017 LPS
CCTV: - No Call Out
97 SP43843402 to SP43843403 Defect Chart
SP43843402 to SP43843403 Scan Summary
98 21 SP43843403 to SP43843301
• 150mm Diameter • Vitrified Clay Pipe 99 CCTV Scan Graph vs. CCTV SP43843403 to SP43843301
100 SP43843403 to SP43843301 ELECTRO SCAN v. CCTV INSPECTION
Electro Scan: - Small Defect Es mated Flow: 0.0625 LPS
CCTV: -Crack Circumferen al From 07 to 05 O’Clock
101 SP43843403 to SP43843301 Defect Chart
SP43843403 to SP43843301 Scan Summary
102 22 SP43843301 to SP43844301
• 150mm Diameter • Vitrified Clay Pipe 103 CCTV Scan Graph vs. CCTV SP43843301 to SP43844301
104 SP43843301 to SP43844301 Defect Chart
SP43843301 to SP43844301 Scan Summary
105 23 SP43844301 to SP43844201
• 150mm Diameter • Vitrified Clay Pipe 106 CCTV Scan Graph vs. CCTV SP43844301 to SP43844201
107 CCTV Scan Graph vs. CCTV Cont’d SP43844301 to SP43844201
108 SP43844301 to SP43844201 Scan Graph vs. CCTV Close Up
Electro Scan: - Medium Defect Es mated Flow: 0.02017 LPS
CCTV: - No Call Out
109 SP43844301 to SP43844201 Defect Chart
SP43844301 to SP43844201 Scan Summary
110 Withybrook Private Sewer Lateral Assessment
Solu ons
111 24 C4 to SP43845003
• Not A Main Line – A Connec on • 100mm Diameter
• Vitrified Clay Pipe 112 C4 to SP43845003 Scan Graph
113 C4 to SP43845003 Defect Chart
C4 to SP43845003 Scan Summary
114 Supplemental Informa on
Solu ons
115
any me, anywhere global cloud Electro Scan Data Export
116 • Real Time Data Capture • Raw, Unprocessed Data • 1 Data Point, Every ¼ in, every 14 milliseconds • Visual Studio 2012, .NET 4.5, C#, LINQ • SQL Server 2008R2 Backend Database
• Global Service – Any me, Anywhere • Amazon S3 Pla orm • Unlimited Scalability • Receives Uploaded Data from the Field
• Five (5) 64-bit Electro Scan Cloud Servers • Windows SQL Server 2012, Hosted Tableau • Web Services, C# Programming • Database Retrieval, Processing, and Storage
• HTML 5.0 • Python • PHP • Embedded Tableau
117 Hall B-5
Hall B5, Booth #111-120
World’s Leading Trade Fair for Water, Sewage, Waste & Raw Materials Management
May 5-9, 2014 Messe München www.ifat.de See Our European Demonstra on Van 118 References 1. US EPA Sewer Electro Scan Field Demonstra on Revisited, Special Reprint from 2012 WEFTEC Conference Proceedings h p://www.electroscan.com/wp-content/uploads/2012/11/WEFTEC_US- EPA-Electro-Scan-Demonstra on-Project.pdf
2. ASTM Standard F2550-13 h p://www.electroscan.com/wp-content/uploads/ 2012/01/2006-02-01-Electro-Scan_ASTM-Standard- F2550-06.pdf
3. Electro Scanning Technology Adds Another Layer of Inspec on, Trenchless Technology Magazine, Published February 2013 h p://www.electroscan.com/wp-content/uploads/2013/03/Trenchless- Technology-Mag_ES-Tech-Adds-Another-Layer-of-Inspec on.pdf
4. Electro Scan Technology Test Drive, Municipal Sewer &Water Magazine, December 2012 h p://www.electroscan.com/wp-content/uploads/2012/11/Electro- Scan_Technology-Test-Drive.pdf
5. Electro Scan Newspapers h p://www.electroscan.com/newspapers/
119