Faraday Tunnel Gate Inspection
The sluice gate at Faraday Dam in Oregon operates fully submerged with approximately 40′ of head at the middle of the gate. The estimated operation pressure on each of the bushings is around 4,000psi (4ksi). The gate is used for water level control, therefore continuously makes small adjustments to its elevation.
The gate was removed in September 2014 to perform inspection of gate wheel assembly and bearings. It was determined that several of the wheels had either stopped working or fallen off due to corrosion and lack of lubrication. The remaining bearings were found to have excessive clearance due to wear. New stainless steel sleeves were fabricated by Portland Manufacturing and welded onto the gate wheel stub shafts. New composite greaseless bushings supplied by CIP were installed to replace the failed bearings.
Tunnel gate was removed to inspect condition of CIP Composite Bushings. Wheels were removed to inspect and document condition of new stainless steel sleeves and CIP bushings. Sleeves and bushings were found to be in excellent condition and did not warrant further disassembly. Wheels were checked to make sure they were not bound up on the stainless steel sleeves and continue to rotate. All components look great after one year of service.
Report by Rob Adams
Portland General Electric