Brian Thorogood – Envirologics
Dr. Rizwan Younis ‐ University of Waterloo
TRENCHLESS TECHNOLOGY ROADSHOW
May 28-29, 2014 – Scotiabank Convention Centre, Niagara Falls, ON
Our municipal water pipes are reaching the end of their useable lives
Tuberculation found in metal water distribution pipes
Cities in North America may have 100s of kilometers of these aging, congested pipes
Why should we care about the condition of these pipes?
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Main breaks, service outage
Damage to infrastructure Poor water quality Reduced fire flows
Increased energy costs to pump water through pipes
Good News: Trenchless linings offer cost‐effective renewal solutions
They are required to extend the life of the pipe for several
decades
However, these solutions require that you first clean and prepare the pipe for lining
Current Cleaning Methods ‐ AWWA M28
Foam Pigs
Drag Scraping
Water Jetting
Power Boring
Current Cleaning Methods – AWWA M28
Challenges:
• Foul a lot of clean water and generate wet waste
• Current methods can damage services connections, joints and pipe wall
• Often slow to achieve results, requiring multiple passes
• Linings such as coal tar or bitumen may not be fully removed
• Pipe may be cleaned but not fully prepared for liner bond
Clean and Prepared Pipe is Desired Result
Left – cleaned pipe
Right – cleaned and prepared, ready for liner bond
• Proper cleaning and preparation helps to prevent liner leaks and structural failures
• Clean – reduces stress concentration points in liner
• Prepared – high degree of surface cleanliness and dryness to ensure liner bonding to pipe wall Tomahawk™ System – A Novel Solution
Standard vacuum truck
Patent‐Pending Tomahawk™ System
In‐ground watermain
up to 450’ long
Video link
Advantage
Fast, Dry, Bonded
• Removes tuberculation and old bitumen or coal tar linings • Waterless, dust‐free process • Dries the pipe for immediate bonding
• Faster and more efficient than drag scraping, power boring or water jetting • Target cleans service connections for superior bonding
Trenchless Rehab
 Small 4’ x 8’ pits to access underground pipe
 Minimal surface disruption over “dig and replace”
Small 4’ x 8’ access pits
Pipe Preparation
Concurrent Cleaning, Drying and Inspection
• After cleaning, the Tomahawk Scout™ is instantly deployed without connection changeover to help inspect and prepare the pipe
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Airstream driven, integrated CCTV camera and abrasive deflector Pipe Preparation Using Tomahawk Scout™
① Target clean along pipe, at joints, around service connections
② Draw (vaculate) pooled water and debris from joints
and crevices
③ Vaculate trapped water or debris from service connections
Check out envirologics.ca for actual video
Proven Capability
• Pipe cleaned and prepared in USA and Canadian municipalities
• Same Day Return to Service
• 4” to 8” diameter pipe
• Up to 450 feet
• 30% tuberculation
• 45° elbows
Pilot Projects Results:
Removes Corrosion and Coal Tar Lining
Removes Tuberculation and Bitumen Lining
(same day return to service)
Removes Tuberculation From Unlined Pipe
(same day return to service)
“The Tomahawk is an effective trenchless system that quickly removes tuberculation and bitumen lining from cast‐iron pipes. The pipe is left clean and dry, ready for lining.”
John Campbell, City of Saint John Engineering
Advantage – Same Day Return to Service
No costly service bypass piping save up to 30% of project cost
Minimal surface disruption, short duration
reduces inconvenience to residents
Reduction in project timeline
no bypass piping setup, disinfection, approval, operation and teardown
MOE will be publishing an interpretative document that will include a statement that rehabilitated watermains can be reinstated under a boil water advisory following disinfection according to AWWA C651. This will open the door for “same day return to service” in Ontario – to be issued summer of 2014 (OWWA Conference, London on May 5, 2014)
Developing Capability
Although the Tomahawk cleaning system is commercially available in 2014, Envirologics is committed to ongoing development
• 250mm (10 ”) to 300mm (12”) diameter pipe sizes
• > 30% tuberculation
• Cleaning hydrant laterals
• Cleaning and drying asbestos cement pipe – stop by booth #30 to discuss
• Integrated airborne polymer lining
The Future – Tomahawk Airborne Lining
Inject lining material into airstream
The Future – Tomahawk Airborne Lining
Research Partnership
Phase 1 Project (2012 – 13)
• Possible Influence Factors (operational parameters)
• Pipe diameter, pipe length, geometric and physical features (bends, appurtenances, etc.)
• Temperature, airflow pattern, air pressure, volume and moisture ratio
• Crushed stone (shape, size, etc.)
• Ultimate Objective: Optimization of Operational Parameters
• Phase 1: Develop and test an instrumentation system to measure some of the above parameters
Instrumentation of the Pipe Cleaning Technology
• RH Sensors • Pressure Transducers
• Thermocouple
• Pitot tube
• Data Acquisition System
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Field Testing of the Instrumentation System
Field Testing
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Field Testing
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Pilot Project – City of Cambridge
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Pilot Project – Lab testing
Flexural Test
Tensile Test
Bond Strength
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Novel Water Technology for Liveable Communities
• Three year project (2014 – 17) • Optimize the Tomahawk cleaning, preparation and airborne lining process and to develop liner design and quality standards
• The City of Waterloo will host the beta site
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Task 1: Pipe Cleaning Technology
• Parametric Analysis (Dr. David Johnson, Mechanical and Mechatronics Engineering)
• Flow of aggregates in air stream
• Wind tunnel testing
• Development/modification of uWaterloo test facility
• Improved deflector and camera system
• Modifications to data acquisition system based on the analysis of field operational data
• Field validation
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Task 2: Development of an in Air Stream Polymeric Lining System
• Develop Polymeric and Urethane Linings
• uWaterloo test facility to develop application method and system
• Field Trials
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Task 3: Development of in‐service performance needs
• Liner Design Tool • Lab and Field Test Program
• QA/QC Procedures
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Task 4 – Numerical Simulations for Scout Deflector and Camera Design
• Literature and state of practice review
• Improve camera system
• Development of uWaterloo test facility
• Wind tunnel testing
• Field trials and testing
envirologics.ca
Phone: (800) 267‐9810