×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Removal / Rehab of Failed Poly-Liners (HDPE)

Removal / Rehab of Failed Poly-Liners (HDPE)

Removal / Rehab of Failed Poly-Liners (HDPE)

(OP)
   The work is in SW Florida.  Several failing 22" & 18" clay and concrete sanitary sewer pipes were rehabbed with HDPE.  However, the annular space was not grouted.  In several spots the pipes have collapsed or the joints have come apart.  The infiltration of sand is causing potholes in the roadways.
   The client would like to CIPP the pipes.  If you have any experience on removing poly-liners from collapsed pipe or have been able to rehab a similar system, I would appreciate your comments.

Thanks - Mike

RE: Removal / Rehab of Failed Poly-Liners (HDPE)

FL21USF:

I have had the opportunity to work on sever rehab projects, unfortunately, they involved complete main replacement.  It seems that the sales hype for these sytems ignored groundwater infiltration pressures, which, like in your case, caused the collapse of the liner system.  One project was a system to line a DIP river crossing, where the head pressure from the river was 8 feet, which would not seem like a lot.  The water traveled in the space between the HDPE and the dip main and leaked where the pipe entered the manhole.   We tried pulling it out, excavating into the pipe several feet, but to no avail.  I paralled the pipe with another 12 DIP main, which worked quite well, but the whole thing was rather expensive.

Sorry I dont have anything positive to say, I am lucky it was not my design in the first place to line the main.  I just wanted to let you know there are people who replace the mains since if that becomes an option, you wont feel alone in making the recommendation.

Good luck with your problem.

BobPE

RE: Removal / Rehab of Failed Poly-Liners (HDPE)

Contact me for info on Rehabing these pipes. I work in the industry but can't solicit business here. Contact info in profile.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources