Posted By Faisal Yusuf on Mar 27, 2010 |

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.

** Question :

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.

** Answer :

– 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*.

For the above calculation, you could download the software BunkerCal by follow this link http://www.sevensurveyor.com/software/bunker-calculation/

Just drop your comments around this topic.

Regards,

Surveyors

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