pumps.docx

# 3 and the results as the next table and figure b and

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(3) and the results as the next table and figure B ) and by using the previous reading we can find the head from equation (1) and the efficiency by equation (2) and the results as the next table and figure

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C ) and by using the previous reading we can find the head from equation (1) and the power consumption from the direct reading from the apparatus and the results as the next table and figure : 6 Conclusions and recommendations as we see from the previous figures we can conclude the followings : 1.Generally in pumps increasing the flow rate will decrease the provided head as shown in the plots of pump 1 and pump 2, a point of equilibrium between the both criterions needed for the systems shall be found. 2. Some experimental errors regarding the first point were found in pump 2 performance curve and in the experimental curve for pumps in series. 3. Pump 1 (N = 3000 rpm) provided a performance curve larger than that of pump 2 (N = 3500 rpm), which is only possible if pump 1 (smaller speed) has larger impeller size than pump 2 (larger speed). 4. The experimental curve of the pumps in series showed smaller maximum head (Q = 0) than the theoretical one calculated from plots of pump 1 and pump 2, so when selecting the pumps in series to be used for a system I think we should test them experimentally rather than calculating them theoretically so that we get the exact amount of head, selecting the pumps in series using theoretical analysis would result a failure in achieving the required head in an actual system. 5. The efficiency of the pumps was not calculated due to lack of givens (input power)

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