Class 5 - Class 5 Pumps, Compressors, & Expanders...

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Unformatted text preview: Class 5 Pumps, Compressors, & Expanders Pumps- Provide energy to move a liquid from one location to another- Increase elevation, pressure, or velocity of a liquid- Centrifugal (or kinetic) and displacement pumps - common H (pump head) = [(v2)/(2g)] + z + [P/(ρLg)] H in units of ft or m v is velocity of liquid in units of ft/s or m/s z is elevation in ft or m P is pressure of the liquid in appropriate units g is gravitational acceleration (32.2 ft/s2 or 9.81 m/s2) ρL is liquid density in appropriate units signifies change of conditions (discharge – suction) Centrifugal Pump Centrifugal Pumps Pros - Simple operation, low cost, low maintenance, uniform flow, quiet operation, can handle liquids with solids Cons – Cannot be operated at high head pressures, difficulty handling highly viscous fluids, narrow maximum efficiency operating conditions Head (pressure) is developed by the speed of the rotor Capacity range: 0.5 to 2 x 104 m3/hr Discharge Heads: 2 or 3 m to ~4900 m (equiv to ~48 MPa) (Typical maximum head for a single stage is 500 ft; with multiple stages, heads as high as 3200 ft can be obtained) Select Centrifugal Pump so Operating Point is Located on the Characteristic at the Point of Maximum Efficiency Efficiency Head Brake hp Effect of Viscosity Increasing viscosity for a fixed capacity, Q, decreases the pump head and the pump efficiency, and increases the brake horsepower (Viscosity effects can be substantial) Positive Displacement Pumps Pros – Higher efficiency, highly viscous fluids OK, high head pressure...
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This note was uploaded on 11/14/2011 for the course CHEN 4520 taught by Professor Wiemer during the Fall '11 term at Colorado.

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Class 5 - Class 5 Pumps, Compressors, & Expanders...

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