At 21:14 on Your presentation "NPSHr > NPSHa " . it is not correct for the NPSHr (Net Positive Suction Head required) to be greater than the NPSHa (Net Positive Suction Head available). In fact, for a pump to operate properly and avoid cavitation, the NPSHa must be greater than or at least equal to the NPSHr. This can be expressed as: NPSHa≥NPSHr If the NPSHa is less than the NPSHr, the pump will likely experience cavitation. Cavitation occurs when the pressure in the pump falls below the vapor pressure of the liquid, causing the liquid to vaporize and form bubbles. These bubbles can collapse violently when they move into higher pressure areas within the pump, potentially causing damage to the pump impeller and other components, reducing efficiency, and causing noise and vibration. To ensure safe and efficient pump operation: NPSHa: The actual pressure head available at the pump suction, considering atmospheric pressure, static head, velocity head, and subtracting vapor pressure and friction losses. NPSHr: The minimum pressure head required by the pump to avoid cavitation, specified by the pump manufacturer. Always make sure that: NPSHa≥NPSHr Anyway your presentation is excellent .... Thank you so much.
Great effort for animated presentation. For correction, rotation arrow is supposed to be counter flow or backward-inclined flow. As per Bernouli's principle when the velocity increases the pressure should decrease to balance the flow. And to avoid cavitation pump NPSH-R should be less than to what is available (NPSH-A)..Ergo NPSH-A > NPSH-R..Nicely presented just need some corrections.
![Coheed and Cambria - Searching for Tomorrow [Official Video]](http://i.ytimg.com/vi/hDsYGLbmadg/mqdefault.jpg)
At time 21.14 : please read NPSHa>NPSHr: we will make a detail video on relationships
At 21:14 on Your presentation "NPSHr > NPSHa " . it is not correct for the NPSHr (Net Positive Suction Head required) to be greater than the NPSHa (Net Positive Suction Head available). In fact, for a pump to operate properly and avoid cavitation, the NPSHa must be greater than or at least equal to the NPSHr. This can be expressed as:
NPSHa≥NPSHr
If the NPSHa is less than the NPSHr, the pump will likely experience cavitation. Cavitation occurs when the pressure in the pump falls below the vapor pressure of the liquid, causing the liquid to vaporize and form bubbles. These bubbles can collapse violently when they move into higher pressure areas within the pump, potentially causing damage to the pump impeller and other components, reducing efficiency, and causing noise and vibration.
To ensure safe and efficient pump operation:
NPSHa: The actual pressure head available at the pump suction, considering atmospheric pressure, static head, velocity head, and subtracting vapor pressure and friction losses.
NPSHr: The minimum pressure head required by the pump to avoid cavitation, specified by the pump manufacturer.
Always make sure that: NPSHa≥NPSHr
Anyway your presentation is excellent .... Thank you so much.
Great effort .. hanks for the information .. one point to be corrected if possible: NPSHa > NPSHr
Rightly pointed out, it’s an error at the last minute, actually we have a plan to post second video where these details will be captured, thanks
Good Luck and waiting for your new video :)
Thank you for such a clear and easy to follow presentation
Great effort for animated presentation. For correction, rotation arrow is supposed to be counter flow or backward-inclined flow. As per Bernouli's principle when the velocity increases the pressure should decrease to balance the flow. And to avoid cavitation pump NPSH-R should be less than to what is available (NPSH-A)..Ergo NPSH-A > NPSH-R..Nicely presented just need some corrections.
Thanks the error is at last few seconds and we have already acknowledged thanks
NPSHa > NPSHr
Why?
In last, You said the NPSHR must greater than NPSHA. If available is less than required, how it works?
This is a mistake … at the last second…🙏 will make second video for all these details
Great video hats thanks ❤
Very very thanks for sharing valuable knowledge , I request to you please upload about mechanical seal configuration and plan
Thanks a lot
Wow keep it up
Thank you so much for visiting us❤️❤️❤️
I think also in the case of a pump below the suction point at the base of a reservoir tank, the fluid head in the tank should be considered as well
many thanks for This video and all information but i have a notice NPSHA always bigger than NPSHR
Correct, it’s a line at the last moment .. error.. we will make second part in details
Nice Explanation, Thank you
Thank you so much
Please upload more videos about mechanical seal, and glass lined reactor
Nice explanation.
Thanks a lot
How come velocity and pressure can be increased at the same time 🤔
😄
He is not following Bernouli's principle. He has his own principle..lol
What if the suction source is above the pump?
Net Negative Suction Head
Suction pressure is P2 and not th total pressure ...the dynamic pressure V²/2g should be not added but subtract from Pa🙏
Thanks for visiting us
19:34
Shouldnt be killing humans though
🙃
Who is this guy ? Bro go home 😂