API MPMS 17.9 2019 pdf free download

API MPMS 17.9 2019 pdf free download.Manual of Petroleum Measurement Standards Chapter 17.9 Vessel Experience Factor (VEF) El Hydrocarbon Management HM 49.
3.8 qualifying voyages Voyages whose VLR or VDR are within the ±0.30 % of the mean vessel/shore ratio. 3.9 rejected voyage A voyage that is eliminated due to the unsuitability of its cargo quantity determination such as, but not limited to: gross error, ship-to-ship transfer, etc. 3.10 remaining on board ROB Refers to material remaining in a vessel’s cargo tanks, void spaces, and/or pipelines after the cargo is discharged. ROB includes any combination of water, oil, slops, oil residue, oil water emulsions, sludge, and sediment. 3.11 total calculated volume TCV The total volume of all petroleum liquids and sediment and water, corrected by the appropriate volume correction factor (Ctl) for the observed temperature and API gravity, relative density, or density to a standard temperature such as 60 °F or 15 °C and also corrected by the applicable pressure correction factor (Cpl) and meter factor, plus all free water measured at observed temperature and pressure (gross standard volume plus free water). 3.12 trim The condition of a vessel in terms of its longitudinal position in the water: trim is the difference between the forward draft and the aft draft and is expressed by the head or by the stern to indicate the end of the vessel that is deeper in the water. 3.13 trim correction The correction applied to the volumes or gauge observed in a vessel’s tank when the vessel is out of trim, provided that the liquid is in contact with all bulkheads in the tank. 3.14 vessel discharge ratio VDR The total calculated volume (TCV) by vessel measurement on arrival, less the ROB, divided by the TCV by shore measurement at discharge [VDR = (TCV arrival volume – ROB)/TCV received on shore at discharge]. 3.15 vessel experience factor VEF A compilation of the history of the total calculated volume (TCV) vessel measurements, adjusted for OBQ or ROB, to the TCV shore measurements. Separate VEFs shall be developed for both load and discharge terminals.
3.17 voyage number An administrative number that may include one or many port calls with multiple load and/or discharge operations. NOTE For the purpose of this standard, voyage numbering/designations are defined by the vessel and for simplicity referred to as “voyage” throughout this standard. Barges and barge companies typically do not issue voyage numbers. 3.18 gross error voyage Voyages where the VLR or VDR is less than 0.98000 or greater than 1.02000. 3.19 VEF voyage A waterborne passage consisting of one or more cargoes carried from and to one or more load and discharge ports. 4 Rationale and Data 4.1 VEF Rationale The VEF is a loss control tool that can help determine whether differences measured between the vessel and the shore are typical. The VEF may then provide a reliable means for review of quantities loaded or discharged and provide meaningful cargo reconciliation. As a result of differences between load and discharge operations, the load and discharge VEFs will not typically have the same values and therefore the load and discharge data shall be maintained separately. When agreed by interested parties, Bill of Lading or outturn quantities may be determined based on vessel received or delivered quantities adjusted by the VEF. In the event of a dispute regarding the application of a VEF, resolution shall be made by the commercial parties involved. 4.2 Primary and Alternate Methods This standard provides a primary method for calculating a VEF. The primary method uses ±0.30 % of the mean vessel/shore ratio for outlier rejection and is the ratio of the sum of all qualifying voyages. See Annex A. If the primary method does not produce a VEF, then the alternate method should be used. The alternate method provides a statistical outlier rejection technique and uses an average of qualifying ratios. See Annex F.