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Question: a new contract is being negotiated for the maintenance of...

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A new contract is being negotiated for the maintenance of Hoover Dam. Part of this contract involves the replacement of the turbine bearings on each of its electric generators. An analysis is performed on the 50 year old bearings to determine the power loss in each bearing and the pump size required for supplying oil to each bearing The depth of the turbine inlets is 222 m and the total flow is 1000 mls. The transverse load on each bearing is 22 tons. There are 16 turbines, 8 on each side of the dam. Each turbine rotates at 180 RPM. The shaft diameter of each turbine is 38 in. Each HDL bearing is designed for maximum efficiency. The l/D ratio for each bearing is 1/4 The journal and bearing surface roughness are each 3.5 μ m. Give the following (5%) Sommerfeld number S (dimensionless): (5%) Shaft eccentricity e (in): (5%) Radial clearance c (in) (5%) Lubricant viscosity (lb-s/in2) (5%) Lubricant (SAE # & temperature) (5%) Friction coefficient f (dimensionless): (5%) Friction power loss at each bearing (hp): (5%) Power to each turbine (hp) (5%) Side flow of lubricant (in%) (5%) Maximum pressure in fluid film (lb/in.) Bearing parameters D = 38 in L 9.5 in W 22 tons 44,000 lb P W44,000 180 RPM-3 rev/sec CO L.
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