Lab 4 Report
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
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
Results are listed in the tables below.
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.