FuelsManager Defense
312 Administrator Manual
Local Gravity =
Note! Alternatively, the user can
enter the local manually
For convenience, FuelsManager allows for the entry of the tank position in deg/
min/sec of latitude.
The following is used to convert the position in deg/min/sec to the position in
radians.
The position of the pressure transmitter is critical to the hydrostatic and hybrid tank
calculations since the positions can be affected by the thermal expansion or
contraction of the tank. FuelsManager uses the following to correct the installed
height of each transmitter for the effects of temperature.
Both the Hydrostatic and Hybrid methods calculate product density based on the
pressure difference between instruments of known heights, as follows.
Where Elevation is in meters
Air Temp is in °C
(D
A
)Air Density 353 exp
Elevation 8434.41⁄–
Air Temp 273.16+
-------------------------------------------------
×=
Where A = cos(2x Position in Radians)
Corrected Height = Height x [1 + ExpCoeff x (Temp - Installed Temp)}
Where Height = H
t
, H
m
or H
b
ExpCoeff = Thermal coefficient of expansion for the material from
which the tank shell is constructed
Temp = Current product temperature
Installed Temp = Temperature when the pressure instrument was
installed
9.80616 0.025928 A×()–6.910
5–
× A
2
×()+ 3.086 10
6–
× Ele vation×()–
Radians
2 Π×
360
-------------
⎝⎠
⎛⎞
Deg
Mins
60
------------
+
⎝⎠
⎛⎞
×
Secs
3600
------------
⎝⎠
⎛⎞
+=
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