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Appendix C Flow Meter Calculations Series M22/M23/M24 Instruction Manual
C-6 M-000-00010
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 (Third Edition, 1996) .
Density
The liquid density is found using the Goyal-Doraiswamy Equation. Goy-
al-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:
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:
To find A and B
The temperatures are all in degrees Rankin. Do not believe the subscript
R means they are reduced temperatures.






− =
C
f
c c
c
F
T
T
Z T
Mw p
G 01102 . 0
008 . 0
773 . 0
R
L
L
T
B
A
deg
exp
=

1 deg 2 deg
2 1 2 deg 1 deg
) / ln(
R R
R R
L
T T
T T
B
−
=
 
) / exp(
1 deg
1
R L
L
T B
A

=