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These guidelines specify the policy and minimum recommended practices for the manual and automaticmeasurement,sampling,and accounting for bulk quantities of crude oil (including spiked, blended, andreconstituted crude oll), petroleum products, and chemicals that are transported on marine vessels. The activitiesdescribed in these guidelines include actions by producers, buyers, sellers, terminal operators, vessel wnersand their crews,customs authorities, independent inspectors, and other parties with an interest in measurements,
Certain vessel or terminal configurations and cargo characteristics, particularly chemicals, may require extensiveprocedures and calculation methods not covered in this chapter.
Cargo calculations should be performed independently by the responsible parties or by their authorizedrepresentatives, or both.The results of the quality determinations and quantity caiculations should be compared,and any differences resolved without delay. Each party involved in a custody transfer is responsible within theirdomain for contributing to a reconciliation of vessel and shore quantties and for seeking explanations for anydiscrepancies.
Any discrepancies relating to quality determination or calculated quantities, or both, should be recorded andreported to all interested parties. This procedure may be accomplished by issuance of a Letter of Protest (LOP)or Notice of Apparent Discrepancy.Every effort should be made to resolve discrepancies before the vesseldeparts.
The independent inspection report for the cargo custody transfer should be issued and distributed promptly.
These procedures are equally valid and applicable for either metric or customary units of measurement, providedthat the same types of units are used consistently.
The following referenced documents are indispensable for the application of this document. For dated references,only the edition cited applies. For undated references, the latest edition of the referenced document (includingany amendments) applies.
API.Manual of Petroleum Measurement Standards(MPMS) Chapter 3.1A, Standard Practice for the ManualGauging of Pefroleunm and Petroleun Products
API.MPMS Chapter 3.1B, Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanksby Automatic Tank Gauging
API.MPMS Chapter 4 (All sections),Proving SystemsAPI.MPMS Chapter 5(All sections), Metering
APl.MPMS Chapter 7(All sections).Temperature Deterrmination
API.MPMS Chapter 8.1, Standard Practice for Manual Sampling of Petroleum and Petroleum ProductsAPI.MPMS Chapter 8.2, Standard Practice for Automatic Sampling of Petroleum and Petroleum Products
API.MPMS Chapter 8.3，Standard Practice for Mixing and Handling of Liquid Samples of Petroleum andPetroleum Products
API.MPMS Chapter 8.4,Standard Practice for Sampling and Handling of Fuels for Volatility Measurement
API.MPMS Chapter 12.1.1，Calculation of Static Petroleum Quantities, Part 1—Upright Cylindrical Tanks andMarine vessels
API.MPMS Chapter 12.2，Calculation of Petroleum Quantities Using Dynamic Measurement Methods andvolumetric Correction Factors
API.MPMS Chapter 12.2.4，Calculation of Petroleum Quantities Using Dynamic Measurement Methods andVolumetric Correction Factors, Part 4—Calculation of Base Prover Volumes by Waterdraw Method
API.MPMS Chapter 12.2.5,Calculation of Petroleum Quantities Using Dynamic Measurement Methods andVolumetric Correction Factors, Part 5—Calculation of Base Prover Volumes by Master Meter Method
AP1.MPMS Chapter 17.2,Measurement of Cargoes On Board Tank Vessels
API.MPMs Chapter 17.11/EIHM 52,’Measurement and Sampling of Cargoes On Board Tank Vessels UsingClosed and Restricted Equipment
API.MPMS Chapter 17.12/EIlHM 51,Procedure for Bulk Liquid Chemical Cargo Inspections3Terms and Definitions
For the purposes of this document, the following definitions apply.Terms of more general use may be found inthe APl MPMs Chapter 1,Oniine Terms and Definitions Database.
A means used by the petroleum industry to express the density of petroleum liquids. API gravity is measured bya hydrometer instrument having a scale graduated in degrees APl.The relation between APl gravity and relativedensity (formerly called specific gravity) is as follows:
API Gravity at 60F=141.5/(Relative Density 60 °F/60°F)-131.53.2
automatic sample probe
A sample probe with an integrated sample extractor mechanism that is inserted into the flowing stream andwhich, upon a signal from the controller device, which is monitoring a flow measuring device, is used to extracta representative sample from the fluid flowing in the pipe.
Water taken onboard when a vessel is empty or partly loadedldischarged to increase drart to properly submergethe propeller and maintain stability and trim.
Cargo Quantity Option Certificate
A certificate signed by vessel and shore representatives acknowedging the amount of cargo intended to load.Generally, most product cargoes have a tolerance based on either supplier, receiver, or vessel capabilities.Eachparty involved with the loading shall agree to the quantity to be loaded.
The liquid film that adheres to the inside surface of a container after it has been emptied.