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The Grand Coulee Dam in the United States was expanded with a pump-back system in 1973. [78] Existing dams may be repowered with reversing turbines thereby extending the length of time the plant can operate at capacity. Optionally a pump back powerhouse such as the Russell Dam (1992) may be added to a dam for increased generating capacity ...
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Depending on the size of the pump, it generally produces 5 to 40 litres (1 to 9 imp gal; 1.5 to 10.5 US gal) of liquid at each stroke. Often this is an emulsion of crude oil and water. Pump size is also determined by the depth and weight of the oil to remove, with deeper extraction requiring more power to move the increased weight of the ...
As has been noted, a typical pump failure, based on actual year 2002 reports, costs US$5,000 on average. This includes costs for material, parts, labor and overhead. Extending a pump's MTBF from 12 to 18 months would save US$1,667 per year — which might be greater than the cost to upgrade the centrifugal pump's reliability. [32] [1] [33]
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The pump-turbine units were uprated in July 1972 from their initial rating of 175 MW each to 204 MW each, increasing the plant's overall rating from 350 MW to 408 MW. [ 3 ] [ 16 ] From 1998–1999, the turbine runners for both units were upgraded, resulting in improved flow rates and another power uprate to 225 MW per unit (450 MW total).
Power - 99 hp (74 kW) at 4300 rpm; Torque - 177 lb⋅ft (240 N⋅m) at 2000 rpm; Engine type - Inline 4-cylinder SOHC; Rocker arm - Roller Follower type [14] Fuel system - Distribution type jet pump (indirect injection) Combustion chamber - Swirl type; Bore x Stroke - 91.1 mm × 95 mm (3.59 in × 3.74 in) Compression ratio - 21.0:1
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