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

*Related*

July 24, 2010

good calculation

July 7, 2010

Dear Indran,

I have published two posts about bunker survey, you could re-read http://sevensurveyor.com/2010/02/22/how-to-conduct-bunker-survey/ and http://sevensurveyor.com/2010/03/27/bunker-survey-calculation/.

Then you could download at downloading sidebar on my website the “Bunker survey guide.pdf” and “MEASUREMENT OF PETROLEUM ON BOARD MARINE VESSELS.pdf”.

The four resources is good enough to guide you for conducting bunker survey.

If you are serious, you could learn by joining the survey company in your country as well.

Regards,

Surveyors

July 7, 2010

Hi Aly,

I have ever answers the same comment as you had. Kindly check one of the comment at post Draft Survey Procedures and Calculation >> http://sevensurveyor.com/2009/08/25/draft-survey-procedures-and-calculation

Regards,

Surveyors

July 2, 2010

Dear sir,

I just starting to learn how to conduct bunker surveying , give some info from where i start.

Thank you

indran

June 17, 2010

Dear Surveyor,

thank you indeed for Your contribution on this site,kindly pls explain, how I can calculate the Trim & List correction of sounding, in case there are no Trim & List correction tables are available on board.

best regards

Aly Hussein

May 30, 2010

Daer Abu,

Thanks for your reading and comment.

May 17, 2010

THANKS FOR THIS INFORMATIONS

May 12, 2010

Dear Sadanand

Could you please explain, how you find out the Trim correction & List correction for sounding, in case there are no Trim & List correction tables are available on board.

yours faithfully

Aly Hussein

May 12, 2010

Dear Sadanand,

Good day

Way of simple explanation and a wonderful

Regards,

Aly Hussein

May 1, 2010

Sadanad,

Briefly, I can afford you with the calculation you meant. For the complete one, may be post later.

Example with Capacity Table :

Fuel Tank No. 1C.

Sounding : 1.50 M or 1,500 MM.

Vessel’s Trim : 1.00 M.

Vessel List : 1.0 degree to Starboard Side.

Trim Correction for Tank No. 1C in MM

——————————– TRIM ——————————–

SOUNDING …… -1.00 / 0.00 / 1.00 / 2.00 / …

…. 1.00 …………… -200 / 000 / 200 / 400 / …

…. 2.00 …………… -600 / 000 / 400 / 600 / …

…. 3.00 …………… -600 / 000 / 600 / 800 / …

List Correction for Tank No. 1C in MM

——————————— PORT / STARBOARD ————

LIST ….. / 3.0 / 2.0 / 1.0 / 0.0 / 1.0 / 2.0 / 3.0 / …

Corr …… 300 / 200 / 100 / 000 / -100 / -200 / -300 /

From the both tables we could get the corrected sounding as below :

Corrected Sounding (CS) = Sounding (S) + Trim Correction (TC) + List Correction (LC)

TC at S 1.50 M and Trim at 1.00 M is 300 MM (by Interpolation)

LC at List 1.0 degree to starboard (the right part beside 0.0 degree) is -100 MM.

CS = S + TC + LC.

CS = 1500 + 300 +(-100) = 1,800 – 100 = 1,700 MM or 1.70 M.

That’s all..

Surveyors

April 27, 2010

Dear all,

Please explain the specimen of calculation to find out the corrected sounding corrected with trim and list.

Regards,

Sadanand

April 14, 2010

Thanks Sadanand,

Hope could find more interesting topic on the next post.

Regards,

Faisal

April 13, 2010

Dear Surveyor,

The above post is excellent and gives a detailed survey procedure.

Your contribution to this site is phenomenal.

Thanks a lot.

Best Regards,

Sadanand