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ON
BOARD QUANTITY (OBQ): All the oil, water, sludge and sediment in
the cargo and associated lines and pumps on a ship before loading a cargo
commence. (this term may not apply to product movement).
QUANTITY
REMAINING ON BOARD (ROB): All the oil, water, sludge and
sediment in the cargo tanks and associated lines and pumps on a ship after
discharging a cargo has been completed, excluding vapour but including
clingage. (this term may not apply to product movements)
Determine
the OBQ/ROB for Liquids as follows:
(1)
By measurement determine the depth of liquid in each tank.
Measure-ments should be taken at as many points as possible to ascertain if the
liquid covers the tank bottom.
(2)
Where there is a sufficient depth of liquid determine its
temperature. If not assume the material to be at standard temperature.
(3)
Calculate and record corrected volumes using where appropriate :
(a)
Special dip tables or the wedge formula if the liquid does not
cover the bottom of the tank.
(b)
Trim/list corrections if the liquid covers the bottom of the
tank.
Note: When
applicable, estimate the volumes of oil residues adhering to the surfaces of
the tank walls and structure. Add this volume to the quantities determined
above.
(4)
Where possible obtain a sample of the OBQ/ROB.
Note:
Slops
which are to be loaded on top should be included in the OBQ/ROB report. Record
on the report from the nature of the materiel and the method used to determine
the volume in each compartment. Material in compartments not receiving cargo
should also be measured and reported on an OBQ/ROB report from.
This
report should be signed by the interested parties. If the vessels officer signed
under protest a note shall be made as to whether the vessel chose to have a survey
made by another company on its behalf .It is strongly recommended that Dry Tank
Certificates are not signed by inspectors. Refer to specific instructions
issued by interested parties concerning Dry Tank Certificates.
If
there is an unresolved dispute between the vessels personnel and the inspector
or other interested parties as to the quantity and character (liquid or
non-liquid) of the ROB this shall be reported immediately by telephone or telex
to all the parties concerned and noted on the OBQ/ROB report.
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Slops which are to be loaded on top should be included in the OBQ/ROB report. Record on the report from the nature of the materiel and the method used to determine the volume in each compartment. Material in compartments not receiving cargo should also be measured and reported on an OBQ/ROB report from.
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