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Pump apparatus and methods of making and using same are disclosed. One inventive apparatus includes at least two pump stages having different performance characteristics combined in series to substantially match an intended pumping application. An inventive method includes selecting two or more pump

Pump apparatus and methods of making and using same are disclosed. One inventive apparatus includes at least two pump stages having different performance characteristics combined in series to substantially match an intended pumping application. An inventive method includes selecting two or more pump stages having different performance characteristics that when combined in series overcome limitations of at least one of the pump stages.

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What is claimed is: 1. An apparatus comprising: (a) a driver; (b) a driver shaft turned by the driver; and (c) at least two centrifugal pump stages on a pump shaft arranged in series and having different performance characteristics, the pump shaft coupled to the driver shaft by one or more items se

What is claimed is: 1. An apparatus comprising: (a) a driver; (b) a driver shaft turned by the driver; and (c) at least two centrifugal pump stages on a pump shaft arranged in series and having different performance characteristics, the pump shaft coupled to the driver shaft by one or more items selected from a coupling, a protector, a seal chamber, a thrust chamber, and combinations thereof. 2. The apparatus of claim 1 wherein the at least two centrifugal pump stages comprise a first set of centrifugal pump stages each having a first defined set of performance characteristics, and a second set of centrifugal pump stages each having a second defined set of performance characteristics. 3. The apparatus of claim 1 wherein the at least two centrifugal pump stages comprise a first set of centrifugal pump stages and a second set of centrifugal pump stages, wherein each centrifugal pump stage in the first set has first identical performance characteristics, and each centrifugal pump stage in the second set of pump stage has second identical performance characteristics. 4. The apparatus of claim 1 wherein the performance characteristics are selected from head flow characteristics, brake horsepower characteristics, operating range, thrust characteristics, efficiency, net positive suction head, and two or more thereof. 5. The apparatus of claim 1 having a stage mixing ratio ranging from about 1:99 to about 99:1. 6. The apparatus of claim 5 wherein the stage mixing ratio ranges from about 1:9 to about 9:1. 7. The apparatus of claim 6 wherein the stage mixing ratio ranges from about 3:7 to about 7:3. 8. The apparatus of claim 7 wherein the stage mixing ratio is 1:1. 9. The apparatus of claim 1 wherein the driver is a motor and the coupling is a protector separate from the motor. 10. The apparatus of claim 1 wherein the driver is a motor and the coupling is a protector integral with the motor. 11. The apparatus of claim 1 including integral instrumentation adapted to measure one or more downhole parameters. 12. The apparatus of claim 1 in the form of an electric submersible pump. 13. The apparatus of claim 1 in the form of a horizontal pumping system. 14. A method comprising: (a) selecting a first centrifugal pump stage comprising a first set of centrifugal pump stages, the first set of centrifugal pump stages each having a first pump performance characteristic; (b) selecting a second centrifugal pump stage comprising a second set of centrifugal pump stages, the second set of centrifugal pump stages each having a second pump performance characteristic; (c) attaching the first and second sets of centrifugal pump stages in series on a common pump shaft; and (d) coupling a driver to the pump shaft by one or more items selected from a coupling, a protector, a seal chamber, a thrust chamber, and combinations thereof. 15. The method of claim 14 wherein the performance characteristics are selected from head flow characteristics, brake horsepower characteristics, operating range, thrust characteristics, efficiency, net positive suction head, and two or more thereof. 16. The method of claim 14 wherein the selecting steps comprise having a stage mixing ratio ranging from about 1:99 to about 99:1. 17. A method comprising: (a) determining a pumping requirement for transferring a fluid; (b) selecting at least two centrifugal pump stages to operate in series to form a pump, the pump having a pump shaft, the at least two centrifugal pump stages of the pump having different performance characteristics; (c) coupling a driver to the pump shaft by one or more items selected from a coupling, a protector, a seal chamber, a thrust chamber, and combinations thereof; and (d) pumping the fluid using the pump to meet the pumping requirement. 18. The method of claim 17 wherein the selecting at least two centrifugal pump stages comprises selecting a first set of centrifugal pump stages each having a first defined set of performance characteristics, and selecting a second set of centrifugal pump stages each having a second defined set of performance characteristics, and wherein the second stage performance characteristics compensate for one or more deficiencies in performance of the first stage. 19. The method of claim 17 wherein the selecting at least two centrifugal pump stages comprises selecting a first set of centrifugal pump stages, each stage having a first identical set of performance characteristics, and selecting a second set of centrifugal pump stages, each stage having a second identical set of performance characteristics, and wherein the second stage performance characteristics compensate for one or more deficiencies in performance of the first stage. 20. The method of claim 17 comprising pumping the fluid using the first pump stage at a first head to the second stage, and pumping the fluid using the second pump stage at a second head. 21. The method of claim 17 wherein the first stage operates at a first efficiency, power, down thrust, and net positive suction head, and the second pump stage operates at a second efficiency, power, down thrust, and net positive suction head.