JacksonThursday LabTroy Wilsey03/27/02Troy E. WilseyThursday LabIntroduction: This lab covers how pumps react to different loads and different rpms. The flow rates will be compared from various rpms.Procedure:Required Equipment1.Water tank and pump device with scaled bucket2.Current and Voltage Meters3.Stop WatchSteps for Experiment1.Close flow valve fully2.Raise pump rpm to 2500 rpm3.Record pressure out of pump4.Open valve to start flow, record pressure and measure time to fill bucket for flow rate (be sure rpm is constant, small variables in rpm will occur when valve is opened)5.Open valve in small increments and repeat step 3 6.Repeat steps 3 thru 5 for 3000, 3500 and 4000 rpmData: (Calculated Data Found on Excel Sheets)Calculations: Discussion: During this lab it was noticed that as the pressure on the pump decreased the flow rate of the pump increased as well at all speeds. Then as the speed of the pump increased the power required by the pump and the pressure reached increased exponentially. These results, stated above, did not exactly match what the results were supposed to be but were close enough to prove they were true. The curves created for this pump all matched closely to expected. Considering the restricted accuracy for this experiment, the pump curves followed the traditional pump curve quite well with max pressure at no flow rate, and low pressure at max flow rate. The efficiency of the pump was not very good; it ranged from 15 percent at slow speeds to 18 percent at higher speeds. This low efficiency is explained by the characteristics for centrifugal pumps to slip. There is always some flow back to the center of the impeller and this amount that does get by determines the efficiency.Issues of the Lab: This lab went very smoothly with no outstanding problems to report. The data when plotted made sense and followed expected results....
