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FELL
Electro-Scan One-step Sewer Leak Detection & Location |
| WERF
Report on FELL-41 Electro-Scan: The report: An Examination of Innovative Methods Used in the Inspection of Wastewater Systems, Water Environmental Research Foundation. December 2004. The report may be ordered through the website www. werf.org or www. wef.org. |
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| The report provides a
comprehensive review of the current state of the art investigation
technology for sewers as well as reviewing the needs and current
methods used for pipe condition assessment. An in-depth technology review and field monitoring of FELL-41 is part of the report. FELL-41 sewer Electro-Scan was selected as one of the six innovative gravity sewer test methods for this detailed investigation. Some of the findings of the report were: Applicability …"Electro-Scan can detect service connection problems (tapping problems), leaky offset joints,Objective Results …"The results obtained using the Electro-Scan test are more than qualitative in that they do not require operator interpretation as to whether a leak could occur in a pipe at a particular location. The fact that an electrical current did flow from the pipe and was measured indicates that water can flow into or out of the pipe at this location. The results produce a relative measure of the defect size and can be used in conjunction with the location to establish a probable cause for the leak.". |
Electro-Scan pipe defect
analysis at a glance
Quantitative Prioritization …"The inspection technology is well suited to providing an initial quantitative evaluation of the leak tightness of the pipe system and prioritizing pipe segments for further evaluation."CCTV Comparison …"CCTV inspection methods only identify inflow problems if they occur at the time of the inspection. Likewise, infiltration can only be observed if the water table is sufficiently high above the defect at the time of the inspection to drive water through the defect. Finally, pipe surface below the water level in a flowing pipe cannot be observed using CCTV, so leaks in this region go undetected. The Electro-Scan method will pick up leaks in all of the above situations."Part of Routine Maintenance (Electro-Scan used with) "the sliding plug method can also be used in conjunction with a jet truck and integrated into routine sewer maintenance operations."Validation of Results …"CCTV, smoke testing and joint pressure testing have been used to validate the analysis of the Electro-Scan technology. Results have been validated to show good correlation with pressure testing and smoke testing results. Validation with CCTV also confirmed the results of the Electro-Scan with the Electro-Scan identifying substantially more leak defects than CCTV."Versatility …"The size of the equipment and set up minimize traffic disruption and allows entry into areas with limited space." |