# Lab 4 Report.pdf - To:u200b Sudeep Mandipalli From:u200b...

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To: Sudeep Mandipalli From: Parker Evans Section: 507 Date: 2/26/2019 Re: Lab 4 Report Purpose: The purpose of this lab is to gain a basic understanding of a centrifugal pump and determine head/flow rate relationships. It will evaluate the performance of a pump by measuring performance curves. Procedure: Labview was opened and a pump trainer was loaded prior to the lab. During the measuring portion, suction pressure and discharge pressure were taken at different levels of flow rate. The first measurement was taken while the valve was completely closed (0 GPM). The values were recorded. This procedure was followed for six different levels of the valve being open (15°, 30°, 45°, etc). All values of flow rate, suction pressure, and discharge pressure were recorded. Following the recording, ΔP (change in pressure) was calculated by subtracting suction pressure from discharge pressure. The values were then used to calculate the total dynamic head. Results: Results are listed in the tables below. Conclusions/Recommendations: When observing flow rate versus the pressure difference, you can see that the relationship has a negative exponential relationship (with pressure starting above zero). As flow rate increases, pressure decreases exponentially. Real World Applications: Pump performance curves are largely used in order to predict the variation of the differential head across the pump as the flow rates change. This is extremely useful in selecting the type of pump that would be required for jobs to ensure they can perform at the highest efficiency.
Flow, Pressure, and Total Dynamic Head Measurements and Calculations GPM (Q) Suction Pressure (P S ) (in psi) Discharge Pressure (P D ) (in psi) ΔP = P D - P S (in psi) TDH (h) (in ft) 0 1 4.5 3.5 8.085 4.4 0.99 4.45 3.46 7.9926 8.14 0.98 4.3 3.32 7.69692 15.1 0.97 3.9 2.93 6.7683 18.1 0.97 3.7 2.73 6.3063 18.6 0.97 3.6 2.63 6.0753 Post Lab Questions 1. In terms of flow rate vs head, the main difference between centrifugal pumps and positive displacement pumps is that the GPM will remain unchanged for a positive displacement pump no matter what the pressure or head changes. However, in centrifugal pumps, the flow rate changes with a change in head. 2.
3. Vapor Pressure at room temperature (21 ): a. Ethanol: 0.897407 psi b. Methanol: 1.98628 psi c. Water: 0.359417 psi 4. a. Model: AMT 426095 Heavy Duty Cast Iron Straight Centrifugal Pump b. Source: ugal-pumps-d-7-5-230-460-3-ph-430-3-x-3/?gclid=Cj0KCQiA5NPjBRDDARIsAM 9X1GKAMCbK6mYynrtFx_hjbh0Nl_ny1H6s0eD72bypy1YT3UAfFYWCeCEaAiW WEALw_wcB