Saturation point of water in hydraulic oil

[obg]

Does anyone know of a method of predicting the ppm saturation point (water absorbed in oil) with respect to temperature.

 

[Acajun]

What is the temperature range of the process? Whould a Dewpoint temperature suffice?

Jp

 

[obg]

I am attempting to predict the change of saturation level of Hydraulic oil, with respect to temperature. I have a device that will give me the percentage saturation level over a thermal range of 10 - 70Cº but cannot as yet translate this into PPM.

 

[Acajun]

1% = 10,000ppm

 

[spanahidup]

1%=10,000 ppm
Is this equation suitable for gas? i.e: gas in air

 

[MechTechnologist]

No! 1% saturation is not necesarily 10,000 ppm. In many cases 100% water saturation occurs at only 200ppm at room temperature in hydraulic oil. The relationship between %saturation-water and ppm is different at varying temperatures. This is because oils (like air) can hold more water (ppm) at higher temperatures. Calculating the ppm from the %saturation usually requires a logarithmic formula with both temperature AND %saturation as variables. First, you have to know the saturation curve for your specific oil. Here's an example from the Hydac AquaSensor brochure:
<a href=

http://www.hydacusa.com/literature/....com/literature/fluid_service/tds0011.pdf</a>

So now the question is how to determine that curve. I don't know the answer to that, but be warned: the curve will also change as the fluid and aditives begin to break down.

 

[alexpln]

go to

http://www.lavell.lnk.pl

and download Process Control Calculators...
There is a module Moisture in Liquid Hydrocarbos.