Bunker survey calculation

1. HOW TO CONDUCT AND CALCULATE BUNKER SURVEY
How to Conduct BunkerSurvey
Home»BunkerSurvey»How to Conduct Bunker Survey
PostedBy Faisal Yusuf on Feb22, 2010 | 29 comments
What is Bunker Survey?The surveyis carried out to measure and ascertain the quantity of
Bunker on board at the specifictime.Thissurvey is producedthe report that statesthe amount of
bunker,usually Fuel Oil (FO) and Diesel Oil (DO), and sometimesLubricatingOil (LO) is included.
In this post limitsto how to conduct the Bunker Survey on the shiptanks only.
Survey Toolsrequiredfor Bunker Surveyor
– NotesBook,
– SoundingTape,
– Thermometer,
– DensityMeterfor Oil (0.750 -1.000),
– Oil and WaterPaste,
– PetroleumASTM Table 54B (forProduct Oil) and Table 56,
– Google and Glove,
– Flashlight,
– SamplingCan,
– Bottle or Can for Sampling(if requiredtakensamples).
Stepsfor ConductingBunker Survey
– Identifyand records the number and Depth of Tank, Reference Height,and Measuring
Methodrecommendedto use (Ullage or Sounding) for each Oil Tank. Soundingis determinedthe
level ofliquidtank from the bottom of the tank to the liquidsurface (typicallyappliedforlight
liquid).Ullage meansto determine the level ofliquidoftank by measuredthe empty
space from top of the Tank (the mouth of Sounding Pipe) to the liquidsurface (typicallyappliedfor
heavy liquid).The both methodswill point to the same result.
– Record the Last Bunker Report, Time and Place of last Bunker supplied,includesthe Oil
density.
– Records the quantity of bunker onboard whenthe ship arrivesat Port (arrival Condition) as
per Engine Log Book.

2. – Checkingthe accuracy of the SoundingTape, it is recommendedto use your own Sounding
Tape. In case we usedShip’sSoundingTape, please checkingthe tape.
– Soundingeach Oil Tank and recordsthe level ofOil on the tank. Attached the sounding Tape
with Oil Paste to make easy and clear to show of oil level (recommendedforLight Oil).
– Checkthe Ship’sDraft Marks to get the Ship Trim for Trim correction,and check the ship
Inclinationor Listing for List Correction,that is requiredto calculate the Tank Quantity Table.
– Taken Oil sample,check temperature and oil density,for the accessible tank only.The Service
and SettlingTanks are not accessible due to the oil on that tanks were inheating conditionat the
high temperature.We couldrecords the tank gauging for determiningthe quantity, the
temperature at the thermometeravailable on each tank, and the Oil Densityfrom the Engine Log
Book. If you could not taken the oil sample for checking density,itis recommendedto calculate the
DensityCommingle,by meansthe Combine DensitybetweentwoOils (Oldand NewOils) that has
mixedon one tanks which theyhave differentinDensity.Where it isapproaching the actual oil
density,the pattern is {(Old Oil Quantity x Oil Density/ Total Oil on Tank) + (NewOil Quantity x Oil
Density/ Total Oil on Tank)}.
– Calculations,thisstage will involvedthe Sounding level ofeach tank, Ship’sTrim and List,
Tank Quantity Table (providedbyShip’sChiefEngineer),Oil Densityand Temperature,ASTM Table
54B to ascertain the Volume CorrectionFactor (VCF – to convert from CubicMeter to Kiloliter) and
ASTM Table 54B for WeightCorrectionFactor (WCF – to convertfrom Kiloliterto Metric Ton).
– Example to calculate DensityCommingle:FO Tank No. 1 C, total oil on tank 400 Cu.M,Old Oil
200 Cu.Mwith density0.9870, and NewOil 200 Cu.M with density0.9720. DensityCommingle =
{(200 x 0.9870 / 400) + (200 x 0.9720 / 400)} = 0.4935 + 0.4860 = 0.9795.
– Issuedthe Tank Sounding and Bunker Report.
I think now you could conduct Bunker Survey,the Detail of Bunker Survey Calculation will be post
shortly. Let me know if I miss somethingby your commentsand feedbacks.
Regards,
Surveyors
Bunker Survey Calculation
In my last post How To Conduct Bunker Survey,I have explainedthe general step for Bunker Survey
conducts.Now, the topic is about the way to calculateshipbunker that we have found on the ship
tanks. It issuggestedto read the last post to become familiar with calculation.

3. Bunker Survey
The bunker calculation issimple andneedsthe following:
– Tank Sounding data and Tank Capacity Table.The CorrectedSounding meansbelowis the
soundingafter correcting with vessel’strim and list.
– Temperature of Oil on Tanks,
– Oil Density@15C,
– 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,CorrectedSounding = 3.27 Meter,Temperature = 34 degreescelcius,Density
@ 15 C = 0.9870.
Tank Volume at Sounding3.20 M = 157.20 Cubic Meter,at Sounding3.30 M = 163.60 Cubic Meter.
** Answer:
– The Quantity inMetric Ton = Oil Vol x VCFx 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@ 15C 0.9903 at 34 C = 0.9870 (see the picture belowyou needto
interpolate ifany differentnumbersonboth columns).

4. ASTM Table 54B
– T 56 (WCF) : Density@15C 0.9903 at 34 C = 0.9892 (Quick formula withreducing factor for WCF
is Density@ 15C – 0.0011 = 0.9903 – 0.0011 = 0.9892). We don’t needto see the table anymore.
– So, The Quantity in MT is161.68 x 0.9870 x 0.9892 = 157.85 MT. Sample calculationtanks
soundingattached below.
Tank Sounding
Note : If you do calculationwith Volume in Barrel, justuses ASTM Table 6B for VCF,ASTM Table 11
for WCFinLong Ton and thenASTM Table 13 for WCFin Metric Ton.
Just drop your comments around this topic.
Regards,
Surveyors

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20 Comments
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I have droppedbelowthe linkfordownloadof software formarine andcargo surveyorreferences.
1. ConvertFor WindowsbyJoshMadison(freeware)
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2. ASTM Table 54A by BorissGrahlovskis(freeware)
All calculationinprogrambasedonASTMTable 54A – GeneralizedCrude Oilsof Volume to15 C
againtsDensityat15 C.
Downloadavailableat http://deepblueseasoft.narod.ru/exe2008/Table54A.exe
3. ASTM Table 54B byBorissGrahlovskis(freeware)
All calculationinprogrambasedonASTMTable 54B – GeneralizedProductsCorrectionof Volume to
15 C againtsDensityat 15 C.
Downloadavailableat http://deepblueseasoft.narod.ru/exe2008/Table54B.exe
4. ASTM TablesProgramby Goldware (freeware)
APISpecificGravityandDensityConverter,WeightCorrectionFactor(WCF),GrossStandarVolume
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5. PetroleumCalculationsProgrambyDonaldR.Huckabee (freeware/shareware)
A petroleumcalculationProgram.Itisshareware andmaybe distributedfreely.Tableassociatedin
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6. Conversion,Gauging,Addictive andCalculator.
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6. 7s-DraftSurveyby SevenSurveyor(trial software) –Password: 123456
A Draft Survey calculationProgram.Foreasydraftsurveycalculationandsave yoursurveytime.For
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7. 7s-OilCal-T6.T54by SevenSurveyor(trial software) –Password:123456
A Petroleumcalculationprogram.For shipboardsurvey withcalculationandullage reportbasedon
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8. 7s-OilCal-T6BbySevenSurveyor(trial software)–Password: 123456
A Petroleumcalculationprogram.Forshipboardsurveywithcalculationandullage reportbasedon
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9. 7s-BunkerCal bySevenSurveyor(trial software) –Password: 123456
A BunkerTankSounding calculationprogram. Bunkersurvey calculationfortanksounding report
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