# BLDG 371 lab 3.docx - Objective The objective of this lab...

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Objective: The objective of this lab is to find the pump characteristic curve for single pump operation and two pump (series and parallel) operation. Introduction: Pumps are a very useful pieces of equipment that allow us to move liquids or gases from one point to another. For example a pump allows us to move oil from the oil fields to the refineries through pipes. When applying pumps to buildings it allow us to move water from one point in the building to another point. When water is traveling in the pipes of a building, it encounters friction, the pump adds energy to the water to allow it to overcome the losses due to friction. Pumps also allow for the fluid to be transferred from the lower floors to the higher floors, and they can also increase the velocity and pressure of the water. There are different kinds of pumps which have their own characteristics. Some pumps are fixed speed while some are variable speed. In this experiment we will be conduction tests to determine the different pump characteristic curves of the pumps used. We will be testing single pump operation, and two pump operation in series and parallel, where one pump is fixed speed and the other is variable speed. In an ideal series operation when a second pump is added the pressure head in the system increases without increasing the flowrate, as for parallel, when a second pump is added the flowrate increase. For single pump operation we will be running the pump at different speeds (3300 rpm, 2900 rpm, 2300 rpm, and 1700 rpm), and for each speed we will be slowly closing a throttle valve to reduce the flowrate. For each flowrate the pressure at pump inlet (P1), pressure at pump outlet (P2), hydraulic power (P hyd ), electric power (P el ), and efficiency (η) will be recorded. For two pump in series operation we will be running the pumps