Case Study: Dam Spillway Gate Seals The Client’s Issue Dam spillway gates needed to be rebuilt for a power station on an 88 square mile reservoir which was originally built in 1968. Spillway gate hinges generally require seals to keep out airborne water, mud, silt, and debris to prevent corrosion, grinding, or even seizing up. At the same time, seals keep grease inside to ensure the interior dynamic surfaces run smoothly against each other. These seals are required to function reliably in rugged conditions for as long as 50 years — without maintenance. Reservoir water levels rise and fall according to the balance of rain input and power generation take-off. Consequently spillway gates need to be raised and lowered at any time of day or night, to keep the water level right without overflowi

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