it. Indicate single/double valve separations, if any, between clean/dirty ballast and cargo systems.
• Request to see raw data to support information on the voyage log.
3.1 Before Transfer This section considers the steps on a loading operation.
• Record the date of last dry-dock and whether measurement equipment was modified.
3.1.4 Vessel Lines and Tanks
Inspect for the presence of cargo in void spaces, ballast tanks, cofferdams, and non-designated cargo compartments. Before measuring On Board Quantity (OBQ), the condition of the vessel’s lines should be determined. The inspector may request that the vessel lines be drained, and the valves opened. Caution should be exercised on multigrade cargoes to avoid commingling the line contents of different products. Measure the amount of cargo or ballast water drained into the tank and sample, if possible. Record the capacity of the lines that were drained. Report the transfer of any engine room slops or other liquid into the cargo or slop tanks. If the previous cargo poses a contamination problem, all lines and pumps should be cleaned thoroughly and drained. Note how cleaning and draining was accomplished. When the vessel is inspected for tank acceptability prior to loading, tank inspection should be performed in accordance with “API MPMS Chapter 17.8 - Guidelines for Pre-loading Inspection of Marine Vessel Cargo Tanks and Their Cargo- handling Systems”.
3.1.1 Vessel Experience Factor (VEF)
Where issues such as these cannot be adequately explained by the vessel’s officer -in charge/operator, appropriate notations should be made on the VEF report and a Letter of Protest (LOP) issued to the vessel.
Data on previous voyages must be obtained from the vessel for use in calculating the vessel experience factor - See “API MPMS Chapter 17.9 / EI HM 49 - Vessel Experience Factor (VEF)”. It is important not to simply take all the VEF information supplied by the vessel at face value. The data should be reviewed to indicate possible inconsistencies. For example, some points that that should be raised with the vessel’s officer -in-charge are (but not limited to) the following. • Why is there is a missing voyage on the voyage log (e.g., Voyage 17-05)? • What was the vessel doing for the approximate 11-week period between Voyages 17-17 and 18- 01? • Are consistent units of measure used throughout the form? • Verify voyage entries where vessel and shore TCV are the same, although possible is most likely vessel figures were used for Bill of Lading purposes.
3.1.2 Draft, Trim, & List
Record the draft, trim, and list. These should be physically observed at the time of intervention. Both trim and list can significantly affect the liquid level of the product stored within the vessel tanks; therefore, this is an important part of the Inspection survey.
3.1.3 Remaining Ballast
For most cargoes, there should be no ballast remaining in the cargo tanks, lines, or pumps. Any ballast on board should be totally segregated. Measure and record the quantity of any ballast left on board prior to loading. Record the presence of and sample any measurable petroleum in ballast tanks. The vessel should not be gauged during de- ballasting. If simultaneous de-ballasting is performed during loading operations, determine the reason from the vessel’s representative and record
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