API Factors for hydraulic oils? 1

[jmw]

Using the API calculation of base density from the density at another temperature, the factors used are:

Product Density range K0 K1
Gasolines 654 779 346.42278 0.43884
Kerosines 779 839 594.5418 0
Fuel Oils 839 1075 186.9696 0.48618
Crude Oil 771 981 613.97226 0

If I want to determine the base density of hydraulic oils are are these factors OK or are there any better values for ko and k1 to use?

JMW

http://www.ViscoAnalyser.com

 

[romke]

as far as i know this conversion was basically developed for fuels and crude. although hydraulic oils fall say in a density bracket of 860 - 890, they differ in composition from crudes, containing usually more straight and branched paraffinic components and less aromatics and cyclic paraffinics.

there is another way of calculating the sought after density with the following formula:

dx=d15.[1-0.0007(Tx-15)]

with dx=density at temperature x, d15 is density at 15 degrees C, 0.0007=volume-temperature expansion coefficient, Tx the temperature at which the density has to be calculated in deg C.

This formula is usually sufficiently adequate for lubricants based on mineral oil in say a temperature bracket of 0 to 120 degr C.

 

[jmw]

Thanks Romke

JMW

http://www.ViscoAnalyser.com