Hydraulic Fluids with minus temperature

[axial]

I have been trying to calculate the pressure drop at minus temperature using the standard pressure drop caculation through piping and hosing. What I am finding is that the calculation does not work with the Cst of mineral oil based fluids at temperatures below 32 degrees F down to -20 degrees F. Can someone help?

 

[TD2K]

The calculation should work unless at the lower end of your temperature range you are approaching the pour point of the oil which is possible for mineral oils I suppose. Bascially, at the pour point, the oil's viscosity gets high enough that essentially dP required to flow it is unreasonably high.

Can you post some more information on the oil (viscosity versus temperature) and also some more details on what you mean by 'the calculation doesn't work).

 

[axial]

TD2K
I have posted the response as a new subit question and is titled Hydraulic Fluids at minus temperatures TD2K response.
I did this hoping that you would see it. I included the calculations that I am using. I hope you can respond to that calculation a advise me if I need to factor somthing else into it.

 

[TD2K]

Axial, I did spot your repost this morning (I've been out of town on business the last couple of days hence my lack of response). Let me take a look at it this weekend.

 

[axial]

Thanks TD2K