Tracking – Does It Damage Your CIPP Project?

“We installed a CIPP liner awhile back on a vertical plumbing stack about 2 months ago. We got a call that a damaged pipe in the lower lever mechanical room was leaking sewage into the room. This was in a 3 story apartment building and this stack had a cracked pipe in the mechanical room so we lined the pipe from the roof down the stack and out toward the street. We had 12 reinstatements that we made with our tie-in reinstatement equipment cutting out the liner that covered the tie-ins. A video inspection revealed the crack in the lower lever completely covered with no breaks in the CIPP liner but we did notice some discoloration at each one of the tie-ins. Doesn’t the liner seal tight to the host pipe? How is the wastewater getting down the stack and coming out of the crack in the mechanical room?”

A myth promoted by sales staff who don’t fully understand how liners work think that the resin glues itself into a bond with the host pipe you lined. It doesn’t. CIPP liner is considered a “close fit” material that often mechanically locks to the pipe due to resin flowing into cracks and crevices that hold the liner in place and many confuse mechanical locking with bonding.

Drain, Waste and Vent
Drain, Waste and Vent Piping

With that information let’s analyze what is happening here. Gravity combined with the reinstatements you made when you cut out the liner covering each tie in allows wastewater to migrate between the host pipe and the liner. It may have taken the last two months to begin to exit at the lower level from each one of the tie-ins. This very issue is what prompted the IAPMO folks to advance a ban on CIPP lining for cast iron pipe. Unsealed tie-ins have been surfacing around the country and the organization, in an effort to address, has taken the road toward abandonment of the CIPP process.

Now that we know what is causing the problem, your next challenge is how to fix it. Thankfully there is a remedy. Our Quik-Coating System has been employed to fix these types of problems for many contractors. Be removing the CIPP liner coating at each tie-in area in the lined pipe, we can insert the AIPPR coating method equipment into the lined pipe. We can build a seal at the tie-in opening and a few feet back up the line or coat the whole tie-in back to the appliance attached to it. The poly urea material we are using expands slightly sealing the gap between the CIPP liner and the host pipe. The other option is to tear out walls, ceilings and floors and replace the pipe you just lined with the CIPP liner. This option may be more costly than the coating process I described.

We developed the AIPPR for jobs you described substituting this process for the CIPP process that leaves these tie-ins subject to this type of leaking. The Quik-Coating AIPPR process using poly urea insures you won’t have those post rehabilitation leak issues.

If you would like more information, call us at 888-364-6464 or write to info@pipeliningsupply.com.

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