Bunker Survey Calculation



marine cargo ship surveyors

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.

Table 54B

** 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).
Marine and Cargo Surveyors Webblog

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



Author: Faisal Yusuf

Hi, my name is Faisal Yusuf, but you can call me Surveyor. I live in Jakarta, Indonesia and work as a surveyor.

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109 Comments

  1. Dear Sadanand,

    I need soft copy of this ASTM table . Could you please send me this ASTM54B Table softcopy. Plz…in the image above I couldn’t see any values. I need this table very urgent. Plz send me soon. It’s request from me.

  2. good calculation

  3. 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

  4. Dear sir,

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

    Thank you
    indran

  5. 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

  6. Daer Abu,

    Thanks for your reading and comment.

  7. THANKS FOR THIS INFORMATIONS

  8. 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

  9. Dear Sadanand,

    Good day
    Way of simple explanation and a wonderful

    Regards,
    Aly Hussein

  10. 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

  11. Dear all,

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

    Regards,

    Sadanand

  12. Thanks Sadanand,

    Hope could find more interesting topic on the next post.

    Regards,
    Faisal

  13. 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

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