EXAMPLE 14–2 Selection of Pump Impeller Size A washing operation at a power plant requires 370 gallons per minute (gpm) of water. The required net head is about 24 ft at this flow rate. A newly hired engineer looks through some catalogs and decides to purchase the 8.25-in impeller option of the Taco Model 4013 FI Series centrifugal pump of Fig. 14-15. If the pump operates at 1160 rpm, as specified in the per- formance plot, she reasons, its performance curve intersects 370 gpm at H = 24 ft. The chief engineer, who is very concerned about efficiency, glances at the performance curves and notes that the efficiency of this pump at this operating point is only 70 percent. He sees that the 12.75-in impel- ler option achieves a higher efficiency (about 76.5 percent) at the same flow rate. He notes that a throttle valve can be installed downstream of the pump to increase the required net head so that the pump operates at this higher efficiency. He asks the junior engineer to justify her choice of impeller diameter. Namely, he asks her to calculate which impeller option (8.25-in or 12.75-in) would need the least amount of electricity to operate (Fig. 14-16). Perform the comparison and discuss.
EXAMPLE 14–2 Selection of Pump Impeller Size A washing operation at a power plant requires 370 gallons per minute (gpm) of water. The required net head is about 24 ft at this flow rate. A newly hired engineer looks through some catalogs and decides to purchase the 8.25-in impeller option of the Taco Model 4013 FI Series centrifugal pump of Fig. 14-15. If the pump operates at 1160 rpm, as specified in the per- formance plot, she reasons, its performance curve intersects 370 gpm at H = 24 ft. The chief engineer, who is very concerned about efficiency, glances at the performance curves and notes that the efficiency of this pump at this operating point is only 70 percent. He sees that the 12.75-in impel- ler option achieves a higher efficiency (about 76.5 percent) at the same flow rate. He notes that a throttle valve can be installed downstream of the pump to increase the required net head so that the pump operates at this higher efficiency. He asks the junior engineer to justify her choice of impeller diameter. Namely, he asks her to calculate which impeller option (8.25-in or 12.75-in) would need the least amount of electricity to operate (Fig. 14-16). Perform the comparison and discuss.
Chapter2: Loads On Structures
Section: Chapter Questions
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Transcribed Image Text:EXAMPLE 14–2
Selection of Pump Impeller Size
A washing operation at a power plant requires 370 gallons per minute (gpm)
of water. The required net head is about 24 ft at this flow rate. A newly
hired engineer looks through some catalogs and decides to purchase the
8.25-in impeller option of the Taco Model 4013 FI Series centrifugal pump
of Fig. 14-15. If the pump operates at 1160 rpm, as specified in the per-
formance plot, she reasons, its performance curve intersects 370 gpm at
H = 24 ft. The chief engineer, who is very concerned about efficiency,
glances at the performance curves and notes that the efficiency of this pump
at this operating point is only 70 percent. He sees that the 12.75-in impel-
ler option achieves a higher efficiency (about 76.5 percent) at the same
flow rate. He notes that a throttle valve can be installed downstream of
the pump to increase the required net head so that the pump operates at
this higher efficiency. He asks the junior engineer to justify her choice of
impeller diameter. Namely, he asks her to calculate which impeller option
(8.25-in or 12.75-in) would need the least amount of electricity to operate
(Fig. 14-16). Perform the comparison and discuss.
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