This ad will close in 15 sec
Tags
Locating, Inspection

Surrey solves I&I mysteries with electrical pipe scanning system

ES-620 probe for sewer mains and grounding reel, ready to start scanning.
ES-620 probe for sewer mains and grounding reel, ready to start scanning.

With municipal proposal requests being issued throughout the United States, from Miami- Dade County (Miami, FL) to East Bay Municipal Utility District (Oakland, CA), and having just won the United Kingdom Society for Trenchless Technology’s “Best Project – Small Scheme” Award in April, 2015, it became clear that Electro Scan projects have been growing in demand across the globe – so much so that Electro Scan Inc. opened two new offices – one in London, England and one in Toronto, Ontario. In its first month, Electro Scan Canada Ltd. performed six live demonstrations throughout the Greater Toronto Area at the request of local agencies.

The demand for the low-voltage inspection system that locates and measures (in litres per second) estimated potential peak infiltration flows in pre- and postcured- in-place pipes (CIPP) has not come as a surprise to many. In accordance with ASTM F2550-13, Electro Scan’s products detect faults typically not seen by closedcircuit television (CCTV) cameras or heard by acoustic sensors, allowing engineers and directors to find and quantify defects in drains that typically go undetected. The results provide decision-making information for rehabilitation planning and certification of rehabilitation projects.

This was the case with the recent Electro Scan project in the City of Surrey, British Columbia. Surrey has one of the largest sanitary sewer systems in B.C., serving approximately 130,000 customers with over 1,500 kilometres of sewer pipes ranging in diameter from 150 mm to 1,200 mm. Surrey, like many cities, has issues with inflow and infiltration (I&I) stemming from aging infrastructure. Surrey selected 2.2 km of sewer near their city centre, and looked to Electro Scan technology to provide quantitative data regarding their infiltration issues. Due to inconsistent CCTV inspections and rehabilitation efforts that didn’t seem to be working, Surrey had Electro Scan evaluate 27 sewer mains and 65 private sewer laterals.

The Electro Scan probe releases a focused array of low-voltage high-frequency electrical current, of only 10 volts and 40 milliamps, which automatically locates and quantifies all defects in non-conductive sewer mains and laterals.

Most sewer pipe materials are electrical insulators. A defect in the pipe that leaks water will also leak electrical current. For a constant applied voltage, the larger the defect, the greater the electric current that will pass through the pipe wall. This is also the case for water; for a given water pressure, the larger the hole, the greater the flow.

Since sewer pipe materials are generally asbestos cement, brick, clay, concrete, plastic and reinforced concrete (i.e. all non-conductive materials that naturally prevent electricity from passing through or along the wall of a pipe), no electrical current should ever be able to “leak” or escape from inside a pipe, unless there is a crack or break in a pipe.

As the Electro Scan probe passes through the pipe, it measures the variation of electric current flow through the pipe wall, then through the ground to an electrode on the surface – a metal stake driven into the ground.

Taking an electrical measurement every 14 milliseconds, the data is transmitted back up the CCTV truck’s cable and reel, and then to the Electro Scan controller. There, the data is synched and delivered to the truck’s on-board PC which records all the data and operates the system via Electro Scan’s desktop application software. Once a scan is complete, the software then sends the scan’s “raw data” to the web-based processing and viewing platform, where it is automatically post-processed, quantified and displayed to anyone who has an account for that particular project or client. Additionally, an estimated litres per second (l/s) potential peak infiltration rate is assigned to each of the defects, and then the pipe, as a whole.

The scanning of the 2.2 km of pipe took four days. In the 27 sewer mains, Electro Scan was able to locate 801 defects with a combined estimated potential infiltration flow of 23.53 l/s. The single worst sewer main segment measured potential infiltration flows of 4.0 l/s or 17 percent from all sewer mains. In the worst pipe segment, Electro Scan detected 94 places where water was able to escape the pipe wall, where CCTV operators were only able to call out two defects. Additionally, Electro Scan determined that the 10 worst sewer mains were responsible for 16.6 l/s or 71 percent of the estimated potential peak infiltration from the 27 mains evaluated.

Electro Scan evaluated 65 sewer laterals and found 254 defects that measured an estimated potential peak infiltration of 5.4 l/s. Of the 65 laterals that were evaluated, the 15 worst sewer laterals were responsible for 4.8 l/s or 91 percent of the estimated potential peak infiltration.

A total of 1,055 defects were discovered, with a total estimated potential peak infiltration flow of 28.8 l/s. The sewer mains were responsible for 81 percent and laterals for 19 percent of this potential peak infiltration. If the City addresses the 10 worst sewer mains and 15 worst laterals based on these estimated infiltration flows, total potential infiltration would be reduced by 74 percent, while only rehabilitating 37 percent of the sewer mains and 23 percent of the laterals evaluated.

Surrey’s Engineering Department is currently using these results to develop and implement a cost-effective rehabilitation program based on quantified defect flows. Meanwhile, cities throughout the Greater Toronto Area are putting together their own pilot projects to be completed in fall, 2015.

  • An Electro Scan technician with the ES-38 for sewer laterals and plug, scanning private laterals in Surrey, BC.
    An Electro Scan technician with the ES-38 for sewer laterals and plug, scanning private laterals in Surrey, BC.

Company Info

Related News

Tags
Locating, Inspection

Montreal-based consultancy completes inspection and leak detection of six 1,200-mm steel watermains and one 1,500-mm PCCP main in Montreal

ROV command centre.

Since September 2013, GAME Consultants has been paving the way for the next generation of watermain condition assessment tools by using existing tools and working to improve the results with every project. The company’s position is to equip itself with a wide range of tools designed exclusively for use in watermains.

Read More

Sponsored Content

Are all excavators the same?

Among the top brands, many believe all excavators are the same. But when you look closely, you can spot the small differences in design that add up to huge differences in productivity and efficiency — differences that can boost your profitability. 


Read More

Tags
Locating, Inspection

B.C. robotics manufacturer working with Seatronics to supply ROV

Seatronics is working with Inuktun to supply the Inuktun ROV Manipulator as a standardised option for the Seatronics Predator ROV Elite System.

Seatronics, an Acteon company, and market leaders in the rental and sale of marine electronic equipment, has announced a collaboration with Canadian-based manufacturer, Inuktun Services Ltd. Inuktun has extensive expertise in remote controlled robotic transport and delivery of multi-mission, modular technology used in hazardous environments and confined spaces.

Read More

Tags
Locating, Inspection

Addressing the challenges of inspecting corrugated metal pipe

In the city of Levis, Quebec, one section of a storm water drainage system comprised of corrugated metal pipe was identified as high concern. After a visual and acoustic assessment, two anomalies were chosen for BCT imaging.

Corrugated metal pipe (CMP) is heavily reliant on supporting soil for structural integrity. As such, a condition assessment must include an evaluation of the supporting soil to be considered complete. Previously there was no conclusive and quantifiable way to assess soil condition without damaging the pipe wall – further compromising the structural condition of the pipe.

Read More

Tags
Locating, Inspection
Tunneling

Robotic inspection goes 1/2-K deep

Cheves Hydropower Tunnel in Peru ended up breaking the ASI company record for the deepest flooded tunnel.

In June, ASI Marine (ASI) personnel conducted a remotely operated vehicle (ROV) underwater inspection of the Cheves Hydropower Tunnel in Peru and ended up breaking the ASI company record for the deepest flooded tunnel inspection at 570 metres water depth. The Cheves Hydropower Project is being developed by Empresa de Generacion Electrica Cheves S.A., a wholly-owned subsidiary of Statkraft, a Norwegian electricity company.

Read More

Tags
Locating, Inspection

Deep Toronto fibre project demands robust video inspection equipment

Advance Underground outfitted a cargo van with RST’s inspection equipment, including transporter, pan-and-tilt camera, and 1,500-foot operating cable.

When Arno Électrique Ltée. of Trois Rivieres, Quebec sought a contractor to perform pre-installation video inspection of PVC conduit piping before they could place fibre optic cable for a new Toronto hydro-electric station, their options were limited. Their customer, Hydro One, had presented a challenging project, whose demands few inspection providers would be able to meet.

Read More

Tags
Locating, Inspection

Multi-sensor inspection robot shows benefits of pipe penetrating radar

The SewerVUE Surveyor is the first commercially-available inspection robot to use CCTV, LIDAR and PPR to inspect underground pipes.

Pipe penetrating radar (PPR), the in-pipe application of ground penetrating radar (GPR) is one of the most promising quantitative pipe condition assessment technologies to emerge in recent years. With most of the underground pipe infrastructure reaching the end of their design life there is a need to provide measurable data in order to establish the extent of rehabilitation required or the timing of replacement for large diameter critical pipe lines.

Read More

Tags
Locating, Inspection

Researchers use unmanned aircraft to inspect energy pipeline route

Aerial inspection of energy pipelines is federally required in the U.S. and typically performed using manned aircraft flying at low altitudes. If validated, unmanned aircraft technologies can potentially reduce risks to pilots and the public.

The first Mid-Atlantic Aviation Partnership at Virginia Tech test flight using a fixed-wing unmanned aircraft to inspect an energy pipeline route – with a piloted chase plane following behind to ensure safety beyond the ground observers’ sight line – was completed on March 17. The flight was a step toward making aerial inspections of energy pipelines safer and more economical, researchers say.

Read More

Tags
Locating, Inspection

MAINLINE AND LATERAL LAUNCH SYSTEM

MAINLINE AND LATERAL LAUNCH SYSTEM

Perform inspections in 6-inch to 24-inch pipelines from a single integrated unit. Locatable via a built-in 512 Hz sonde, the system features a colour pan and tilt mainline zoom camera, auto upright lateral camera, rear view camera and tilt-up connector. A launch camera actuator allows for easy insertion into 90-degree laterals and the dedicated 90-watt motor produces amazing pushing force for lateral inspections up to 100 feet from the mainline. The six-wheel drive tractor features three forward speeds, reverse and freewheel with speeds up to 70 feet per minute.

Read More

Tags
Locating, Inspection

P350 FLEXITRAX UPDATE

P350 FLEXITRAX UPDATE

The P350 flexitrax system offers inspection professionals a comprehensive and portable crawler system. This advanced and affordable system features the simplicity and transportability of a pushrod system while delivering the functionality and performance associated with complex and expensive crawler systems.

Read More

Tags
Locating, Inspection

JETSCAN MINI VIDEO NOZZLE

JETSCAN MINI VIDEO NOZZLE

Deployed in pipes 6 to 10 inches in diameter, the JetScan Mini video nozzle gives sewer cleaning crews the visual feedback they need to select the proper tools, troubleshoot backups, identify buried safety hazards, and document successful cleaning. This simple, rugged device is affordable enough to put on every cleaning truck, yet captures valuable HD video footage from underground pipes for offline tablet viewing.

Read More

Tags
Locating, Inspection

NEW MPLUS+ XL W/ P&T

NEW MPLUS+ XL W/ P&T

On the heels of the successful launch of the MPlus+ Lateral and Mini-Mainline Push System, CUES has released the new MPlus+ XL with P&T capabilities which offers the most flexible and feature packed mini-mainline push systems on the market, according to the company. The modular design of the MPlus+ XL will now accommodate the most demanding users with P&T capabilities on the new XL Coiler configuration designed for larger pipeline applications up to 500 feet.

Read More

Tags
Locating, Inspection

PANORAMO SI

PANORAMO SI

The PANORAMO SI Manhole Inspection System brings the versatility, speed and data acquisition of the PANORAMO system to downhole inspections. The system features inspection speeds of up to 14 inches per second, 100 percent coverage, geometric measurements from any point inside the manhole, laser depth measurement, 225 feet of cable and capabilities from 10-inch diameter and up. The PANORAMO software allows you to view the manhole from any angle, at any position creating a “virtual-reality” style view of the manhole. This file can be viewed from any computer, anytime. The system also automatically generates a three-dimensional model of the inside of the manhole that can be rotated, viewed, measured, or output to a CAD file for further analysis.

Read More

Tags
Locating, Inspection

Upgraded Lateral Camera System ‘Goes the Distance’

PortaVision 3 one-touch lateral camera system from HammerHead

Whether inspecting pipe laterals for cleaning, repair or inspection, plumbing specialists now have a one-touch lateral camera system that supports a wide range of pipe sizes with a highly durable yet comparatively inexpensive self-contained unit. The 200-foot pushrod capability of the new PortaVision 3 from HammerHead Trenchless Equipment can be increased from its standard system to a 300- or 400-foot capability simply by changing out its premium fiberglass spiral-wound pushrod reels – eliminating the cost of duplicate system components to meet the needs of all jobsite applications.

Read More