Traditional tank calculations
ADM003GVAE1005 289
Where:
Note! In the Critical Zone,
Between Roof Landed Height and
Roof Floating Height,
FuelsManager applies the full
amount of the FRA.
Bottom Sediment Water (BS&W)
Product samples are periodically taken to determine its quality and purity.
Analyzing these samples results in a purity measurement referred to as
percentage bottom sediment and water (%BS&W). The operator usually manually
enters this value. The %BS&W value differs from the Water volume and Solids
volume values in that, the %BS&W impurities are suspended in the product, the
water and solids volumes have settled and rest at the bottom of the tank.
Volume of Sediment and Water (VSW)
This is the volume associated with the percentage of impurities suspended in the
product (%BSW) and is calculated as follows:
Where:
Free water
This is the amount of water in the bottom of the tank and Tank Bottom Solids (if
any). This is calculated as follows:
FRW: Floating Roof Weight
If the 4th digit after decimal point of density is other than ZERO
such as ρ15 ≠ X.XXX0 (4th digit after decimal is 1~9).
If ρ15=X.XXNX then, the density will divided by Low and High.
Low density is ρ15L =X.XXN0 and High density is ρ15H = X.XXN0 + 0.001
FRAL = FRW / ρ15L (Rounding 4th digit after decimal point)
FRAH = FRW / ρ15H (Rounding 4th digit after decimal point)
VSW = (TOV - FW) x (%BSW/100.0)
VSW = Volume of Sediment and Water
TOV = Total Observed Volume
%BSW = Percentage of Bottom, Sediment and Water
FW = H20VOL + SOLVOL
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