1721

(210.2)

(51.0)

(128.3)

4.13%

2.33%

2.93%

error"

error"

error"

"Error in predicting best efficiency point.

FIGURE 13A through C Diameter reduction of radial-flow impeller (gpm X 0.06309 = l/s). D is measured in inches (centimeters).

the predicted values. Except for the use of the mean diameters, the procedure was essentially the same as that described for Figure 13, and all points and curves are similarly labeled. The corrections given in Figure 14 would have made very little difference in the computed diameter reductions, and those of Figure 15 were not applicable to impellers having specific speeds greater than ns = 2000 (0.73). In this case, the product nsDm did not remain constant and the maximum efficiency increased as Dm was reduced. Although the

SPECIFIC :

FIGURE 15 Corrections for calculated impeller diameter reductions (Reference 13). (H, = n/2733)

TABLE 5 Impeller diameter corrections

D before cutting

in

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Survival Treasure

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