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
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
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.
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.
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..
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.
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 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.
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
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
Great! Very informative. Now clear the actual point of view of NPSH. Thanks a lot from Bangladesh.
Great explanation. I have searched many videos and channels, but did not find such a lecture. Thanks bro
Short and simple yet efficient. Thank you.
Excellent explanation! This is very much appreciated.
It is v²/2g in Bernoulli's equation.
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
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
oh brother, you did really awsome thing!!
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..
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.
Respected sir I think velocity head will be 2g in denominator 👍
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.
Best explanation sir👌
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..
Many thanks for such an amazing clarification!
Well explained in a simple manner.thank you.
Clearly explained sirrr thank you ❤
Good and clear explanation
U r great sir lots of love to u
very nice explanation
Excellent video sir.
Excellent. , knowledgeable
Once you have taken v^2/2g at suction then why you use again adding v^2/2g in PV/$g
Excellent explanation! THANK YOU!
Wow nice explanation👏
Clear explanation
Nicely explained Sir!!
Kindly post a video solving a problem related to finding the size of prime mover of pump.
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 job ..love frm nepal...
Very well explained!!
SHORT AND SIMPLE
Hello Sir,
Do we need to add atmospheric pressure to the pressure in the manometer at the suction while considering NPSH?
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.
Good explanation sir❤️❤️
thanks for the video
Good explanation sir
Very well said
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
Good explanation tq
V2÷2g not v2÷¶g
In final step he corrected bro
good explanation. good job
Is too much npsh available good
For e.g npsh required=10ft and npsh available=100ft
Pls reply
please explain for positive suction as you explained for negative suction
Sir.. In Bernoulli equation... It should be v² /2g
Why V^2/2g is added please explain any one it will be so kind of y please
Thanks a lot...💓
Thank you sir for better explanation, what is the difference between limiting height of suction height and NPSH ??
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.
Xcellent
Why do we add the velocity term in NPSH?
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.
Why have you not considered z2 in final NPSH formula....? Why only velocity head ?
z2 goes to Hs
If vapour pressure of particular liquid more than the suction head pressure then what will be done.
I have a sump that’s is above the pump existing NPH is 22 can I replace it with 18 ft?
NPSH
Plz do make videos on other subjects of Mechanical engineering too!!!
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
Sir final value mein v2^2÷2g cut zaayegaa naa?
Reply sir?
Good explanation. Plz explain NPSH in steam turbines .😁
The term hs may varies with -ve or +ve sign?
Thanxx
nice sir
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
Thank you sir
It's V2/2g.
In book static head is added in the formula.But you didn't add
How to calculate NPSH, if sump level is above the impeller eye
Hi, is this npsh r or npsh a
thank you
sirji Bernoulli's equation to theek likho yr!
How much is v2
V2/2G....THATS KINETIC HEAD
Below
V2/2g not row.g
Impeller ko fig. Wrong hai
how to determine NPSH 3% or what we say NPSHR and what should be the NPSH margin ratio for pumps watch this ua-cam.com/video/L_kAv0wpST8/v-deo.html
Cavitation creates more problem for impeller than the suction pipe..there will be more wear and tear of impeller and more noise too .
Pv √
not ¶v ×
You are факing инdus
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
Thank you