Sir mai gate fluid mechanics ke liye aaya tha... Aapne bahut behtareen tatikhe se adhyapan kiya, mann bahut prasann hua.. Abb mann kr rha hai aur aage jaakar baaki videos dekhne ka
NPSH is more of a mathematical concept which tells about how far your pump is from cavitation. If you are far enough then NPSH has nothing to do with flow. You may say that head available may push the liquid into eye of pump. That is again a different way of explaining a same phenomenon. After all at suction eye there is very low pressure which is generated due to centrifugal action of pump. If pump could not push out the liquid available at impeller, it won't be able to suck liquid even if there is head available.
@@SandeepAcademy9 That is correct! NPSH available is not the correct word as I had mentioned before but actually it is the head that pushes the liquid. And yes low pressure zone is created because the pump pushes the liquid out which is turn is replenished by the head available at the eye of the impeller. Even in self priming pumps, eventually the net head pushes the fluid into the eye of the pump after the low pressure zone is created. Suppose the pump is taking its suction from a vessel which is at a very low pressure, which is less than the pressure created at the eye of the impeller. In such a situation, the pump will not work. If it could suck, it will suck irrespective of the pressure at the suction vessel. I had read somewhere that it is wrong to say that centrifugal pumps suck.
We are describing same phenomena in two different way. Let's not delve into terminology. If pump is taking suction from a well. Then its low pressure at suction eye is available to suck liquid. There is no head available to push....rather pump has to suck against gravity. Where is net head in self priming pump ? (There is NPSH). There is liquid below from the level of pump. In our refinery case where vessel is above the pump in that case liquid push into pump due to head and that will take place even if pump is not running.
I think it's wrong to say that centrifugal pump sucks liquid when vessel liquid level is below Centerline of the pump and Suction nozzle is above that level, But as Sandeep is talking about pump sucks liquid at eye of impeller by creating low pressure it is fine.
Ty sir your all video are very good ,we are very ty for that it's very conceptual and easy understand very helpful for interview preparation ❤️❤️❤️❤️❤️❤️I am always suggest my Friends to watch all video ❤️❤️👌👌
@@mrannihilator3158 ahise. but digboi t bohut competition hobo. oil, ongc, bcpl, fertilizer, hindustan aru bohut ase. digboi r ex lora u bohut ase.. sinta lagise🤔
Thank you. But I have one disagreement with your last comment that power requirement for centrifugal pump depends mainly on flow rate, than the head. Pls clarify if my understanding is wrong. If we look at BHP vs Q curve on the same graph as H vs Q curve, the BHP vs Q curve has small slope with Q axis. This indicates that the BHP is more sensitive to the head than the flow rate and hence BHP should depend mainly on head developed by the pump. Thanks .
Dear sir, I don't get one point why do we need a pump always for pumping corrosion inhibitor in vacuum coloums as there's already a negetive pressure inside the coloumn. Is it that the pressure inside is not appreciable to suck that liquid or is it there is some sprinkler facility inside column to diminish corrosion?
Pump is required to lift corrosion inhibitor from ground floor to the top of column. Fluid flow from high energy to low energy. Though pressure of VDU column is low (Statis pressure low) But potential energy of that point is high due to height. So pump required.
@@SandeepAcademy9 thank you sir for your response sir another query I have heard that ms(motor spirit) pump is prone to very much chances of vapour locking due to its nature then how we prime a pump ms pumps if it's not under gravity suction and if the pump is not self priming?
Sir refinery ka exam aara hai...24 Oct Ko Pumps , compressors,. Valve , columns , furnace , vessels , pipe and joints, stream traps control valve etc sbki knowledge dedo sir pls.........🙏
@@studywithvk526 hai meray pas rs Agarwal , sir joh private training hothi hai diploma base chemical maay uska kya profits hai?plz btao meri hai training
@@SandeepAcademy9 but sir video ke starting me aapne btaya ki velocity kam hoti h or pressure jyada...bina Bernoulli equation lgaye kaise bta skte h...or same head hota tab only we can say ki pressure ke sath velocity reciprocal behave kregi..
Sir, I have one doubt that what happens in the free delivery condition of centrifugal pump such that no head is generated? I mean its clear from Euler Turbomachinary Equation that such a value of flowrate exists when H will be zero, and its evident from pump curves as well which are generated from experimenting. Sir my doubt is that what is the physical significance, or what is actually happening at that time such that H generated becomes zero? The impellers are rotating and providing kinetic energy to the moving fluid, but still no head is generated???
Whatever energy provided by impeller to fluid is loss due to high frictional losses. Frictional losses increase with flow rate. I have discussed it in pump performance curve video.
@@SandeepAcademy9 thanks sir, but my doubt is that even in the euler turbomachinary equation, we have such a Q value where ∆H is zero. But sir euler equation doesnt incorporate friction losses, still its ∆H is zero, sir that is my doubt that even after not accounting for friction losses, still H is decreasing linearly with Q?
There is a condition called end of curve operation where head is very low & flow is very high due which Pump will draw more power to transfer flow but unable to generate head hence there will be a pump motor trip (other wise motor will generate heat & create cavitation of the pump), hence you will never face the situation of 0 Head in pump operation.
![Sandeep Academy [IITR, GATE AIR 1]](http://yt3.ggpht.com/ytc/AIdro_lMrK-nBjYeJxD98jSsSliA2mqqGWTEpJ0forReowJ6S6w=s48-c-k-c0x00ffffff-no-rj)
Sandeep bhai, I think we need to divide by pump efficiency (not multiply) to get motor power. At 32:30.
Sorry bhai....By mistake galat leekh diya hai....You are right efficiency should be in denominator.
Mera 25 nov ko skill test hai refinery par... Apka video dekh raha hu doubt clear karne ke liye... Thanks
Sir mai gate fluid mechanics ke liye aaya tha... Aapne bahut behtareen tatikhe se adhyapan kiya, mann bahut prasann hua.. Abb mann kr rha hai aur aage jaakar baaki videos dekhne ka
Have never listened to anyone who explains like this .. Very knowledgeable and he definitely knows the application level. 🎉
Apka basic concept clear hai or apne mera bhi kiya thanks, ssc je 5th 2024 ke paper me isse question aaya 😊
Apka explanation bahut hi conceptual hota Hai....Thank you sir bahut sare point mere clear hue Hai aha se
Thank you very much sir... You explained it in very interesting way..
This month is soo knowledgeable.. You give 3 video back to back. Thank you sir ❤😇
Very informative video from the industrial point of view
Sirs, We are grateful of yours...thanks
Sandeep ji, kindly put your lectures with slides, that will make it much better to understand. Your way of explanation is very good. Thanks
These days I am teaching on slides only. Earlier students were asking to teach on board.
Dear Sandeep, Centrifugal Pumps do not suck! The NPSH available pushes the liquid into the eye of the impeller. By the way, good video once again!
NPSH is more of a mathematical concept which tells about how far your pump is from cavitation. If you are far enough then NPSH has nothing to do with flow. You may say that head available may push the liquid into eye of pump. That is again a different way of explaining a same phenomenon. After all at suction eye there is very low pressure which is generated due to centrifugal action of pump. If pump could not push out the liquid available at impeller, it won't be able to suck liquid even if there is head available.
@@SandeepAcademy9 That is correct! NPSH available is not the correct word as I had mentioned before but actually it is the head that pushes the liquid. And yes low pressure zone is created because the pump pushes the liquid out which is turn is replenished by the head available at the eye of the impeller. Even in self priming pumps, eventually the net head pushes the fluid into the eye of the pump after the low pressure zone is created. Suppose the pump is taking its suction from a vessel which is at a very low pressure, which is less than the pressure created at the eye of the impeller. In such a situation, the pump will not work. If it could suck, it will suck irrespective of the pressure at the suction vessel. I had read somewhere that it is wrong to say that centrifugal pumps suck.
We are describing same phenomena in two different way. Let's not delve into terminology. If pump is taking suction from a well. Then its low pressure at suction eye is available to suck liquid. There is no head available to push....rather pump has to suck against gravity. Where is net head in self priming pump ? (There is NPSH). There is liquid below from the level of pump. In our refinery case where vessel is above the pump in that case liquid push into pump due to head and that will take place even if pump is not running.
I think it's wrong to say that centrifugal pump sucks liquid when vessel liquid level is below Centerline of the pump and Suction nozzle is above that level, But as Sandeep is talking about pump sucks liquid at eye of impeller by creating low pressure it is fine.
Thank you sir this video and concept about pump . Vertical centrifugal pump ka video bana dijiye please
Very knowledgeable videos . Helped a lot.. thanks
Ty sir your all video are very good ,we are very ty for that it's very conceptual and easy understand very helpful for interview preparation ❤️❤️❤️❤️❤️❤️I am always suggest my Friends to watch all video ❤️❤️👌👌
I am following from 2019 ❤️❤️❤️ you are doing great work for fresher students ❤️
Thanks for sharing videos.
thank you so much sir, we are so grateful to you that you are giving your valuable time to us
Sir pump se related knowledge me aaj extra kuchh add hua thanks.
Please make a video on evaporator and diesel quality parameters .
Can cavitation occur in a positive displacement pump ? Are there any such scenarios where this is possible??
Nice explanation and detail understanding of concept , very good video!
Thank you sir....keep making this kind of informative videos😊
Excellent and easy to understand the concept
Thank you sir 😍😍
love u sir.
need more video
Thank you so much Sir 🙏.
Awesome lecture. 👍🙏
Sir, all video are really good. Learnt a lot. Thank you. Sir, can please also provide guidance about mass transfer process of distillation column?
Great mr sanddep
Sir Agar Ho Sake Toh OP Gupta Main Jitne Mistakes Unko Leke Ek Video Banana ! Bohot Saare Logon Ka Yehi Request Hain ! 🙏
sahi bola yarr. bohut sara galat hain.
Bhaiti Kon Refinery er Pora Apprentice Korisa ?
@@mrannihilator3158 digboi. tumi nu
Bongaigaon er Pora ! Bohut Keita Post Ahise Digboi Ot ! 💛
@@mrannihilator3158 ahise. but digboi t bohut competition hobo.
oil, ongc, bcpl, fertilizer, hindustan aru bohut ase. digboi r ex lora u bohut ase.. sinta lagise🤔
Thank You Sir 🙏
Thank you Sir PUMP per video lane ke ley
Thank you.
But I have one disagreement with your last comment that power requirement for centrifugal pump depends mainly on flow rate, than the head. Pls clarify if my understanding is wrong.
If we look at BHP vs Q curve on the same graph as H vs Q curve, the BHP vs Q curve has small slope with Q axis. This indicates that the BHP is more sensitive to the head than the flow rate and hence BHP should depend mainly on head developed by the pump.
Thanks .
Sir compresser pe bhi video banaiye
Sir please make video on line sizzing and vessel sizzing 🙏
Sir, can u upload video regarding shaft alignment
Interview questions fluid machinery pe bnaiye video
sir kindly clear that how pressure will increase after ourlet.however velocity is decrease due to increasing in area.i cant understand.
Sir reciprocating compressor and dampner ke baare me bhi thora isi style me batayye
Bahut khoob
Area badne se pressure drop hota hai na sir,
Sir please ek video.. Dimensionless numbers par jarur banaiye... H.t. and m.t dono k ..
You are really awesome
More vdo sir this month is very important
Excellent explanation sir
Thanks a lot
Great Work Boss👍🙏
Bahot maja ayaa
Dear sir,
I don't get one point why do we need a pump always for pumping corrosion inhibitor in vacuum coloums as there's already a negetive pressure inside the coloumn. Is it that the pressure inside is not appreciable to suck that liquid or is it there is some sprinkler facility inside column to diminish corrosion?
Pump is required to lift corrosion inhibitor from ground floor to the top of column. Fluid flow from high energy to low energy. Though pressure of VDU column is low (Statis pressure low) But potential energy of that point is high due to height. So pump required.
@@SandeepAcademy9 thank you sir for your response sir another query I have heard that ms(motor spirit) pump is prone to very much chances of vapour locking due to its nature then how we prime a pump ms pumps if it's not under gravity suction and if the pump is not self priming?
@@atifadeez4285 watch my previous videos on NPSH and Troubleshooting.
Thanks a lot sir. very interesting
Good sir ji
Sir petrol pump pe kon sa pump use hota hai
Sir pls make a video on compressor
thank you keep uploading video
Superb sir 🙏🙏
Sir compressor pr bhi video banaiye
Sir refinery ka exam aara hai...24 Oct Ko
Pumps , compressors,. Valve , columns , furnace , vessels , pipe and joints, stream traps control valve etc sbki knowledge dedo sir pls.........🙏
Thank you for uploading sir.
Sir kindly make a video on psu privatisation...and what to do to get job in psu hereafter through gate pls...
Sir isi trah Compressor par bhi vedio banayiye
Compressor works on same principle. Waha surging Aur choking hota h....uspe pahle se hi 1 video bana rakha h...
Sir reactor ke upor video banaye
Excellent explanation Sandeep Bhai :)
outstanding ♥️
Well explained
Sir thank you very muchhhhhhhhhh
Super 💕... Sir 🙏
Sir chemical engineering diploma wale bahr sakte hai please reply 🙏🙏🙏
Sir where is your video on desalter, I am not able to find it, have you removed it ?
Yes, I had to delete it because of copyright issue.
Thank you sir.
Sir is this for gate Or only imp for interview??
Both
@@SandeepAcademy9 thank you sir
Thankyou sir
Why use vertical centrifugal pump in industry
Aapse jo fluid machinery nahi padha hoga wo engineer Kahane Layak hai hi nahi😂
Sir diploma chemical engineering ko apperantice or JE exam kay liya math kis level ka or konsi book use karay btao sir plz🙏
Modrate lavel ki math hogi
RS Agrawal ki book le lo
@@studywithvk526 hai meray pas rs Agarwal , sir joh private training hothi hai diploma base chemical maay uska kya profits hai?plz btao meri hai training
❤
sir please compressur and type per ek detai se video provide kijiye
Sir discharge line ka size 99.99% cases small hota h as compare to suction line..
Yes
@@SandeepAcademy9 but sir video ke starting me aapne btaya ki velocity kam hoti h or pressure jyada...bina Bernoulli equation lgaye kaise bta skte h...or same head hota tab only we can say ki pressure ke sath velocity reciprocal behave kregi..
Sir mechanical seal plan pe video banaiye please
Bhai banaya tha copyright issue aa gaya tha....ab bina diagram ke kaise padha sakte hai seal plan ?
@@SandeepAcademy9 ok sir thanks for responding
👍👍👍
👍
Spider kitne kype ka hota he
Sir, I have one doubt that what happens in the free delivery condition of centrifugal pump such that no head is generated?
I mean its clear from Euler Turbomachinary Equation that such a value of flowrate exists when H will be zero, and its evident from pump curves as well which are generated from experimenting.
Sir my doubt is that what is the physical significance, or what is actually happening at that time such that H generated becomes zero? The impellers are rotating and providing kinetic energy to the moving fluid, but still no head is generated???
Whatever energy provided by impeller to fluid is loss due to high frictional losses. Frictional losses increase with flow rate. I have discussed it in pump performance curve video.
@@SandeepAcademy9 thanks sir, but my doubt is that even in the euler turbomachinary equation, we have such a Q value where ∆H is zero. But sir euler equation doesnt incorporate friction losses, still its ∆H is zero, sir that is my doubt that even after not accounting for friction losses, still H is decreasing linearly with Q?
There is a condition called end of curve operation where head is very low & flow is very high due which Pump will draw more power to transfer flow but unable to generate head hence there will be a pump motor trip (other wise motor will generate heat & create cavitation of the pump), hence you will never face the situation of 0 Head in pump operation.
@@abhrajitsaha7 For backward curved blade only.For forward curved impeller blade H will increase with Q.
Sir yeh naji samjh aaya ki kyu centrifugal pump low head devlop karega
Some wrong information
Pinpoint what are wrong information?
Thanku very much sir
Thank u sir .