Quantcast Figure 13   Single-Acting and Double-Acting Pumps

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Pumps DOE-HDBK-1018/1-93 POSITIVE DISPLACEMENT PUMPS Power pumps typically have high efficiency and are capable of developing very high pressures. Figure 13   Single-Acting and Double-Acting Pumps They can be driven by either electric motors or turbines.   They are relatively expensive pumps and can rarely be justified on the basis of efficiency over centrifugal pumps.  However, they are frequently justified over steam reciprocating pumps where continuous duty service is needed due to the high steam requirements of direct-acting steam pumps. In general, the effective flow rate of reciprocating pumps decreases as the viscosity of the fluid being  pumped  increases  because  the  speed  of  the  pump  must  be  reduced.    In  contrast  to centrifugal pumps, the differential pressure generated by reciprocating pumps is independent of fluid density.   It is dependent entirely on the amount of force exerted on the piston.   For more information on viscosity, density, and positive displacement pump theory, refer to the handbook on Thermodynamics, Heat Transfer, and Fluid Flow. Rev. 0 ME-03 Page 21


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