Calculation of NPSH (Net Positive Suction Head)
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- Опубликовано: 5 окт 2024
- NPSH- Net Positive Suction Head
Introduction of NPSH.
NPSH can be defined as the difference between the NPSH available (NPSHA) at the pump’s inlet and the NPSH required (NPSHR) by the pump to operate without cavitation.
NPSH Available (NPSHA): The absolute pressure at the suction port of the pump.
NPSH Required (NPSHR): The minimum pressure required at the suction port of the pump to keep the pump away from cavitation. (This is specified by vendor/manufacturer)
Introduction of Cavitation.
Cavitation is the formation of bubbles at the pump inlet, followed by their sudden collapse, which can cause permanent damage. The NPSH margin value must be positive to avoid cavitation.
NPSH = NPSHA - NPSHR
NPSHA = Liquid pressure at pump suction - Vapor pressure of liquid.
NPSHA = Absolute pressure (at surface of reservoir) - Liquid Vapor pressure - Loss in piping, valves +/- Static Head
Case-1- If the pump is installed below the suction reservoir level.
Case-2- If the pump is installed above the suction reservoir level.
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Good video, but I would like you to check the conversion of 14.7psi to feet, =14.7*2.31= 33.957 feet, but you used that of the first question instead.
Most knowledgeable video very very thankful for sharing your knowledge ❤❤❤❤
Concept clear thnx sir
Very knowledgeable video
Thanku brother
Wahh Guru zabardast
Thank you
Keep going 👍
Thankyou bro
Sir ,How to calculate closeloop system (chilled water system) how to calculate NPSH.
Sir request to you please share mechanical seal and glass lined reactor in chemical industry
Sure. 🙂
Well done
Thankyou
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