Pumps power/horsepower requirement calculation

Such performance curves are normally determined by the manufacturer from operating data using water at 60°F. Note from Eq. (8-6) that the head is independent of fluid properties, although from Eq. (8-4) the power is proportional to the fluid density (as is the developed pressure). The horsepower curves in Fig. 8-2 indicate the motor horsepower required to pump water at 60° F and must be corrected for density when operating with other fluids and/or at other temperatures. Actually, it is better to use Eq. (8-4) to calculate the required motor horsepower from the values of the head, flow rate, and efficiency at the operating point. The curves on Fig. 8-2 labeled minimum NPSH refer to the cavitation characteristics of the pump, which will be discussed later. 

FIG. 29-61 Horsepower-r/min balance for a lean pump tandem-connected with a power-recovery turbine operating as the sole driver. Horsepower differences are calculated from excess head requirements as typically shown in Fig. 29-60. To convert gallons per minute to cubic meters per hour, multiply by 0.2271 to convert horsepower to kilowatts, multiply by 0.746. 

The pump used to transport the steam condensate in the power cycle from the condenser to the boiler has an efficiency of 80% (i.e., 80% of the work done by the pump is on the condensate). What size pump (kW and horsepower) is required for the estimated water flow rate What assumptions have you made in these calculations ... 

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