Experiment #1: Centrifugal Pumps Alberto J.Pérez #79737

Agenda  Objective  Experimental Procedure Summary  Results Explanation  Conclusion  Recommendations

Objective  The overall objective of the present experiment is the characterization of a single pump.

Experimental Procedure Summary  Single Pump Characterization  Select maximum rotational pump speed adjusting the power controller to 100%o SWA1. Start the process of taking data when valve V5 is totally closed. Repeat the step above for a gradually increasing set of valve V5.  Single Pump Operation Characterization  The procedure to perform this characterization is similar to the last; the only difference is that you must keep a constant rotational speed by using the power controller each time you set a new flow rate. Four rotational speeds will be used 20 Hz, 30 Hz, 40 Hz, and 50 Hz.  Pump Suction Conditions  You will simulate different suction condition by closing the inlet valve V1. Set the inlet valve V1 at least three different apertures.  System Characteristics, Duty Point  The flow rate of the pump would be controlled by altering the rotational speed of the pump via the power controller SWA 1. Decrease the speed lightly by adjusting SWA 1 and “Take Sample”. Repeat step d various times until you get a well-defined curve.

Formulas

Results Table 1.3 Single Pump Data at max speed (100%) Obs. ROD Data(Sensor Reading)Armfield Software Calculation Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s Pump Total Head m Pump Power Output W Overall Efficien cy %

Table 1.4 Single Pump Data at 20 Hz Obs. Raw Data(Sensor Reading)Armfield Software Result Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s Pump Total Head m Pump Power Output W Overall Efficien cy %

Table 1.5 Single Pump Data at 30 Hz Obs. ROD Data(Sensor Reading)Armfield Software Result Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s Pump Total Head m Pump Power Output W Overall Efficien cy %

Table 1.6 Single Pump Data at 40 Hz Obs. ROD Data(Sensor Reading)Armfield Software Result Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s Pump Total Head m Pump Power Output W Overall Efficien cy %

Table 1.7 Single Pump Data at 50 Hz Obs. ROD Data(Sensor Reading)Armfield Software Result Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s Pump Total Head m Pump Power Output W Overall Efficien cy %

Table 1.17 System Pump Results (Duty Point) Obs Rod data from Table 1.9Group Calculation Results Orifice Plate Pressure Drop kPa Water Temperature Celcuis Pressure Drop Pump 1 kPa Motor 1 Speed Hz Motor 1 Power W Volumetric Flow rate m^3/s System Head m

Conclusion  In the experiment, we could observed the behavior of the centrifugal pump. After doing various tests with the pump, we understood the operational behavior and its reaction as we opened and closed the valve. While maintaining the valve open and decreasing the power of the controller, we reached a point where the pump started to lose power and in turn, started to decrease its speed. We couldn’t compare the series configurations because there was a problem with the differential pressure sensor in the second pump, but we can conclude that when pumps are working in series configuration they have a higher volumetric flow with the most Hz and the high RPM’s increases water flow.

Recommendations  Replace and verify pumps periodically to minimize pump failure in order to be able to complete the whole experiment with the two other configurations that we were unable to do. ( series & parallel)