Case Study - Vaults
Client
City of Everett, WA
Project
2nd Generation Rehab - Severely Deteriorated 89" Diameter Concrete Pipe
Location
89" Diameter Pipeline in Everitt, WA
Description
This pipeline had previously been rehabilitated with an epoxy coating. Pinholes in the coating system had
allowed sewer gases to continue to attack the host structure, resulting in failure of the coating and further
deterioration of the pipe. Pipe has benches or shelves in the bottom forming a channel for the sewage flow.
Solution
Poly-Triplex Certified Installer bridged the flow in the channel with a sub-floor and allowed the sewage to flow underneath,
saving the city many thousands of dollars. The liner was then pulled through, inflated with an internal bladder and
cured-in-place from waterline to waterline.
Benefit
The Poly-Triplex Liner System incorporates a gas and water impermeable inner membrane that is encapsulated between
layers of structural fiberglass. These liner materials are saturated with epoxy and laminated to the interior of the pipe
providing a permanent barrier to further deterioration.
Photos
Upper Left: Epoxy has failed due to pinholes in the coating allowing gas penetration to further attack the host structure.
Upper Right: Structure has been thoroughly pressure cleaned and remains of epoxy coating removed. Structure is now prepared
for the Poly-Triplex installation.
Upper Left: Poly-Triplex Liner has been cured-in-place using the removable inflation bladder.
Upper Right: Inflation bladder is removed to reveal a completely monolithic and permanent rehabilitation.
Comments
This pipe was rehabilitated in 1998 and is still working as effectively as it was the day it was installed.
There has been no further deterioration.
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