ONICON F-2600 - Manual (Page 126)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page B-5
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 calculations were taken
from Richard W. Miller, Flow Measurement Engineering Handbook (Third Edition,
1996).
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
F
=
p
c
Mw 0.008
-0.01102
T
f
T
c
Z
c
0.773 T
C
The specific gravity can then be converted into density.
Viscosity
The liquid viscosity is found by Andrade’s equation. This uses two viscosities at
different temperatures to extrapolate the viscosity.
Andrade’s equation:
μ = A
L
exp
B
L
T
degR
To find A and B
B
L
=
T
degR1
T
degR2
ln (μ
1
/ μ
2
)
T
degR
A
L
=
μ
1
exp (B
L
/T
degR1
The temperatures are all in degrees Rankin. Do not believe the subscript R means
they are reduced temperatures.
( )