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Olusoji Martins
Participant

Join Date: Nov 2012
Posts: 3

Pumping System - Vapour Pressure

11/20/2012 9:08 AM

Hello everyone,

I wish to know how to determine vapor pressure of fluid to be used in pump system calculation for NPSHA and HHP.

Many thanks in advance.

Olusoji
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Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#1

Re: Pumping System - Vapour Pressure

11/20/2012 9:20 AM

I don't have an direct answer to your question, but believe these LINKS will add to your knowledge base.
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lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Pumping System - Vapour Pressure

11/20/2012 9:50 AM

It's probably on the MSDS for the fluid.

If all else fails, call the supplier of the fluid.

Or, Two of the 881,000 examples found on the web.

  1. Raoult's Law Example Problem - Calculating Vapor Pressure ...

Calculating the vapor pressure of a solution? - Yahoo! Answers
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IRSHAD
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Join Date: Nov 2008
Posts: 121
Good Answers: 4
#3

Re: Pumping System - Vapour Pressure

11/21/2012 1:50 AM

Vapor pressure will be saturation pressure corresponding to the temperature. This we can get from the steam tables .
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welderman
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Hobbies - DIY Welding - New Member

Join Date: Sep 2007
Posts: 1601
Good Answers: 58
#4
In reply to #3

Re: Pumping System - Vapour Pressure

11/21/2012 8:51 AM

Steam tables supply vapor pressure for water. Vacuum pumps generally use fluids with much lower vapor pressure than water, often mineral or synthetic oils. Vapor pressure for those materials is given on manufacturers MSDS or their data sheets.
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