New Transition Liner Material

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This is an update to a previous post and republished to let you know that we’ve added a transition liner that addresses 3″ to 4″ transitions. 

You found roots in the line, discussed options with your customer who elected to line the pipe, and now you have to line it.  You noted a transition 35′ (10.7m) into the line from 4″ (100mm) to 6″ (150mm) and now have to decide how you want to tackle the transition.  You noted that the 35′ (10.7m) into the line happens to fall right at the area near the street curb where it transitions to 6″ (150mm).

Transition in pipe size

Transition in pipe size

You could open the pipe at the building and use a liner that transitions the size issue so you lined both sizes at one time or you could open a pit at the transition and shoot one size toward the main and the other size toward the house, installing a clean-out at the curb to close it up.  Regulatory issues may dictate which method you use.  Some agencies require different materials for use in the “agency” owned section of the pipe vs. the “building” owner section of the pipe.  Other issues may address collapsed pipe and what if any point repairs need attention before lining.  In a collapse between the building and the right of way, pipe bursting may be an option vs. lining.


If the pipe is not collapsed nor needed to be opened at the right of way, then lining the pipe from the building may be the best option to choose.  How do we do it without opening the pipe at the transition?  There are two options here.  Option one is to choose a stretchy material that contracts and expands to fit the differing pipe sizes.  The material should be thick enough to carry the live and dead loads as it expands in the larger diameter, yet does not contract to the point that the smaller diameter flow is impeded.  Pipe Lining Supply carries three materials that fit this profile.  The latest offering is Ultra Flex that offers minimal elongation stretch while expanding to follow the shape of the liner.  Super Flex liner, a material that is made in two thicknesses can expand approximately 25% of its size.  5″ (125mm) material is installed that shrinks to 4″ (100mm) and expands to 6″ (150mm).  Finally is Wovo liner, a very flexible material that stretches over 30% in all directions.  For guidance on which to use, contact your Pipe Lining Supply support staff to help you decide.

For many of you, hitting a mark or ending point before the main is the most important part of your lining job.  For those applications, the Pipe Lining Supply transition liner takes 4″ (100mm) liner with scrim material and couples it to 6″ (150mm) liner with scrim that includes a 3′ (.9m) transition.  In the case of a pipe that transitions from 3″ to 4″, we now supply 3″ coupled to a 4″ by a 3′ transition piece. The most important part of deploying the transition liner is to make sure your larger material deploys inside the bigger pipe and not before it arrives there.  Measurement of the location of the transition and where it begins is critical.  These type of liners can be pulled into place as well as inverted.  Some inversion equipment may have a harder time processing some of the different liners.  Be sure that your inversion equipment, if using that method, will process the transition materials you’ve selected to use in your line. We also have begun supplying a 3″ x 4″ transition liner in various lengths of each.

Transition Liner



If you need to perform a lining project that requires you open a pit at the transition, you may install a clean-out at the transitPit with Clean-oution.  Pictured is a typical pit with the clean-out installed and ready to be backfilled.  You may choose a different clean-out than pictured. The example displayed shows a double clean-out.  One side handles the direction toward the main, while the other can address the pipe back toward the building.  Local code may prescribe which method or type of clean-out you must install.

Which liner you choose is up to you. Any of the options listed above will perform the transition you are looking for. Pipe alignment, turns, offset joints, etc. may direct you to chose one over the other.




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