Contact US

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!

*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

What type of Sanitary Sewer Pipe is this?

What type of Sanitary Sewer Pipe is this?

What type of Sanitary Sewer Pipe is this?

This pipe is currently in operation in a sanitary sewer system in southeast Alaska. It has an inside diameter of 7 3/4-inches. It appears to be plastic during visual inspection inside the manhole but some of the interior pipe footage shows failures that have fibers protruding into the pipe through crack. Appreciate any and all help.

RE: What type of Sanitary Sewer Pipe is this?

It's a thermoplastic composite, double-wall PVC pipe with concentric inner and outer walls braced by a truss-type structure. A number of firms make this pipe. It is a lightweight piping material for the budget conscious.

Truss pipe is one manufacturer, but don't know the particulars on this specific pipe. If you excavate to the pipe, it should be labeled.


RE: What type of Sanitary Sewer Pipe is this?

Thanks, That looks close except it is missing the mearlcrete betweeen the trusses.

RE: What type of Sanitary Sewer Pipe is this?

Agree. At least pipe penetrating is likely ABS truss pipe, that plastic with cement to fill/stiffen along with the web in the interstice.

RE: What type of Sanitary Sewer Pipe is this?

The pipe does have the mearlcrete:

"The truss voids are filled with lightweight Mearlcrete for additional stiffness and compressive strength."


RE: What type of Sanitary Sewer Pipe is this?

While don't know for sure if the newer white pvc stuff would do any better, would suggest you check your image and video/failures of existing line with what is shown at http://www.ncpi.org/assets/DiscoveringWhyPipesFail... (that I believe was known to be problematic many years ago).

RE: What type of Sanitary Sewer Pipe is this?

Thanks everyone for the help.

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close