familiarizacion con buques tanque
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Ship measurements(Mediciones marinas)
Tanker familiarization(Familiarizacion con Buque Tanque)
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Conventional tanker : Skin-tank ships incorporating twinlongitudinal bulkheads.
P C S
Segregated
bal last tanks
Cargo
tanks
Crude Oil Carriers
Ship - Tanker familiarization
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Double-Skin ships : Have segregated ballast tanks surroundingthe cargo tanks.
P C S
Crude Oil Carriers
Ship - Tanker familiarization
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Forward perpendicular ( FP ) : This is represented by a line which is perpendicular to the intersection of the designed load water-line with the forward side of the stem.
After perpendicular ( AP ) : This is represented by a line which is perpendicular to the intersection of theafter edge of the rudder-post with the designed load water-line.
Length between perpendiculars ( LBP ) : This is the horizontal distance between the forward and theafter perpendiculars.
Length overall ( LOA ) : This is the length measured from the extreme point forward to the extreme point aft.
A.P. F.P.Mid ship
ForeAft
Lbp
Loa
Definitions
Ship - Ship measurement
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Trim : This is the difference between the draughts forwardand aft.If the draught forward is greater than the draught aft it iscalled trim by head, or bow.If the draught aft is greater, it is called trim by the stern.
HeadStemstern
Trim by stern
Fore draughtAft draught
DefinitionsShip - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Moulded Breadth ( B ) : This is the maximum breadth of the ship measured inside the inner shell, andusually occurs amidships. Moulded base line : This represents the lowest extremity of the moulded surface of the ship. At the
point where this line cuts the midships section a horizontal line is drawn, and it is this line which actsas the datum, or base line for all hydrostatic calculations.
Moulded Depth ( D ) : This is the vertical distance of the ship measured inside the inner shell, andusually occurs amidships.
Moulded Draught : This is the draft measured to any water-line, either forward or aft, using the moulded base line as a datum.
Mouldeddraught M
o u l d e d
d e p t
h
Moulded breadth S.W.L.
Ship - Ship measurementsDefinitions
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Heel ( List ) : This is the amount of inclination of the ship in thetransverse direction, and is usually measured in degrees.
S.W.L.
Starboarddraught
Portdraught0
Clinometer
Vessel is listed to the port s ide
Definitions
Ship - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Line serves port cargo tanks. Line serves Starboard cargo tanks. Line serves centre cargo tanks.
Segregated ballast line.
Top line
Bottom line
Pumproomraiser Drop
line
Piping arrangementShip - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Liquid Metering : Ship tanks to be filled with a convenient liquid (e.g. water) throughan accurately calibrated reference meter, and ullage compared with recorded volumethroughout the operation. (normal accuracy +/- 0.05 % )
Advantage : Produce a very accurate set of ship tank calibrations. Disadvantages:
Time consuming therefore expensive. List and trim corrections cannot be calculated from the basic data. Problems with constantly changing trim and list when the ship is afloat.
Internal measurement : Ship tanks to be entered and a large number of internaldimensions of width, length and height measured, together with the size and position of all internal displacements. (normal accuracy +/- 0.25 % )
Advantages : Reasonably accurate. Less time consuming than metering. List and trim corrections can be calculated from the basic data.
Disadvantages: Difficulty in measuring foremost tanks ( 1 wing ) as they are tapering
towards the bottom and the forward end.
Ship Tanks Calibration
Ship - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Shipyard : The calibration tables are based on the plans and drawings fromwhich the ship was fabricated. (Themost common calibration method usedfor Crude oil carrier )
Advantage:
Supplied with the ship. Disadvantages :
Actual location of deadwoodis not determined. Theobstructions volumes areadded together and averageout the total displacementover the entire tank depth.
The exact position of the bulkheads not measured.
Bulkhead and hull distortionnot accounted for.
Variation in total heights notdetected.
Actual deadwood displacement
Assumed deadwood displacement
Tank Cross -section
Ship Tanks Calibration
Ship - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Bottom sediment : Non-hydrocarbon solids present in a tank as a separate layer at the bottom (non free flowing material e.g. sand, rust particles) .
Sludge : Hydrocarbon waxes present in a tank and may contain water/oil emulsions andsediment.
On board quantity ( OBQ ) : All the oil, water, sludge and sediment in the cargo tank s andassociated lines and pumps on a ship before loading a cargo commences.
Remaining on board (ROB ) : All the oil, water, sludge and sediment in the cargo tank s andassociated lines and pumps on a ship after discharging a cargo.
Slops : Material collected after such operations as stripping, tank washing or dirty ballast
separation. It may include oil, water, sediment and emulsions. Clingage : Oil residues which adhere to the surface of tank walls and structures on
Completion of discharge.
Definitions
Ship - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Your safety is your own responsibility. Wear the required safety protective clothing. Obey all terminal safety/ Vessel rules.
Ensure all pressure in the tank has been released beforegauging/ sampling. Ensure all Loading and vapor movements has ceased
before gauging / sampling . Stand to the upwind side of the gauge hatch while
gauging or sampling
Safety precautions
Ship - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Ship measurements
Determining OBQ and ROB
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
All ballast and bunker tanksto checked.
All vessel lines, pumps must
be drained. Overboard discharge valve
and sea valves must be closedand sealed.
Obtain slop information ( If exist ).
All cargo tanks to be checked. Measure the OBQ from the
Aft position of the tank (if possible).
Before Loading
Ship - Ship measurements API - Chapter 17 Section 2
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Measured quantity is liquid .
If S =< ( L - U ) X F
Apply wedge formula S' = [(U - DF)X F] + S Wedge formula
Note : The formula assumes that the
liquid is free flowing. It only applies for zero list. Units used must be consistent.
Trim factor ( F ) =T
Lbp
S' X B2
2 X FVolume =
U
T
Lbp
U : Aft bulk distanceS : SoundingL : Tank lengthB : Tank breadthD : Tank depth
S LS'
D
Fore
Determining OBQ/ROB Quantity
Ship - Ship measurements API - Chapter 17 Section 4
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Fore
MeasuredUllage
Trim correctedullage
U
T
Lbp
Level measurement
Trim correction
If the ullage hatch is located
In the middle of the tank No Trim correction
In the aft of the tank
Trim correction = (+) In the fore of the tank
Trim correction = (-)
Ship - Ship measurements API - Chapter 17 Section 4
Determining OBQ/ROB Quantity
U = Aft bulk distanceT = TrimLbp = Length between perpendicular
Measured quantity is liquid, But wedge not applicable .
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Measure the sounding ( S ). Check the sounding from more
than one location ( if possible ). Measured sounding assumed to be
uniform all over the tank. Enter the calibration table and get
the volume corresponds to this
sounding with trim =0.
Fore
S
Measured quantity is Non-liquid.
Ship - Ship measurements API - Chapter 17 Section 4
Determining OBQ/ROB Quantity
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Measuring Slop tank
Measure Oil level and theoil/water interface level inthe slop tank(s), preferablyusing a UTI.
Measure the temperature of the oily layer.
Obtain the density, correctthe oil volume .
Fore
Oil Ullage Oil/water interface
(X) Temp Oil Layer
Free Water
Ship - Ship measurements API - Chapter 17 Section 4
Determining OBQ/ROB Quantity
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Level measurement(Mediciones de Tanques)
Ship measurements
U l l a
g e
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Ship
Measurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Before measuring the ullage : Get the official measuring point
from calibration table. Get the ship's draughts; i.e.. trim
and list. Make sure that lines are drained
into cargo tanks. Check the measuring equipments.
Level measurement using Steel tape:
Only applicable for open-systemships.
Check the bob and the steel tapecompatibility
Check the ullage. It is better to get the cut on the tape. If there is swell take more than one
ullage and get the average.
U l l a g e
Level measurement
Ship - Ship measurements API - Chapter 17 Section 2
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Level measurement usingSonic tape :
Applicable for closed-system ships.
If used for open-systemships UTI must beearthed.
Make sure that HC instated in calibrationtable, or attachedcertificate.
Check the ullage. If there is swell take
more than one ullageand get the average.
Level measurement
Ship - Ship measurements API - Chapter 17 Section 2
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Fore
MeasuredUllage
Trim correctedullage
U
T
Lbp
Level measurementLevel measurement
Trim correctionIf the ullage hatch is located :
In the middle of the tank
No Trim correction In the aft of the tank
Trim correction = (+) In the fore of the tank
Trim correction = (-)
U = Aft bulk distanceT = TrimLbp = Length between perpendicular
Ship - Ship measurements API - Chapter 17 Section 2
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Fore
MeasuredUllage
Trim correctedullage
U
T
Lbp
Level measurementLevel measurement
Ship - Ship measurements API - Chapter 17 Section 2
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Temperature measurement
Ship measurements(Mediciones marinas)
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Thermometer must be checked against certified thermometer before use.
Three levels temperature to be measured at 1/6, 1/2 and 5/6
of the oil depth for each cargo tank. If there is cargo stratification in the tank more temperature
measurement is preferred.
Average Temperature = TemperatureNo of temperatures
Temperature measurement
Ship - Ship measurements API Chapter 7
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Temperature Profile for a cargo tank.
75 80 85 90 95 100 105 110
Temp oF
0
5
10
15
20
25
S o u n
d i n g
This exercise was carried out on a vessel at Dis-port for wing tank loadedwith AHC.40 temperatures measurements were used to plot this curve.
Temperature measurementShip - Ship measurements
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Vessel experience factor : Is a compilation of the history of theTCV vessel measurements, adjusted for OBQ or ROB,compared with the TCV shore measurements. Separate VEFsshould be developed for both the load and discharge operations.
Information used to calculate a VEF should be based onDOCUMENTS that follow accepted industry standards and
practices, such as inspection company reports.
Ship Vessel experience factor API Chapter 17 Section 1 Appendix C
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Do not use weight or mass, but use Cubic meters or barrels for all voyages . Use compatible ASTM tables for Ship / Shore figures. Excluded the following voyages :
All voyages prior to any modification which affected the vessel's cargocapacity.
All voyages where shore measurements were not available or basedsolely on shipboard measurement.
Part cargo. Ship to ship transfer.
List the available data in chronological order. Calculate individual LVR for each voyage. Calculate an average TCV ratio. Delete any voyage whose LVR does not lie within +/- 0.0003 of the average
TCV ratio. Add all remaining vessel TCVs together and all remaining Shore TCVs. Calculate the load VEF
Ship Vessel experience factor API Chapter 17 Section 1 Appendix C
Calculation procedure
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Voy No CargoGrade Loadport Date ShipTCV ShipOBQ ShipTRV ShoreTCV VCF Tbl. V.L.R. QU.
39 A L C Yanbu 06.04.96 952356 1260 951096 949546 6 1.00163 Y
38 Sarir M.Elhar 04.02.96 1045143 873 1044270 1042321 6 A 1.00187 Y
36 A L C S.Kerir 01.01.96 923396 1469 921927 919485 6 A 1.00266 Y
32 Forozan S.Kerir 02.10.95 1004501 1808 1002693 1002500 6 A 1.00019 Y
30 Es Sider Es Sider 30.07.95 948024 562 947462 944433 6 A 1.00321 Y
28 I R H S.Kerir 22.06.95 945724 262 945462 940235 6 A 1.00556 N
27 A L C S.Kerir 07.06.95 905373 546 904827 903694 6 A 1.00125 Y
25 Zeit Bay S.Kerir 05.04.95 1010790 333 1010457 1009126 6 A 1.00132 Y
24 AM/ALC S.Kerir 04.03.95 1007911 1101 1006810 1004147 6 A 1.00265 Y
23 IRL/IRH S.Kerir 01.02.95 986310 187 986123 984130 6 A 1.00203 Y
21 G S M S.Kerir 07.12.94 961199 348 960851 957782 6 A 1.0032 Y
20 A M C R.Tanura 11.11.94 991069 668 990401 987395 6 1.00304 Y
TOTAL 11672379 11644794
Average TCV ratio 1.00237Upper Limit =1.00537Lower Limit = 0.99937
Vessel Experience Factor =1072691710704559 = 1.0021
Ship Vessel experience factor API Chapter 17 Section 1 Appendix C
Calculation procedure
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Sampling
Ship measurements(Mediciones marinas)
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
Draw a sample from each cargo tank. Draw a free water samples (if possible). Ship composite sample must be prepared in the laboratory. Individual samples must be blended in proportion to the
tank volume each sample represents.
Manual Sampling
Ship SamplingAPI Chapter 8 Section 1
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
BUREAU VERITAS DEL PERU S.A. - CAPACITACIN
The sampler is located at thecustody transfer point.
The cargo received/delivered isdivided to parcels, each parcel
passes through a ship'smanifold. If one of the two unitused is O/O/S, about half thecargo is sampled.
This portable samplers usually
pneumatically operated. Flow is measured by the mean
of differential pressure actingupon the annubar.
Ship-board in-line Sampler
Ship Sampling API Chapter 8 Section 2
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ShipMeasurement
DeterminingOBQ/ROB Quantity
LevelMeasurements
TemperatureMeasurement
Vessel ExperienceFactor VEF
Sampling CargoTanks
Ship-board samplers
Ship Sampling API Chapter 8 Section 2
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