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In operations involving
lightering, each receiving vessel as well as the delivering vessel
should be gauged prior to and upon completion of lightering.
- -
Water
Cut Measurement - See Load Port Information (
substitute Load with Discharge )
- -
Vessel
Temperature - See Load Port Information (
substitute Load with Discharge )
- - Ballast Tanks - See
Load Port Information ( substitute Load with Discharge )
Use
the Vessel Ullage / Sounding and Capacity Report to record any seepage
into or from cargo and ballast tanks
- -
Vessel
Sampling - See Load Port Information (
substitute Load with Discharge )
- -
Sample
Handling - See Load Port Information (
substitute Load with Discharge )
- Sea
Valves
Confirm in the presence of the
vessel's personnel that sea valves and overboard discharge valves are
in the closed position. Ensure that those valves sealed at
the loading port remain closed and sealed until the unloading operation
is completed. Record and report the seal numbers on the
Vessel Ullage / Sounding and Capacity Report. If these
numbers differ from those recorded at the load port, ascertain the
reason for the discrepancy and notify all concerned parties.
- -
Bunker
Inspection - See Load Port Information (
substitute Load with Discharge )
- - Volume Calculations
Use the Vessel Ullage/Sounding
and Capacity Report or a similar form to make volume calculations on
arrival. Show on the Vessel Ullage/Sounding and Capacity
Report both the actual ullage as measured and the ullage corrected for
trim and list. Calculate the gross standard volume for each
tank, using the average temperature for each tank and the API gravity
used at the load port. Do not use an average temperature for
the entire vessel. The Vessel Ullage/Sounding and Capacity
Report must also include the measurement and quantity of free water,
the gross observed volume and the temperature for each compartment of
the vessel. Obtain and copy the vessel's sailing ullage form
that was prepared at loading and included it in the inspection
report. Determine the total calculated volume (TCV) prior to
discharge.
- - In-Transit Difference
Compare the Total Calculated
Volume at the load port prior to sailing with the Total Calculated
Volume at the discharge port prior to discharge. If the total
volume of cargo quantity varies by more than the amount specified by
the interested parties or mutually agreed upon in the charter party,
notify the vessel's representative. If the discrepancy
remains after the vessel is re-checked, issue a Letter of Protest to
the vessel's representative.
Sections of text taken from API - MPMS Chapter 17 Marine Measurement
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