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.
14.2.3 Primary Method
14.1 Introduction
The most recent 20 voyages shall be used, or as many as are available, up to a maximum of 20.
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. 14.2 Primary and Alternate Methods “API MPMS Ch 17.9 / EI HM 49 – Vessel Experience Factor (VEF) 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.
The vessel shall maintain data to support the calculation of the VEF.
14.2.1 Measurement Data
a) Load (or discharge) date
All measurement data used must be based on globally recognized measurement standards for custody transfer purposes. Ship and shore calculations for each VEF line entry shall be based upon the same measurement standards. Cargo calculations and factors such as volume correction factors (Ctl), ROB/OBQ determinations, wedge calculations, and trim/list corrections should be consistent.
b) Voyage number
c) Port (or ports for a multiport voyage)
d) Cargo description
e) Vessel sailing TCV (or Vessel Arriving TCV)
f) OBQ TCV (or remaining on board TCV)
g) Vessel loaded (or vessel discharged)
14.2.2 Data Gathering
h) Shore load TCV (or shore discharge TCV): this quantity shall be on a consistent CTPL basis with vessel TCV quantities listed above
Data required for VEF calculation should be collected and recorded by the vessel or barge operator for every voyage. The data should be in a clear, understandable format. The vessel is responsible for maintaining separate logs for both load and discharge operations and for making these records available to the inspector. When vessel records are unavailable or incomplete, data may have to be compiled from other independent sources. Data that is not provided by the vessel or independent inspection companies can only be used if agreed to by the commercial parties.
i) Load B/L basis (or discharge basis)
Comments (as applicable)
j)
All voyages shall be listed in sequential order, with the most recent voyage first. The current voyage shall not be included. Any multi-port/multi-grade voyages shall be combined prior to adding to the list and a comment added to the worksheet to reflect this combination of ports into a single entry.
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