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Steel-Fab's Jet Flow Gates were used in the Cobble Mountain Reservoir Dam project, which received the ASDSO (Association of State Dam Safety Officials) rehabilitation project of the year award in 2007. The Springfield Water and Sewer Commission needed to rehabilitate its diversion tunnel high-head outlet works facility at Cobble Mountain Reservoir Dam. Rising 263 feet and holding over 25 billion gallons, the dam is the highest hydraulic filled earthen dam in the world, and retains the water supply for 250,000 residents in Springfield, Massachusetts, and surrounding communities. The project called for the replacement of valves which were originally installed in 1931. What made this project unique was that the valves were located more than 200 feet below ground in a confined space and under enormous reservoir pressure. The valves had to be worked on in place, in-the-dry, even though there were no isolation gates to allow dewatering prior to disassembly. Steel-Fab manufactured the 30" dia. Jet Flow Gates using a conventional pneumatic bulkhead-style pipeline plug with a custom device that inserted the plug through the rotary valve. With the plug installed, restrained, and inflated, the rotary valve could be drained and depressurized, allowing safe disassembly of the auxiliary valve components. Steel-Fab's Jet Flow Gates discharge directly into the 1500' x 12' dia. diversion tunnel.
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