NPSHA CALCULATION WITH EXCEL SPREADSHEET AND ASPEN HYSYS | PUMP NPSH BASICS | NPSH FOR BEGINNERS

[@abdelilahbaghdadi8941]

Dear Jeferson. Many thanks for all your valuable process courses. I would like to highlight that in example 5.2, You specified in the Excel spreadsheet the process pressure as 258 in kpa (absolute) while 258 kpag (gauge) is given in the sketch. Please check and revert.

[@jefersoncostaengineer]

Hi, in the spreadsheet was missing the "g" in the pressure information (line 20). This information is gauge pressure as informed in the sketch. Thanks for the alert. I will fix the units of measurement in the spreadsheet. In any case, the calculation in the video is correct. Good catch :)

[@custodiosantos8384]

Thank you for sharing your knowledge.

[@jefersoncostaengineer]

My pleasure 😇

[@rahilreda6904]

Dear Sir , thank you a lot for this explanation , i have just one question : in the munit 20:03 , you have talked about the calculation of NPSHa by Hysys software : you have said that the P1 : is the inlet pressure at the pump suction and as we know this value normaly shall including ( absolute pressure at the vessels - pressure loss +- static pressure of the static head ) how we can get the same value as the excel sheet calculation by adding the dynamic pressure ( V2/2G ) , when we can consider this dynamic pressure , and why you have not consider this value in exceel sheet ? NPSH-A = (((Pvessel-Pv)/ρ)x10.2)+Hz-Hf+(V²/2g) , thank you very much

[@jefersoncostaengineer]

Hi, dynamic pressure is based on pump nozzle. In the preliminary calculation pump was not selected, and pump nozzle is not available. Moreover, ignoring dynamic head will drive us to safe margin. For all these reasons, we usually perform NPSHa calculation without dynamic pressure.

[@warnme2001]

TQ for sharing your knowledge. Is there a different NPSH calculation for reciprocating pump? 🤔

[@jefersoncostaengineer]

Hi for reciprograting pump, the chemical process engineer must subtract an additional term related to the reciprocating pump acceleration head. NPSHA = pg + pz - pvp - pf - pac

[@adedirefisayo682]

Thank You Mr Costa

[@jefersoncostaengineer]

Thanks a lot for the feedback 😁

[@nicholashassan2025]

Thank you for this excellent information. What if we are to take distilled water at 1 Bar absolute on the suction side of a pump at 100 degrees centigrade, what is the calculation?

[@jefersoncostaengineer]

The procedure is the same. As the fluid is at saturated conditions, you will work on the elevation of your vessel/column or eventually you can consider cooling the stream before pump suction.

[@abdulazizal-shamli155]

Thank you a lot mr. Jeferson , but from where I can get the excel sheet ?

[@jefersoncostaengineer]

Hi, excel sheet will be available once on Telegram channel INProcess once like target is achieved 😇

[@abdulazizal-shamli155]

@@jefersoncostaengineer please we waiting once it is available

[@jefersoncostaengineer]

Thanks a lot for your support :)

[@engineertakeyaldeenal-haj6761]

​@@abdulazizal-shamli155did you get it ?

[@reem78022]

Hello sir, I'm trying to get the data from PV of controllers and export it to Excel so that it transfers the data automatic in the dynamic state. How can I do that?

[@jafarramadan9858]

How can i find your Excel sheet calculation please?

[@jefersoncostaengineer]

Usually I let materials available at my telegram channel. here is the link t.me/chemicalprocessengineer. Otherwise, they are available only for my Inprocess Booster students 😇

[@engineertakeyaldeenal-haj6761]

Can't find sheet calculations ​@@jefersoncostaengineer

[@engineertakeyaldeenal-haj6761]

Sheet calculation plz.