Centrifugal Pump Sizing Calculation: RPM - FLOW RATE - HEAD PRESSURE - POWER - IMPELLER DIAMETER
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- เผยแพร่เมื่อ 12 ก.ค. 2020
- Watch the ITALIAN VERSION HERE: • Pompa Centrifuga: Calc...
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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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Watch the ITALIAN VERSION HERE: th-cam.com/video/_sqhov49X-c/w-d-xo.html
Very useful content, many thanks
wonderful information !
Excellent
We don't need to change anything or do calculations, but it is good to know how to calculate. Thank you! 😊
Thank you so much for your comment! If you're interested you can also watch our video about Thermal power plant th-cam.com/video/Ht2wgH_EWQU/w-d-xo.html We would like to know your opinion about it. If you want to learn more about our projects, please visit our website www.jaescompany.com/
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Today I was find this circulation .and I found this video . So learnt from this video.thanks sir
Thanks for the formulas, it helped me a lot in designinging my system
Glad to hear it from youl!! Have you had a chance to watch our videos about SUBMERSIBLE PUMPS th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We would like to know your opinion about it. If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
Please let know the formula of finding the horse power of pump.
Magnificent content ☺️
thanks you
Thanks a lot dear
Useful information
Superb thanks ❤️❤️❤️
Thanks for the beautiful explanation of affinity laws. i think Power will be 50.4 HP instead of 54.3 HP in the second last case
nice video 🤗
Thank yOu so much.
Thanks to you. Pleasse watch our video about submersible pumps th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We would like to know your opinion about it.
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The relation between flow rate and the Head you have mentioned needs to be checked as far as i know head is inversely proportional to flow rate. The characteristic curve for any pump suggests that at highest flow rate there will lowest head. Please correct me if am wrong
That's correct. Maximum head is when the flow rate is zero.
Sir these formulas are helpful in calculation of new value but sir how to calculate the original at the first time ( when we dont know the original ones)
Suppose i need a air compressor to suck (1/2) kg of weight in a pipe then how i calculate the values ??
Isn't there a relation between number & dimension of the blades on the impeller and the parameters ?
I mean the larger the blades the more liquid it will pump and the more power it will require so the less the number of blades the less liquid it will pump and the more rpm are required to achieve the same efficiency
Are these formulas used to change the existing values what if need to first values?
thanks inside web team for this new video
James company could you reply the question below for Fabio Clavenna which is to me a very important question. Thanks.
Affinity's Law
How to calculate shut-off pressure in centrifugal pump?
What is maximum suction lift height?
In which type of Suction NPSH is important?
can plz show submursible pumps
Very knowledgeable thanksgiving
Happy about it!! 😀😀 If you're interested you can also watch our videos about SUBMERSIBLE PUMPS th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We would like to know your opinion about it. If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
This is already a confusing topic for people, so please correct the impeller direction at time 2:05. Others than that this video was well done. Thank you for posting.
Good Catch. I also saw that, but maybe only for animations purposes...
Hi
Can understand the formulas and substitute
But how do you get the modified gpm instead of orginal gpm?
Can you explain that
I'm also wondering about the same thing, how did he calculate the modified gpm and used it in formulas
2:04 Whoa! Time machine. Back to the future.
How do you convert ftH2O to kpa?
How did you calculate modified gpm???!
That's good for us to learning
Glad to be of help! If you're interested we made a video about SUBMERSIBLE PUMPS th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We would like to know your opinion about it. If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
How to find out CFM calculation. With example
Please sir do I need to change any thing in centrifugal pump to use it as turbine generator
Hello. Nice question! Running a centrifugal pump in reverse rotation mode will, in certain conditions, create a turbine effect. This coud be an efficient method of generating energy as well as recovering energy and contributing to energy savings. If you're interested in this topic we recommend you to watch our video about SUBMERSIBLE PUMPS th-cam.com/video/5bXNd_XUTp0/w-d-xo.html If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
why do we square the values in some of the equations?
Hello. Thank you so much for your question! To find New Head Pressure when we want to chance the RPM, in this case we have to square both original and modified RPMs. RPM is related to shaft speed and if we look at the second affinity law: "Head is proportional to the square of the shaft speed". We hope will be of help. Have you had a chance to watch our videos about SUBMERSIBLE PUMPS? th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We talk about CAVITATION and we would like to know your opinion about it. If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
Hi... Can you help me choose a pump for a project..... I need inlet diameter, rpm and pleasure that will give me 100bar at 8 smaller outlet
Sure! Where are you from sir? Have you had a chance to watch our video about SUBMERSIBLE PUMP? th-cam.com/video/5bXNd_XUTp0/w-d-xo.html We would like to know your opinion about it. If you want to learn more about our projects, you can subscribe to our channel th-cam.com/channels/b7TkWFn3nyb6XhudxGu5tw.html and visit our website www.jaescompany.com/
But I need a computer program for accounts because I am a student at the university, Please
Dear sir, I need your help that, we run a centrifugal pump which is 22 kW motor head is 40 Meters, discharge is 140 cubic metres per hour and discharge pipe Dia is 6" of 385 metres long and 165 metres of 2"branch pipes.But the thing is we need 7020 ltrs per minute, actually it is 2330 ltrs per minute.so please help me regarding this matter to improve the quantity of water and suggest and send design calculation formulas, which is helpful for me in future.
Thanks and with warm regards by
SURESH R
Maintenance manager
Aradhya Steel Pvt Ltd
India.
Waiting on this too...
You may right becoz the it is matter of Facts. But, by 1st thought the relation of Flow and Head seems wrong. If we increase the head the flow will be lessen, it means as head is inversely proportional to flow. In this thought your explanation needs more to elaborate.
You are saying affinity law .
This every one knows.
Dear Varun thank you for your opinion
Hindi speaking please sir
Excellent