ATD2 10511 - Hybrid Calculation; Hydrostatic Calculations

Hydrostatic & Hybrid Tank Calculations
ADM003GVAE1005 313
Hybrid Calculation
The calculation for the height ΔH depends on whether FuelsManager is
configured to use a top pressure instrument or not.
Hydrostatic Calculations
The calculation for the height ΔH depends on whether FuelsManager is
configured to use a middle pressure instrument or not.
For hydrostatic calculations it is also necessary to calculate the level value from
the measured pressures:
Where P
b
= Bottom Pressure
P
T
= Top Pressure
G
L
= Local Gravity
D
V
= Vapor Density
D
A
= Air Density
L = Product level
H
b
= Corrected height of bottom pressure instrument
If the top pressure is used: ΔH = H
t
- H
b
If the top pressure is not used: ΔH = 0
Where P
b
= Bottom Pressure
P
T
= Top Pressure
G
L
= Local Gravity
D
V
= Vapor Density
D
A
= Air Density
H
b
= Corrected height of bottom pressure instrument
H
m
= Corrected height of middle pressure instrument
If the middle pressure is used: ΔH = H
m
- H
b
If the middle pressure is not used: ΔH = 0
(D) Density
P
b
P
t
–()G
l
D
v
D
A
–()×()– ΔH×
G
L
L H
b
–()×
------------------------------------------------------------------------------------
D
v
+=
(D) Density =
P
b
P
t
–()G
L
D
v
()D
A
–×()– ΔH×
G
L
H
m
H
b
–()
--------------------------------------------------------------------------------------
D
V
+