mart 406 cargo measurement

8/2/2019 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.

mart 406 cargo measurement

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