Endress+Hauser NXA820 - 8 Calculations; API Flow Charts

Tankvision Calculations
Endress+Hauser 25
8 Calculations
Tankvision Tank Scanner can perform various kinds of calculations which are descriped in
the following chapters. The inventory calculations allow the conversion from measured data
like level and temperature to standard data (e.g. Net standard volume or mass). There are
various standards for these calculations available differing in the sequence of the calculation
or the way compensation factors are determined (from tables or formula). Today
calculations from API (see Text → ä 26) and GB/T (see Text → ä 26) are implemented in
Tankvision Tank Scanner.
8.1 API Flow Charts
The chart shows the sequence calculations are done according to the API. The different steps
are explained in the following chapters.
L00-NXA82xxx-16-00-00-xx-034
Level
Level
Flow
S&WV
FWL
Base Temp.
Ambient temp.
Air density
air density
Product temp.
Hydrom. corr.
Product Code
S&W
Table & Product
Code
Obs. density &
Obs. temp.
Ref. density
FWV
CTSh
Sump/Heel
volume
RemCap AvailVol
TOV
GOV
VCF
WAC
Ref. Density
CSW
GSV
NSV
NSW in air
Liquid Mass/
NSW in VacuumAir
If Ullage
NoGo
Zones
convert to
Innage
calculate
FWV
Floating
API/ASTM
Obs-Ref
density
conversion
S&W
calculation
Roof
Air corr.
calc.
corrections
Calculate
Remain cap.
Calculate
AvailVol
Calculate
TOV
Calculate
EquivArea
Calculate
EquivArea
TankTop
P-TCT
W-TCT
Tank Shell
details
Roof
Details
+
-
1.
Ullage Conversion
2.
Volume calculation
3.
Free Water Volume
calculation
4.
Tank Shell correction
5.
Floating Roof
corrections
7.
Volume Correction
Factor calculation
8.
Sediment & Water
calculations
12.
Flow calculation
6.
Sump/Heel Volume
11.
Net Standard Weight
calculation
9.
Reference Density
Calculation
10.
Net weight in Air
Calculation