Trenchless Pipe Repair - Dynamic Drain


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Fold and Form Pipe Liner vs Inversion Sewer Lining

Fold and Form sewer pipe lining has been used for decades to replace and rehabilitate existing drain lines. The technologies behind fold and form and the inversion lining processes have many similarities.


CIPP pipe repair materialsIn both cases, inversion CIPP and fold and form liners all come pre-manufactured. Prior to installation they are able to be rolled up and stored.

The liner is made up of a felt material on the inside and a coated outer layer. Pipeliners in diameters from 3-inch to 30-inches are coiled into reels that are normally several hundred feel long or more.

The plastic coating on the outside enables the liners to be completely saturated with the epoxies. The resin and epoxy mixture is where the magic happens, when they are activated in side the host pipe, they harden and form a plastic pipe.

The thermoplastic, seamless liner used for trenchless sewer rehabilitation of wastewater pipelines is a structural tight fitting liner that is resistant to gases, chemicals and corrosion.

Plastic pipe has been around for a very long time and polyvinyl chloride or (PVC) has been the preferred fold and form pipeliner material for most of it’s existence.

There is a write-up of the chemicals used in Fold-and-form and for trenchless (“no-dig”) rehabilitation of wastewater pipes by the manufacturer DuPont online here:

So What’s The Difference?

point repair for pull in place and fold and form animationThe Fold-and-form system involves pulling the liner into the sewer in a “folded” shape then forming it back into a circular pipe with the application of heat and pressure. The factory extruded coils of PVC are loaded into a warming trailer and heated until soft. When the liner reaches the right temperature the pipe is winched into place using two different access chambers on either end of the line.

Special injectors are attached to each end of the folded pipes while steam and pressure expand the liner to tightly fit against the host pipe.

The ends of the liner are then trimmed and any connections are re-opened using a robotic cutter and cctv pipe inspection camera.

CIPP Liner repairing wastewater systemThe CIPP inversion lining system uses a slightly similar approach. Instead of folding the liner and winching it into place, the liner is placed inside of either a Perma-Liner inversion unit or for specific jobs an icing tank behind the MaxLiner inversion unit.

The liner is brought through the opening of the inversion machines and attached to the opening of the inverter.

Air pressure is then used to actually invert the liner into the existing pipe. The advantages of this method can be found in the fact that a liner is not dragged into place but it is unrolled inside-out.

The other difference is in the curing process.

calibration tube holding cipp liner in placeInstead of closing both ends and applying pressure to the liner, a calibration tube is inserted into the liner that is already in place inside the pipeline. The calibration tube is expanded using air pressure or circulating hot water to control the curing time.

The calibration tube expands inside of the pipe like a balloon holding the liner against the existing pipes.

The calibration tube method allows for a completely cured-in-place application using only one access point.

This comes in handy when there are confined space limitations, limited access points and risks associated with disruption to end-user communities.

Simplified Sewer Rehabilitation

Both methods of sewer line rehabilitation and pipe replacement have their advantages especially when compared to dig-and-replace methods. While they are both using the same concept, the applications are slightly variated.

Of the 200,000 miles of wastewater (sewer) pipe in need of repair, the need for “fold-and-form” and CIPP “no-dig” trenchless technologies has grown exponentially. It made up about 7% of the total rehabilitation market in the mid 90’s and went up to around 28% in the year 2000.

pipe-rehabilitation-testingThese pipelining materials can be pre made to ensure maximum compliance and meeting material standards. The standardized production of lining materials under a controlled environment is producing a higher quality and lower cost sewer repair sewer rehabilitation revolution.

The use of pre-manufactured parts is becoming key to the modern day field of construction. Parts such as timbers, concrete slabs, beams, columns and electronics are able to be replaced with monitored and tested materials.

Environmental Concerns

The concerns about the environmental impact during and after pipeliner installations has had a big impact on the pipe rehabilitation industry. Current research at the University of Virginia has has stated that pre-manufactured fold-and-form and CIPP liners are “not expected to have any significant adverse environmental impact” and are “environmentally benign”.

The pre-made pvc liners have zero caustic or noxious chemicals. There are no chemicals such as styrene that contain volatile organic compounds or VOC’s that are hazardous to humans and the environment used.

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Benefits of Trenchless Pipe Repair

Our Pipe Repair Technicians at the Capitol Building in Washington DC

Pipes underneath buildings and in other types of structures are an important aspect of every day living.  Underground pipes are used to provide water, remove waste-water and more.  Their importance is never fully realized until something goes wrong.

Broken Sewer Pipes

Pipe Lining at University of VirginiaAfter constant use over a period of time underground pipes can become clogged, crack and become damaged.  They can even be harmed by tree roots.

There was a time when the only method available for fixing these pipes was to dig them up and replace them by hand.

This cost a lot of money and could damage the ground and everything around it.  Doing this would destroy plants, require road repairs, disrupt sidewalks and more.

Trenchless Pipeline Rehabilitation

Now there is trenchless technology.  This is an effective way to deal with the challenges associated with the old digging style technology.

People are finding that trenchless technology is easier when it comes to pipe replacement and repair.

Our Pipe Repair Technicians at the Capitol Building in Washington DCTrenchless pipe repair and replacement does not require any type of digging.  A small hole is made in one end of the damaged pipe.

CIPP inversion lining is attached to replacement piping.  Once the CIPP inversion lining is inside the damaged pipe it expands.

It will then become large enough to fill the area of the damaged pipe.

Replacing Underground Pipes

When pipes underneath roads or in areas with buildings need replaced, trenchless technology can help preserve the infrastructure.

Trenchless technology can eliminate the need to dig up a park’s monuments, company’s building or parking lot.  It will leave everything in place while the pipes below are repaired or replaced.

Benefits of Trenchless Pipe Repair

Pipe lining with perma liner insituform style trenchless pipe repairTrenchless technology is very cost effective.  There are fewer laborers required to install the new piping.

When pipes are dug up using the traditional method, it may take days for the process to be completed.

Trenchless technology only takes a few hours for a full pipe, sewer or drain replacement.  It is a quick and efficient method of pipe replacement that leaves no damage or needed repair work.

Would you like to know more about how trenchless pipe repair can help you?  Contact us today and learn more.

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Three Common Pipe Issues that can be Easily Treated with Trenchless Pipe Repair

pipe repair video inspection step two

If you’ve ever had problems with your property’s sewer pipes, you know just how expensive repairs can be. So if you’re noticing the smell of sewage from drains on your property’s bottom floor, or your water bill is inexplicably higher than usual, these may be signs of a clogged or leaking pipe.

Common Pipe Problems

If you think your pipes may be in need of repair, there are alternatives to digging up your landscape and walkways. Several of the most common pipe problems can be addressed by trenchless pipe repair, including:

pipe repair video inspection step twoCalcification and Scale: Over a pipe’s lifetime, calcification and scale start to build up on the interior lining. This can eventually cause clogs as the buildup starts to restrict or block the flow of water. The continued buildup of calcification and scale indicates the thinning of the pipe’s interior thickness as well.

Waterjetting can clear this buildup from the walls of your pipe, clearing and preventing clogs, as well as extending its service life.

Leaks and Channeling: If your property was built before the 1970s, there’s a good chance it is serviced by a cast iron or Orangeburg pipe, both of which are susceptible to damage and have relatively short lifespans.

Orangeburg pipe deteriorating (fiber pipe)Orangeburg pipes are made of a mixture of wood pulp and tar, and are particularly prone to outside deterioration, while water flowing through a cast iron pipe slowly eats away at the bottom of the pipe until it creates a deep channel – one that can eventually cut all the way through to the soil.

Not only does this cause irreversible damage to the pipe, it can also result in soil erosion and damage to your property’s foundation.

To address the issues of leakage or channeling in older pipes, a new CIPP (cure in place pipe) lining can be applied to the interior of the pipe and install what is essentially a new pipe – one that’s more resistant to cracks and leaks.

Tree root infiltrationTree Root Infiltration: Tree root infiltration is one of the most common pipe problems – and also one of the most damaging. Not only do the growing roots clog the pipe, they also expand cracks in the piping and can contribute to the pipe’s eventual structural failure.

Waterjetting can cut and remove the roots that have made their way into the pipe, but any damage caused to the piping itself will remain, and new roots will infiltrate the pipe again.

If removing the tree is not an option, you still have possible long-term solutions. By pairing waterjetting with a new CIPP lining, you both remove the offending roots and install a new pipe to prevent further root infiltration.

If you think your pipes might have any of these issues, contact us today to discuss your trenchless pipe repair options.

Pipe Lining Clients of Dynamic Drain Technologies