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Series 24-HP Instruction Manual Appendix C Fluid Calculations
IM-24-HP C-3
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:
−=
C
f
cc
c
F
T
T
Z
T
Mwp
G 01102.0
008.0
773.0
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:
R
L
L
T
B
A
deg
exp=
µ
To find A and B
1deg2deg
212deg1deg
)/ln(
RR
RR
L
TT
TT
B
−
=
µ
µ
)/exp(
1deg
1
RL
L
TB
A
µ
=
The temperatures are all in degrees Rankin. Do not believe the subscript
R means they are reduced temperatures.