Download - MART 406 Cargo Measurement
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Types of TankersTypes of TankersCrude OilCrude Oil
OBOOBOProductsProducts
ChemicalsChemicals
Specialty CargosSpecialty Cargos
LPG/LNGLPG/LNG
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Types of Crude TankersTypes of Crude Tankers
ULCCULCC > 300,000 dwt> 300,000 dwt
VLCCVLCC >160,000 dwt>160,000 dwt
SUEZMAX Largest vessel that will passSUEZMAX Largest vessel that will pass
through the Suez Canal Loaded. Holdsthrough the Suez Canal Loaded. Holdsabout 1 million bbls.about 1 million bbls.
AframaxAframax-- Associated freight rate tariff.Associated freight rate tariff.About 80,000 dwt 500,000 bbls.About 80,000 dwt 500,000 bbls.
PanamaxPanamax-- 105 foot beam, largest size that105 foot beam, largest size thatwill pass through Panama Canal. (notwill pass through Panama Canal. (notnecessarily a crude carrier.)necessarily a crude carrier.)
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Hull TypesHull Types
Type I, II, IIIType I, II, III
Protective BallastProtective Ballast
Double SidesDouble Sides Double BottomDouble Bottom
Double HullDouble Hull
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Cargo MeasurementCargo Measurement
UllageUllage-- Distance from a referenceDistance from a referencepoint on deck to the top of the liquid.point on deck to the top of the liquid.
InnageInnage-- Distance from Bottom ofDistance from Bottom ofTank to top of Liquid.Tank to top of Liquid.
Gross BarrelsGross Barrels-- The Volume containedThe Volume containedin a tank that is not corrected forin a tank that is not corrected fortemperature.temperature.
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Survey TermsSurvey Terms
ROBROB-- Remain on BoardRemain on Board
OBQOBQ-- On Board QuantityOn Board Quantity
WedgeWedge-- Area of liquid at the back of aArea of liquid at the back of atank that is nearly empty. There is an APItank that is nearly empty. There is an APIFormula to Calculate this amount ofFormula to Calculate this amount ofLiquid.Liquid.
BS&WBS&W-- Bottom Sediment and Water, ThisBottom Sediment and Water, Thisapplies to Crude Oil and is subtracted fromapplies to Crude Oil and is subtracted fromthe GSV to obtain NSV.the GSV to obtain NSV.
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Metritape Tank GaugeMetritape Tank Gauge
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GaugingGauging
Open Gauging (on deck)Open Gauging (on deck)
Floating Tapes (on deck)Floating Tapes (on deck)
Electrical Resistance (remotely read)Electrical Resistance (remotely read) MMC (on deck)MMC (on deck)
Hermetic (on deck)Hermetic (on deck)
Saab Radar System (remotely read)Saab Radar System (remotely read)
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Cargo MeasurementCargo Measurement
1 barrel is 42 gallons1 barrel is 42 gallons
1 cubic meter is 6.2898 barrels1 cubic meter is 6.2898 barrels
UllagesUllages are taken and corrected for list &are taken and corrected for list &trim to determinetrim to determine Gross BarrelsGross Barrels in a tankin a tank
Temperatures and api Gravity are thenTemperatures and api Gravity are then
used to determine aused to determine a VolumeVolume
Correction FactorCorrection Factorto correct theto correct theGross Barrels to Net Barrels at 60Gross Barrels to Net Barrels at 60degrees F.degrees F.
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APIProcedures for TemperaturesAPIProcedures for Temperatures
Temperatures must be taken at 3Temperatures must be taken at 3levels in each tank that is full. Upper,levels in each tank that is full. Upper,M
iddle, Lower.M
iddle, Lower. Slack Tanks that are less than full,Slack Tanks that are less than full,
one temperature at the midpoint ofone temperature at the midpoint ofthe cargo is sufficient.the cargo is sufficient.
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Volume Correction FactorVolume Correction Factor
VCF for Crude Oils is API Table 6AVCF for Crude Oils is API Table 6A
VCF for Products is API Table 6BVCF for Products is API Table 6B
VCF for NLS such as MTBE is APIVCF for NLS such as MTBE is APITable 6CTable 6C
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Volume Correction FactorVolume Correction Factor
Note that other tables exist such asNote that other tables exist such as54B which use VCFs based on 1554B which use VCFs based on 15degrees centigrade.degrees centigrade.
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Cargo TransfersCargo Transfers
The safe transfer of dangerous liquids betweenThe safe transfer of dangerous liquids between
vessels and terminals requires that the safety ofvessels and terminals requires that the safety of
personnel, environment and equipmentpersonnel, environment and equipmentbebe
foremost in everyone's mind.foremost in everyone's mind.
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Information on CargosInformation on Cargos
International Maritime Dangerous GoodsInternational Maritime Dangerous Goods
(IMDG) Code (IMO)(IMDG) Code (IMO)
Chemical Hazards ResponseInformationChemical Hazards Response
Information
System (CHRIS)System (CHRIS)
Chemical Data Guide, CG 388 (US CoastChemical Data Guide, CG 388 (US Coast
Guard)Guard)
Material Safety Data Sheets (MSDS)Material Safety Data Sheets (MSDS)
Manufactures/Distributors (CDI)Manufactures/Distributors (CDI)
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Determining Tonnages of CargoDetermining Tonnages of Cargo
Net Barrels at 60 degrees F areNet Barrels at 60 degrees F aremultiplied by the Long Tons permultiplied by the Long Tons perBarrel for that api Gravity. This isBarrel for that api Gravity. This isContained in API Table 11.Contained in API Table 11.
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Stability CalculationsStability Calculations
Tonnages are then used toTonnages are then used todetermine stability calculations fordetermine stability calculations forthe vessel.the vessel.