What type of Sanitary Sewer Pipe is this?

[akfishhunter]

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.

 

[fel3]

That looks like truss pipe:

http://www.conteches.com/products/pipe/polyvinyl-chloride-pvc/truss-pipe

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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

 

[bimr]

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.

http://www.conteches.com/products/pipe/polyvinyl-chloride-pvc/truss-pipe#1979305-photos

 

[akfishhunter]

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

 

[rconner]

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

 

[bimr]

The pipe does have the mearlcrete:

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

http://www.conteches.com/DesktopMod...ryid=1899&language=en-US&PortalId=0&TabId=144

 

[rconner]

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.pdf

(that I believe was known to be problematic many years ago).

 

[akfishhunter]

Thanks everyone for the help.