# Lab 4.docx - Lab 4 Centrifugal Pump Basics Caleb Shafer...

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Lab 4: Centrifugal Pump Basics Caleb Shafer MMET 401-512 Abhishek Paramasivan, MSME 2/24/2021
Memo To: Abhishek Paramasivan, MSME From : Caleb Shafer Section # : 512 Date : 2/24/2021 Re : Lab Session #4 Report _____________________________________________________________________________________ Purpose The purpose of this lab is to understand centrifugal pumps, determine head, flowrate and efficiencies, and their overall performances. Additionally, students will gain an understanding of system and pump performance curves. Procedure To achieve this purpose, a centrifugal pump will be started with all valves fully open and the pressure readings will be recorded from both the suction and discharge nozzles. Then, record the flow rate and calculate the pressure difference. Repeat the process after closing the discharge valve a bit. After the data has been recorded, do the following: 1). Plot the Pressure difference vs Flowrate (Pump performance curve). 2). Plot TDH vs Q 3). Calculate the Total Dynamic Head (TDH) Results The Results for the labs are enclosed in the attached lab handouts. Conclusions/Recommendations Centrifugal pumps power hydraulic systems by a spinning impeller, which pulls fluid in through a suction nozzle, “throws” it to the perimeter of the casing and keeps it moving in the direction of the discharge nozzle until the fluid exits. As a non-positive displacement pump, the pressure that this impeller generates is what creates flow, rather than flow creating pressure as positive displacement pumps do. It is recommended that fluid power professionals study pump performance curves when specifying a system, or create one if one is not available, to understand how changing the valve angle will affect the system’s performance. Real-world applications It is imperative to understand how changing system design affects the head, and consequently the Net Positive Suction Head, to prevent cavitation. Influential variables include but are not limited to valve angle, vapor