Pinnacle Projects

The Pinnacle Projects Series, launched in 2025, highlights some of our most significant accomplishments.

Pinnacle Projects Series: Flow-Liner at the Pentagon

The Pentagon, located in Arlington County, Virginia, serves as the headquarters of the United States Department of Defense. Designed by architect George Bergstrom and constructed by general contractor John McShain, construction began on September 11, 1941. This iconic five-sided structure encompasses approximately 6.5 million square feet and accommodates around 28,000 military and civilian personnel, along with 3,000 support staff. With five floors above ground, two basement levels, and five concentric ring corridors per floor totaling 17.5 miles, the Pentagon is not only a vital operational center but also a designated National Historic Landmark since 1992.

In this critical facility, even minor infrastructure failures can pose major challenges. Pentagon personnel reached out to a Certified Flow-Liner® Installer to address a persistent leak in a cast-iron roof drain. The 3-inch vertical drain pipe, located above occupied office space, featured three 90° bends within the first 7 feet—making traditional replacement costly, invasive, and disruptive. Using Flow-Liner®’s Cured-In-Place Pipe (CIPP) lining technology, the installer was able to rehabilitate the line without excavation, demolition, or interruption to building operations. Our advanced liner system, combined with a specialized installation method, allowed precise navigation through multiple tight bends. The entire repair was completed in just one day—restoring functionality while preserving the integrity and daily operations of one of the most secure and active buildings in the world.

"We are very pleased with how the Flow-Liner installation was performed by your Installer. The pipe lining saved us from having to dig up and replace the piping... Greatly appreciate the flexibility of the crew to work around our schedules and to get the job completed in such a tight window of opportunity."
- Pentagon Representative

Using our CIP-Conduit® Lining System, a Flow-Liner® Certified Installer quickly and effectively sealed the conduit—no excavation, no disruption, and no downtime. The conduit was successfully lined in place, saving time, money, and resources. The Project Manager from Granite-Traylor-Frontier (GTF) Joint Venture shared:
“The finished product exceeded our expectations and helped GTF close out an item of punchlist work that could have been more costly if not for the technology provided by your company. We would definitely utilize your services in the future if required and highly recommend your firm to any other Contractors who experience a similar problem.”

Flow-Liner CIP Conduit Safeguards White House Communications

Flow-Liner® CIP Conduit® technology was chosen for a critical telecommunications project in The West Wing of the White House. Recommended by one of the largest U.S. government contractors, a Certified Flow-Liner Installer brought their expertise to address a deteriorating 4-inch telecommunication conduit that was allowing underground water infiltration—posing a risk to new telecom cables scheduled for installation.

The project required stringent protocols due to its high-security location. The Secret Service conducted thorough background checks on the Installer's company and crew, while equipment underwent detailed inspection upon arrival. White House regulations prohibited logo displays, and only a Secret Service-issued digital camera was permitted to document the work.

Challenges and High Stakes

The location and condition of the conduit presented unique challenges. Situated in the basement and beneath the steel-reinforced floors of the first floor—home to the Oval Office and other executive offices—traditional excavation and replacement were not viable options. Hurricane Sandy further complicated scheduling, yet the Flow-Liner team remained committed.

Efficient, Non-Invasive Solution

Before installation, the crew performed a video inspection of the 45-50 foot conduit, which included several bends. Despite these complexities, the Flow-Liner CIP Conduit was successfully installed in less than a day, preserving the historical integrity of the West Wing. This advanced cured-in-place pipe (CIPP) technology allowed the utility contractor to avoid disruptive demolition, saving significant time and labor while eliminating noise, dust, and debris that could have affected the President and staff. The liner’s seamless interior prevents water infiltration, ensuring long-term protection for critical telecommunications.

A Legacy of Excellence

Reflecting on the project, the Installer remarked: “This project will be remembered as the pinnacle of our company’s history. We’re proud that Flow-Liner technology is helping to protect some of the world’s most vital communications.” Flow-Liner CIP Conduit has proven to be an industry leader, offering versatile, non-invasive solutions for electrical and telecom conduit rehabilitation in even the most sensitive environments. Whether for military bases, government facilities, or iconic landmarks, Flow-Liner ensures reliable performance with minimal disruption.

Flow-Liner at the Oklahoma State Capitol

Located on more than 100 acres in northeast Oklahoma City, the Oklahoma State Capitol is the only capitol in the world surrounded by working oil wells. The architecture is Greco-Roman and the structure comprises 650 rooms and 11 acres of floor space with murals, restored stained glass, tribal flag plaza and changing art exhibits. The current site was chosen in 1915 and construction was completed in 1917. Construction of a dome was completed in 2002, a feature that was included with the original design plans of the building but never completed. A complete multi-year restoration of the historic Capitol concluded in 2022. Following the restoration, the Oklahoma Arts Council reinstalled hundreds of artworks and installed 21 newly commissioned artworks throughout the building to create a new visitor experience. During heavy rains, maintenance discovered roof drains were leaking and contacted a certified Flow-Liner Installer to avoid costly demolition. Learn More

The Oklahoma State Capitol faced leaks from several 8-inch, vertical cast iron roof drains, which included some condensate branch lines. Replacement was not feasible due to the disruption it would cause to occupied office spaces. Using Flow-Liner® technology, a certified installer successfully lined the drains and reinstated the branch lines without excavation or disruption, providing an effective and non-invasive solution.
A Glowing Review
"The pipe lining crew was professional and courteous. They worked LOTS of overtime to get out of here as soon as possible… They made positive location identification before they drilled with the robotic tool, we definitely appreciated their carefulness!!! They took the time they needed to make sure it was done right. The pipe lining saved us from having to break open chases in the occupied office spaces where the branch lines were. This would have been very costly and inconvenient. We could highly recommend your product and consider it a very viable option compared to pipe replacement. I was really impressed with the strength of your product."
-Capitol Maintenance Administrator