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In this video we are going to learn how to read centrifugal pump nameplate data, as well as how to apply some important formulas to calculate the RPM, the FLOW RATE, the PUMP POWER, the HEAD PRESSURE, and the IMPELLER DIAMETER. We will also see what happens if we try to modify some of these parameters and which formulas we have to use in order to determine what will be the new performance of our pump.


Every centrifugal pump has a nameplate data like this one, which lists some of the most important data. Unfortunately, these nameplates sometimes becomes faded, damaged and illegible over time, so some very important technical data may be missing. Luckly, some formulas can be used to calculate and obtain these missing data.


Nameplates are used to designate the manufacturer, as well as to identify the product, thanks to:
PUMP SERIES, SIZE, MODEL, and SERIAL NUMBER, which is a unique sequence of numbers and letters assigned incrementally or sequentially to the pump, in order to uniquely identify it.
Nameplates are also used to designate the properties of the product such as the MAXIMUM WORKING PRESSURE value, as well as many other that we’re going to see in a moment.


As we have already learned in our previous video, the basic principle of a centrifugal pump is to transfer volumes of fluid from a region of low pressure, to a region of high pressure.


The atmospheric pressure in fact, pushes the fluid thanks to the vacuum created by the rotating element of the pump: the impeller, which allows the water, to flow from the suction side, to the discharge side.


Pump performance changes depending on the IMPELLER DIAMETER, and RPM. RPM or Revolutions per minute, is the number of revolutions or cycles completed in one minute by the impeller, which converts the mechanical energy first into kinetic energy and then into hydrodynamic energy.


The FLOW RATE instead, is the volume of fluid that can be moved by the pump in a unit of time.
Generally the flow rate can be expressed in cubic meters per hour, liters per minute or liters per second.
In the imperial measurement systems instead, the flow rate is usually expressed in gallons per minute, as we can also see here in our plate.
We can simply define the HEAD PRESSURE as the ability of a pump to elevate at a certain height a certain number of cubic meters of fluid. This value depends on the suction head of the pump, so if the RPM is increased or decreased.


The PUMP POWER instead is the power consumed by the pump in order to move and increase the pressure of a fluid. The power requirement of the pump depends on a number of factors, including its motor efficiency.

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