Fluid Mechanics: Centrifugal Pump Characteristics (21 of 34)

Note: At 44:52, the equation should be Q = V*A, not Q = V/A.

0:00:15 - Introduction to centrifugal pumps, measuring pump head
0:04:09 - Pump performance curves
0:16:18 - Net positive suction head (NPSH)
0:21:46 - Example: NPSH
0:25:30 - Pump selection using pump specific speed (Ns)
0:33:50 - Example: Centrifugal pump in a pipe network
0:56:15 - Comments on homework

This lecture series was recorded live at Cal Poly Pomona during Spring 2018. The textbook is White "Fluid Mechanics (8th edition)."

[celospiky]

I have been working for more than 10 years as rotating engineer in water treatment plant and offshore oil n gas industry where the pump require either ANSI or API 610 type. But for me, this uncle has produced one of the best explanation in youtube and easy to be understood by our normal people in the world

[mikeearls]

I am utterly amazed watching these videos...i am a 50 year old guy who was never good in math and science but have an overabundance of curiosity about how things work. I feel lucky to live in a time where i can look anything up on youtube and get some undestanding about how the physical world works around me. Also, i had no idea how involved pumps were...meaning the engineering behind the pump.

[jerrysmith]

Feel like this prof is more like a coach, you don't wanna let him down. I bet students work their tail off for him because he's engaged in the learning process.

[cum_as_you_are]

What a great teacher. Wish i could've attended to his lectures. Most of this stuff i had to figure out on my own and with the books

[eeoui]

Excellent lecture, Dr. Biddle. My professor doesn't even try to explain and solve these problems. Thank you very much.

[alouisiusprabowo]

Am over 2 years in pump industry as engineer. Splendid, crystal clear sir. Thank you.

[myokokoaung]

It is crazy how I can watch those lessons for free. Thank you very much.

[denwilden]

Great lecture, remembering when I was in university. Now I work in small business servicing pump, and this lecture is realy helpfull. Thanks Prof

[TenkiKun]

I left my class for this topic, but luckily i found this video, it's about 2 days bfr exam, , i watched it, , excellent lecture, , hope my final exam become good

[wonkisbonita]

If you try and do the math on minute 44:48, on the replacement of V, Q=AV, so you should have V=Q/A. Thus, V=4Q/(pi*D^2). V=4Q/pi with D=1.

[ericzenteno]

This professor is a legend, I wish I had him as teacher at University 😮

[falq]

Thanks for your effort. One tip though, unlike the case in the pump sketch you showed, for centrifugal pumps and compressors, the suction side is always one standard size larger than the discharge size. This is to minimize losses and, consequently, reduce cavitation possibilities.

[kartikeyasharma]

just loved the lecture, gorgeous explanation, for anyone wondering how is H vs Q is plotted it is drawn by EULERS MOMENTUM EQUATION
Your welcome

[ebrahimamiritokaldany]

The equation provided to calculate delta z based on NPSH is for the case that the water level at the supply reservoir is below the water level at the demand reservoir. So, for the case which is shown in the video, the water level at the downstream reservoir should be lower than that the water level at point 1 and for this case: delta z (minimum water level difference between two reservoirs)= (Pa-Pv)/gamma - NPSH (for available pump) -HL (all head losses) as shown in the video. It is not surprising that if the difference in water levels reduced to values less than delta Z, cavitation is expected to take place. For the other case if the water level at the demand or downstream reservoir is greater than the water level at supply reservoir (most cases), delta Z (Max different in water levels)= NPSH (of the available pump)- (Pa-Pv)/gamma +HL (all head losses) and in this case if the water level at supply reservoir or the well is dropped to lower depth, than the difference in the water levels increased to values more than computed delta Z and we expect cavitation will take place in this situation.

[GerardoSanchezZz]

Thanks for including time stamps in these videos!

[pbpracticobienhecho]

Muchas gracias. Excelente explicación. I am an electrical engineer and these concepts are very useful for me. Thank you very much.

[GenaEnSamIAm]

All I can say is brilliant and thank you.
Thank you for sharing!!

[jeezwheez]

I haven't enjoyed a lecture as i have enjoyed this one!👏🏾👏🏾

[AY-cjkp]

What a great teacher! I am electrical engineer but just enjoy listening and understanding...

[shibanishashin]

This is a beautiful culmination of my pumps course. the clarity of it brings tears to my eyes.