Case Study - Manhole
Client
National Park Service
Project
Manhole/Vault Rehabilitation - Yellowstone National Park
Location
Yellowstone National Park, Wyoming
Description
This project completed in 2002 included 17 manholes located within the Yellowstone National Park. The manholes had significant
deterioration from wastewater chemical corrosion. The structure pictured below was a rectangular vault.
Solution
Custom fabricated liner was manufactured by Poly-Triplex Technologies, Inc. to fit the size and shape of the box structure. Liner
was saturated at the jobsite with a 2-part 100% solids epoxy resin, then positioned into the structure. Liner was then cured-in-place
with air pressure and steam heat forming a monolithic liner from the ring and cover to the benches.
Benefit
The monolithic liner has formed to the rectangular shape of the structure and provides a gas impermeable barrier to further
deterioration, infiltration and exfiltration, providing permanent protection to the pristine environment in this beautiful
National Park.
Upper Left - Yellowstone National Park Entrance
Upper Right - Yellowstone National Park Geyser
Lower Left - Liner is being saturated at the jobsite with 2-part epoxy resin.
Lower Right - Poly-Triplex Liner installation is complete and structure is back in service.
Comments
This deteriorated vault was completely rehabilitated in one day with the Poly-Triplex Liner System. The entire project was completed in a timely manner. Since this installation, the National Park Service has become to rely on the Poly-Triplex System to correct problems in many other structures including manholes, pump stations and wet wells located throughout the National Park System.
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