Series 24-HP Instruction Manual

Appendix C Fluid Calculations

 

 

Calculations for Liquid

Use this formula to determine the settings for “Goyal-Dorais” selections

and “Other Liquid” selections entered in the Fluid Menu. The liquid cal- culations were taken from Richard W. Miller, Flow Measurement Engi- neering Handbook (Second Edition, 1989).

Density

The liquid density is found using the Goyal-Doraiswamy Equation. Goyal-Doraiswamy uses the critical compressibility, critical pressure and critical temperature, along with the molecular weight to find the density. The equation for specific gravity is:

G

 

 

pc Mw

0.008

 

 

T f

F

=

 

 

 

 

 

T

Z 0.773

 

 

 

 

0.01102T

 

 

 

c

c

 

 

C

The specific gravity can then be converted into density.

Viscosity

The liquid viscosity is found by Andrade's equation. This uses two vis- cosities at different temperatures to extrapolate the viscosity.

Andrade's equation:

= AL exp

BL

T

 

 

 

 

 

deg R

To find A and B

B

= Tdeg R1Tdeg R 2 ln(1 / 2 )

L

 

Tdeg R 2 Tdeg R1

 

 

AL

=

1

 

exp(BL / Tdeg R1 )

 

 

The temperatures are all in degrees Rankin. Do not believe the subscript

R means they are reduced temperatures.

IM-24-HP

C-3

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Sierra 240-VTP, 241-VTP instruction manual Calculations for Liquid