superb explanation till now I have searched more than 15 websites, 10 youtube channels, unacademy, McCabe smith and cengel also. But your explanation made the concept clear
Cavitation does not occur due to liquid to vapor formation. It happenes when pressure increases again and vapor again try to be in liquid phase. These liquid collapse and implode into the metal surface and cause the erode to the metal surface.
why have you added v2/2g with the NPSH last formula after explaining it's justthe difference between suction pressure head and vapour pressure head. Didn't get you there. kindly respond
I think the velocity head term in the final equation can be omitted because NPSH is determined, like you say, by the condition that point 2 is at vapor pressure so cavitation is about to occur. If cavitation is happening, v2 goes to 0.
Your explanation is incorrect. NPSH is defined as the Absolute STAGNATION Pressure head at the pump suction minus the absolute vapor pressure head. You are all over the place but it appears you are making the (unfortunate) common mistake of defining it as the absolute STATIC pressure head at the pump suction minus the absolute vapor pressure head. It is wrong in Mark's handbook (at least my edition) if that was your reference. I recommend going to the Pump's Handbook or any good undergraduate text for a correct understanding of NPSH. You can also call a pump manufacturer, they love to discuss this stuff.
vapor pressure at any given temperature is defined as the pressure exerted by the vapour in equilibrium with the liquid at that temperature ....then how it becomes the pressure at which liquid convert to water vapour..
Hi Sir, could you explain the NPSH for Vertical Suspended Pumps (VS4/ VS5). NPSHA calculation and checking the vendor datasheet/GA from customer point of view.
Please can you explain with real life example means I have a pump delivering fluid at some rate. I want to understand how can we say that the pump is under cavitation or not. request to respond
you cannot relocate pump when it is already installed. you can increase liquid level to increase NPSHa to avoid cavitation. when you are designing a pump for new plant then you have a choice to relocate pump to increase inlet head.
superb explanation till now I have searched more than 15 websites, 10 youtube channels, unacademy, McCabe smith and cengel also. But your explanation made the concept clear
It is v²/2g in Bernoulli's equation.
Great! Very informative. Now clear the actual point of view of NPSH. Thanks a lot from Bangladesh.
Respected sir I think velocity head will be 2g in denominator 👍
Excellent explanation! This is very much appreciated.
Cavitation does not occur due to liquid to vapor formation. It happenes when pressure increases again and vapor again try to be in liquid phase. These liquid collapse and implode into the metal surface and cause the erode to the metal surface.
why have you added v2/2g with the NPSH last formula after explaining it's justthe difference between suction pressure head and vapour pressure head. Didn't get you there. kindly respond
Same doubt if anyone know it please respond
Short and simple yet efficient. Thank you.
Great explanation. I have searched many videos and channels, but did not find such a lecture. Thanks bro
Sir kya bolun yr u r ossom in many ways sir God bless u sala aajtak mujhe SMjh nhi aya par today only because of u
I think the velocity head term in the final equation can be omitted because NPSH is determined, like you say, by the condition that point 2 is at vapor pressure so cavitation is about to occur. If cavitation is happening, v2 goes to 0.
Absolutely.
Very helpful video .....please make more conceptual videos like this . All doubts cleared thank you....
Sir concept bht sahi. Clear ho gya.. really sir...no words for u... thanks a lot sir..
V2÷2g not v2÷¶g
In final step he corrected bro
Your explanation is incorrect. NPSH is defined as the Absolute STAGNATION Pressure head at the pump suction minus the absolute vapor pressure head. You are all over the place but it appears you are making the (unfortunate) common mistake of defining it as the absolute STATIC pressure head at the pump suction minus the absolute vapor pressure head. It is wrong in Mark's handbook (at least my edition) if that was your reference. I recommend going to the Pump's Handbook or any good undergraduate text for a correct understanding of NPSH. You can also call a pump manufacturer, they love to discuss this stuff.
SHORT AND SIMPLE
Once you have taken v^2/2g at suction then why you use again adding v^2/2g in PV/$g
Clearly explained sirrr thank you ❤
Best explanation sir👌
Xcellent
Why V^2/2g is added please explain any one it will be so kind of y please
oh brother, you did really awsome thing!!
thanks for the video
Good and clear explanation
Well explained in a simple manner.thank you.
Nicely explained Sir!!
Kindly post a video solving a problem related to finding the size of prime mover of pump.
very nice explanation
Excellent video sir.
Excellent. , knowledgeable
Many thanks for such an amazing clarification!
Thanks a lot...💓
U r great sir lots of love to u
please explain for positive suction as you explained for negative suction
Thank you
Excellent explanation! THANK YOU!
💕💕💕💕
Good explanation sir
Clear explanation
Thanxx
vapor pressure at any given temperature is defined as the pressure exerted by the vapour in equilibrium with the liquid at that temperature ....then how it becomes the pressure at which liquid convert to water vapour..
Good explanation tq
Sir final eq me to v2^2 / 2g cancel ho ja ra h ...And final ek k ek step pahle v2^2 / 2g ko kyu add kiye wo samajh ni aaya ache se
at the beginning, velocity of the liquid is termed as v2, later v2 is velocity of the impeller
Very well said
Wow nice explanation👏
Hi Sir, could you explain the NPSH for Vertical Suspended Pumps (VS4/ VS5). NPSHA calculation and checking the vendor datasheet/GA from customer point of view.
You're all videos are very helpful if possible add the last topic which is remaining named as characteristics curves of it. Thanks a tonne of lot
Good explanation sir❤️❤️
Sir.. In Bernoulli equation... It should be v² /2g
Very well explained!!
Good job ..love frm nepal...
Please can you explain with real life example means I have a pump delivering fluid at some rate. I want to understand how can we say that the pump is under cavitation or not. request to respond
Thank you sir for better explanation, what is the difference between limiting height of suction height and NPSH ??
Hello Sir,
Do we need to add atmospheric pressure to the pressure in the manometer at the suction while considering NPSH?
Is too much npsh available good
For e.g npsh required=10ft and npsh available=100ft
Pls reply
Why do we add the velocity term in NPSH?
It's V2/2g.
How you avoid the cavitation, by changing the static head or the pump location ?
you cannot relocate pump when it is already installed. you can increase liquid level to increase NPSHa to avoid cavitation.
when you are designing a pump for new plant then you have a choice to relocate pump to increase inlet head.
good explanation. good job
Useful video. But made a mistake in the equation and corrected at the end. Should be more careful while writing equations.
What about positive section
Good explanation. Plz explain NPSH in steam turbines .😁
If vapour pressure of particular liquid more than the suction head pressure then what will be done.
Plz do make videos on other subjects of Mechanical engineering too!!!
In book static head is added in the formula.But you didn't add
Why have you not considered z2 in final NPSH formula....? Why only velocity head ?
z2 goes to Hs
nice sir
The term hs may varies with -ve or +ve sign?
I have a sump that’s is above the pump existing NPH is 22 can I replace it with 18 ft?
NPSH
Sir final value mein v2^2÷2g cut zaayegaa naa?
Reply sir?
Thank you sir
sirji Bernoulli's equation to theek likho yr!
How to calculate NPSH, if sump level is above the impeller eye
V2/2g not row.g
How much is v2
Impeller ko fig. Wrong hai
thank you
Hi, is this npsh r or npsh a
Cavitation creates more problem for impeller than the suction pipe..there will be more wear and tear of impeller and more noise too .
how to determine NPSH 3% or what we say NPSHR and what should be the NPSH margin ratio for pumps watch this ruclips.net/video/L_kAv0wpST8/видео.html
Below
V2/2G....THATS KINETIC HEAD
You are факing инdus
Pv √
not ¶v ×
Plz make videos only when you know the concept very well. Don't make it just for the sake of making. Complete wastage of time.
v.bad teacher