How to calculation the bunker quantity in Bunker survey

The bunker calculation is simple and needs the following:

– Tank Sounding data and Tank Capacity Table. The Corrected Sounding means below is the sounding after correcting with vessel’s trim and list.

– Temperature of Oil on Tanks,

– Oil Density @15*C,

– Table ASTM 54B (VCF) and Table ASTM 56 (WCF).

Now we could go with sample of 1 tank to test the calculation.

Input parameter for bunker quantity calculation:

FO Tank No. 1 Center, Corrected Sounding = 3.27 Meter,

Temperature = 34*C,and density @ 15*C = 0.9903 (given density).

Tank Volume at Sounding 3.20 M = 157.20 Cubic Meter, at Sounding 3.30 M = 163.60 Cubic Meter.

Calculation for bunker quantity:

– The Quantity in Metric Ton = Oil Vol x VCF x WCF,

– Observe Volume = {(3.27 – 3.20) / (3.30 – 3.20) x (163.60 – 157.20)} + 157.20

= (0.07/0.10) x (6.40) + 157.20 = 4.48 + 157.20 = 161.68 Cu.M.

– T 54B (VCF) > Density @ 15*C 0.9903 = 0.9870 (see the above picture you need to interpolate if any different numbers on both columns).

ASTM Table 54B – T 56 (WCF) : Density @15*C 0.9903 = 0.9892

(Quick formula with reducing factor for WCF is Density @ 15*C – 0.0011 = 0.9903 – 0.0011 = 0.9892).

We don’t need to see the table anymore.

– So, The Quantity in MT is 161.68 x 0.9870 x 0.9892 = 157.85 MT.

Sample calculation tanks sounding attached below (the Temp below should be 34 C).

Note : If you do calculation with Volume in Barrel,  just uses ASTM Table 6B for VCF, ASTM Table 11 for WCF in Long Ton and then ASTM Table 13 for WCF in Metric Ton.

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