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If the visual inspection proves
unsatisfactory, the discharge should be suspended and an investigation
conducted. In the case of products with no obvious signs to
observe, prompt laboratory testing for agreed specifications may be
required. In any case, these samples should be taken and
retained.
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Meter
Proving
-
Discharge Pressure
Log the discharge pressure and
flow rate on the Vessel Discharge Record. Indicate the place
where the vessel's line discharge pressure was measured.
- Time
Log
Report on a Time Log, the time
and date of the main discharge events. Include the time and
description of any unusual occurrences in the proper column of the Time
Log.
Vessel
Inspection - After Discharge
- Draft,
Trim and List
Record the draft, trim and list
on the On-Board Quantity / Remaining On Board Report.
- Vessel
Lines
Before measuring the remaining
on board (ROB) volume, request that the vessel lines be drained into
cargo tanks after discharging, if possible. An empty or slack
tank generally is used for this purpose. These tanks should
be located towards the aft of the vessel if the vessel is trimmed by
the stern. Caution should be exercised on multi-grade cargoes
in order to avoid commingling the line contents of different
products. Record their capacity and into which tank the lines
were drained. All internal transfer of cargo should be
completed and all tank valves should be secured prior to
gauging. Discharge lines should be vented prior to gauging.
- Remaining On-Board Measurement
After discharge lines and deck
lines have been drained, determine the amount and nature of any
material remaining on board. Include in-transit cargo that
was not discharged, non-load-on-top volumes and material in
non-designated cargo spaces. Describe material found in the
bottom of tanks as liquid cargo, non-liquid cargo, sediment / sludge or
free-water. If inspection, measurement and bottom sampling
reveals that any cargo remains on board, concerned parties should
determine whether further attempts should be made to pump the remaining
quantities ashore. If this is not done, report the
reasons. Such reporting is particularly important whenever a
cargo retention clause is included in the charter party
agreement. A Letter of Protest should be issued if applicable.
- Remaining On-Board Volume Calculations - See
Load Port Information ( substitute Load with Discharge
and OBQ with ROB )
All non-load-on-top
compartments from the load port should be measured to determine whether
any volumes are changed. These measurements should be
reported on the On-Board Quantity / Remaining On-Board Report and
should not be included in the ROB determination. If there is
a change in these volumes, ascertain the reason and, if necessary,
notify all interested parties immediately.
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Remaining On-Board Sampling
If a sufficient quantity of
petroleum and/of free water is found and if a disagreement exists about
its identity and nature, take a sample of each. Obtain a
composite sample of all in-transit cargo quantities that remain on the
vessel, if possible. Seal the samples and retain
them. Disposition of retained samples is to be specified by
the interested parties.
Sections of text taken from API - MPMS Chapter 17 Marine Measurement
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