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.
Entire concept is less vapor or beyond the saturation for unsaturated vapor and that is concept, I am not able to remember if I said , but I hope you understand the whole concept
If you are somehow able to create a perfect vacuum, you can only lift a column of water 32.8 feet (9.997 meters) at sea level due to the atmospheric pressure that exists there. Not sure if you looking for the same, thanks a lot for visiting us
well explained, i was literally struggle for 2 days, but with your explanation was able to creat a hamburger model of the water pump in less than 15 mins, you really deserve a like and subscribtion
Thanks so much my name is Med Signal i love the teachings about pumps centrifugal and positive displacement pumps I work in the mining section i work with this pumps pls friends I will follow-up with this teachings each and every time nice to meet.
