Fluid Mechanics: Series and Parallel Pumps (22 of 34)
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- Опубликовано: 25 авг 2024
- 0:00:15 - Pumps in series and parallel, conservation of mass and energy equations
0:03:01 - Pump head curves for pumps in series and parallel
0:08:18 - Pumps in series and parallel in a pipe system
0:12:35 - Example: Pumps in series and parallel in a pipe system
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This lecture series was recorded live at Cal Poly Pomona during Spring 2018. The textbook is White "Fluid Mechanics (8th edition)."
I'm glad that i know this information from a very bad university by ranking, water resources ing in aleppo university
Uploading this video for public comminity is a realy great work..thank you
I am an aircraft hydraulic mechanic. The particular aircraft I maintain has 2 independent hydraulic systems, each with 2 engine driven hydraulic pumps rated at 3000 psi @ 22.5 controlled by internal compensators. For years I've been told total system flow is limited to 22.5 gpm by the compensators. Thanks to this video, I have ammunition to start an argument when I get to work lol
I'm working and studying part time. If not for these lectures I think I would be lost.
Thank you so very much!
No problem. Our pleasure.
Hi eugene do you have the textbook they used in the class? i would like to request it from you by email if you have the copy
Hi Henry,
No, unfortunately I do not have the textbook.
What a wonderful lecture. Enjoyed and learned a lot from you sir. Thank you very much for the valuable knowledge.
Thank you professor. These lectures are helping a lot for beginners.
Thank you very much this is so productive am not going to fail my exam after-all on pump section .☺
can we have the kind of lecture in every learning institution
?😤
Lectures shouldn't be employed based on Qualifications & Grades but based on Teaching Skills
because at the end of the day it not about how much do you know as a lecture but its about how do you give what you have.
Thank you sir that was really helpful for me
Very good lecture! The professor explains everything in an interesting and clear manner, well done.
Thanks!
@@CPPMechEngTutorials Please if you know what the problem is, tell me
Thanks a lot Professor
Good day, what if the pumps arent identical and you have to construct a curve P1 + P2 in parallel(combined curve). Could you please do an example like that?
What a fantastic lecture 😀
You set the friction factor, f, to 0.025 regarding it as a constant. But I seem to remember that f is a function of Reynolds number which again is a function of the linear velocity of the liquid. So if you are using different values for Q to determine the system curve, then the velocity is not a constant and hence f is not a constant either.
yeah, I have the similar concerning to you. Must be have the separate system curve for each Q.
That is why the system curve is nonlinear and curves upward. If you double the flow you more than double the required head to yield that flow.
you are the best
i just want to say thank you really much. thank you for the hard work
what is the textbook's name he's using?
Thanks a lot sir about pumps
Sir very clear and understandable lecture.
Thank you.
Sir i have a question. For pumps in series to meet suction parameter of second pump.
should we add enough residual head in duty head of first pump to overcome the Npshr of second pump.
And also whether atmospheric pressure will act at input of second pump.
Sir you have done great job. I have learnt alot from it.
Professor is fantastic
But how do we exactly find the operating point? because we know the equation of system curve but we don't know the equation of pump head curve by manufacturer
Can you give us other exercise please sir???👏👏
Excellent teacher👍🏽👏👏👏👏
Thank you so much I just finished fluid mechanics 1
Great timing for you. Some people have been waiting for two years for this lecture series. :)
I think I'm lucky😀! Thank you for everything you helped me a lot with all those lectures
Thank you sir, great lecture!
Thanks!
Thank you very much , you just explained it very well
Such a cool prof
Plz professor.. can explain how did you find 85Q^2
Thank you. It is a great work.
Really well explained
Excellent
efficiency of single pump when working in parallel should be at total flow rate of system divide by number of pumps at the pump system head? and not single pump curve intersecting system curve?
Thank you Doctor for the valuable explanation
You're welcome!
Thank you
efficiency of pump in series should be read at total flow through system but does each pump lift the system head in equal amount,
If my system has 2 identical pumps in parallel, how minimal same pump I can add in series to increase head? Will system work if I add only one pump in series with same capacity to two pumps in parallel?
Great lecture. Just what I was looking for.
Very clear 😊 and thanks
That is very good thank you
I have a question: I have a 1/2" tubing that supply my outside faucet in wich I connected a 3/4" pipe to supply 3 sprinklers head. I have around 8 gpm at the faucet but its just a little to low for those 3 heads. It spray good but radius few foot smaller than with just 1 head or 2... So I want to supply more water to get full radius... But its hard to tell if I should get more pressure or more flow! Since its working fine with less head it looks like the pressure is ok but when the flow increase the pressure is dropping logically...
Then if I ll get more pressure, I must use an inline pump with at least 8 or 10 gpm wich is udge just to get few more gpm... and if I want more flow, I could add another water line that supply the faucet and use a pump on this line. So more flow would be there but the pressure will be the same (if the pump get to high it would return the flow backward). So I was wondering if that additional flow would get to the sprinkler heads or it would change nothing? And since the pressure is the same, the pump would be useless... so that other line would just reduce the pressure drop on that part of the line...so almost no gain... What do you suggest?
What if you put 2 pumps in series to pump against the same head?
This is awesome sir thanks
You're welcome
What if z2 is at lower elevation than z1,will delz be -15...
I have a doubt can I ask here?
Could you share the homework problems
Hp=22.3-aQ2 ---- ⓵
Hs=15+85Q2 ----- ⓶
in single operation
Hp=22.3-aQ2
Hp:19.5m, Q:0.23m3/s
∴a=52.93
Hp=22.3-52.93Q2
in parrel
Hp=22.3-52.93(Q/2)2 ----⓵
Hs=15+85Q2 ----- ⓶
⓵=⓶ Hp=22.3-52.93(Q/2)2=Hs=15+85Q2
∴Q=0.273m3/s, H=21.33m
Thank you sir for the video
todays problem in my work led me to this video
The problem was 2 pumps of different sizes
Pumps A of 20 KW and Pump B of 1 KW are in Parallel Combination
The max Allowed Pressure at discharge is 6Bar
the Circuit is a closed loop mainly for day tank circulation and there is bypass valve at the end of the loop.
Case
Bypass valve 100% closed to ensure the full circulation at the loop with 5 Bar pressure with 1kW pump.
but i have to switch from Pump B to pump A
Can i switch on the pump A without Shutting off pump B or i would have to shut B to start A
Keeping Pressure in 5 bar for which i have to open the bypass to maybe 50% in order to get 5Bar.
Please do reach me
Whatsapp +923152201404
Email danialahmed502@gmail.com
double acting reciprocating pump with a piston diameter of 50.8 mm and a piston stroke of 100 m. works with a speed of 10 Hz and its volumetric efficiency is 75%, pumping a liquid with density of 1200 Kg/m3. If the friction losses are negligible, calculate. 1. The actual mass flow rate (M) of this pump. 2. The slip of this pump in (m'/s) and in (%). 3. t the pump head (H,) is 36 m, what is the required liquid power in horsepower?
Please if you know what the problem is, tell me
Hey this guy is good
We agree!
which textbook is prof using?
Check the video notes.
i don't understand why 21:01 is is 85Q^2
Plug in the numbers for the Hsys equation and simplify it.
Dear Sir,
Could you please share your email ID. I want your help in understanding something that's going on in my project. We have 2 seawater intake pipelines connected to 3 parallel pumps (2W + 1SB) through a common header and on delivery side we have 2 parallel pipelines through a common header. Each pump is designed for 1050 m3/hr flow at 24m head when 1 intake line and 1 delivery line is open . Now when 2 pumps will run simultaneously with both intake and delivery lines are open. What will be the system curve?? Will we get double flow in this case?