NPSHa CALCULATION ON ASPEN HYSYS | HOW TO DO NPSHa CALCULATION FOR CHEMICAL PROCESS ENGINEERS

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[@colinhwang175]

Hello.
Appreciate for helpful video.
I have a question. If we apply bubble point pressure (@saturated condition) in Hysys, it is not true vapor pressure and it means that more severe NPSHa calculation result will be conducted. Because most pumping fluid is sub-cooled condition. Am I right??

[@jefersoncostaengineer]

Hi Colin, I am not sure if I understood your question 😅
NPSHa can be understood as how far you are from your liquid vaporization. This way, you consider the vapor pressure of the fluid in the NPSHa calculation.
Think about it, a liquid in saturated condition refers to its surface. As you increase the column of liquid, at the "same" temperature, the liquid will be subcooled. Because pressure at the bottom is higher than pressure at liquid surface. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point.
True vapor pressure (TVP) is a common measure of the volatility of petroleum distillate fuels. It is defined as the equilibrium partial pressure exerted by a volatile organic liquid as a function of temperature as determined by the test method ASTM D 2879.