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Cleaning

Condition Of Our Watermains 

Tuberculation

Need to clean tuberculation and corrosion deposits out of your drinking water pipes and fire mains prior to lining? The Tomahawk™ System can help you on your pipeline rehabilitation project.

Before
After

A corroded and tuberculated potable water pipe. At right, the same pipe cleaned and prepared by the Tomahawk™ System. This pipe is now clean, dry and ready for liner application.

Bitumen and Tar

Need to clean old bitumen and tar lining materials out of your drinking water pipes? The Tomahawk™ System can do it with ease. Bitumen and tar linings were used in potable water pipes to prevent corrosion.  These materials are still found in pipes throughout North America.

Before
After

A bitumen tar and tuberculated potable water pipe.  At right, the same pipe cleaned and prepared by the Tomahawk™ System.  This pipe is now clean, dry and ready for liner application.

The Tomahawk  Solution

160826 Cleaning Overview

Clean Pipe
Benefit

Clean PipeBenefit
  • Improves drinking water quality
  • Restores water flow rates for potable water and fire fighting
  • Lowers operating costs for distribution networks

Advantage
Fast, Dry, Bonded

AdvantageFast, Dry, Bonded
  • Dust-free, environmentally friendly, trenchless process
  • Uses little to no water, reducing waste by up to 98%
  • Quickly removes tuberculation, biofilms, old bitumen or coal tar linings
  • Best-in-class surface preparation for superior bond and long-term, leak-free performance
  • Dries the pipe for immediate liner application

Proven
Capability

ProvenCapability
  • 100mm (4”) to 300mm (12”) diameter pipe
  • Clean up to 135m (450 feet)
  • Up to 40% tuberculation levels
  • One 22.5° elbow per segment
  • Meets or exceeds surface preparation and bond requirements for ASTM F3182 for SIPP applications

Developing
Capability

DevelopingCapability
  • >40% tuberculation levels
  • Cleaning hydrant laterals
  • Cleaning and drying asbestos cement pipe (cleaning pictures) (AC pipe rehab need - video)
  • Integrated airborne lining, check out our Tomahawk Lining page

Tomahawk™ System Cleaning Stages

2017 Cleaning Stages

Tomahawk™ pipe cleaning and preparation timeline

Click on the left icon below for an overview of the Tomahawk pipeline cleaning and preparation process. Click on the right icon below to view a video showing the trenchless street, without service bypass during Tomahawk cleaning.

Tomahawk System Pipe Cleaning and Preparation
Trenchless Watermain Rehabiltation

Final Inspection Video

Click on the icon below for a short pipe and service connection inspection video following Tomahawk cleaning.  The white cavities seen in the pipe wall are left behind following the removal of graphitic corrosion during cleaning.  This helps to ensure a strong liner bond to the pipe wall. The pipe and service connection are clean, dry and ready to accept liner material.

Pipe and Service Inspection

Why Dry Pipe Cleaning?

  • Municipalities are looking for ways to reduce water consumption, especially in more arid regions.
  • Less mess and waste onsite, improving public perception.
  • Cost savings due to: less water consumption during rehab activities, pipe is dried quickly in preparation for lining, vac truck can stay onsite cleaning pipe all week long without having to dump dry debris. 

Tomahawk - Wet vs Dry

The Importance of Liner Bond

The video below highlights the importance of a strong bond in preventing future leaks. The arrows represent water pressure in a typical water main. Axial forces are a result of moving water. Positive tangential forces are normal. Negative tangential forces can occur when fighting fires or during transient conditions such as when a water hammer event occurs.

Bond Prevents Leaks 1

Third party test results have confirmed that the bond between the liner and host pipe wall exceeds the 250 psi bond strength required by the ASTM F3182-16 "Standard Practice for the Application of Spray-Applied Polymeric Liners Inside Pipelines for Potable Water". The pipe wall was cleaned and prepared up to a SSPC-SP 6/NACE No. 3 equivalent surface by Tomahawk™. The original lining material found in the host pipe was coal tar.  This makes the results even more impressive due to its tenacity towards removal.

ASTM D4541 Diagram
ASTM D4541 Bond
  

ASTM D4541 - Measuring bond strength of liner material to cleaned and prepared host pipe wall.

Additional Resources

For additional information on our Tomahawk™ System such as videos, articles, presentations and brochures, please visit our resources page.

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