Unico Mechanical receives contract to rehabilitate Tenkiller Dam butterfly valves

Tenkiller Dam

Unico Mechanical Corp. announced that the U.S. Army Corps of Engineers, Tulsa District has awarded the company a contract to rehabilitate two 180-inch butterfly valves (BFVs) at the 34-MW Tenkiller Dam Powerhouse in Gore, Okla.

The project involves removal of the existing original equipment manufacturer metal seats and the installation of a CIRCLOC seal assembly, a Hartman Valve Company proprietary technology. CIRCLOC uses an integral elastomeric rubber seal, creating a positive and resilient seal. Unico will manufacture the new components for the CIRCLOC seal assembly, and its field service team will perform all specialized field installation work to overhaul both BFVs on site during a six-week outage in early 2022. The Unico engineering and field service team will also conduct onsite operational and performance testing for both valves upon completion of the overhaul work.

“We are proud that the Army Corps of Engineers has vetted our team and entrusted us with this large-scale and complex Butterfly Valve rehabilitation project,” said Randy Potter, president and chief executive officer of Unico Mechanical. “Our team brings decades of experience in overhauling large-scale hydropower valves, including past projects for the Army Corps of Engineers & Bureau of Reclamation, so this project is an ideal fit. It is critical to the success of the project that the engineering, manufacturing, and installation of all components be managed and performed by a single entity to ensure the project runs smoothly and is completed on time and to specifications.”

The Tenkiller Dam valve refurbishment includes new gearboxes and controls, lubrication systems and valve bypass systems. Unico Mechanical will provide all services related to the contract with its own craft people and in-house engineering support.

Unico Mechanical is a full-service provider of valve and turbine overhaul services, including engineering, failure analysis, replacement part manufacturing, component dimensional restoration, weld overlaying, shop machining, in-place field machining, performance testing and complete refurbishment.

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Elizabeth Ingram is content director for the Hydro Review website and HYDROVISION International. She has more than 17 years of experience with the hydroelectric power industry. Follow her on Twitter @ElizabethIngra4 .

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