Ballast is the
water that is taken on when a vessel is empty or partly loaded to
increase draft to properly submerge the propeller and maintain
stability, trim and list.
Clingage is the
cargo that adheres to all surfaces of the emptied portion of the tank
other than bottom surfaces.
Oil Washing ( Go to Tank Washing)
Quantity Option Certificate is a certificate signed by the
vessel and shore representatives acknowledging the amount of cargo
intended to be loaded. Generally, most product cargoes have a
tolerance based on either supplier, receiver or vessel
capabilities. Each party involved with the loading shall
agree to the quantity to be loaded.
Draft is the
depth of a vessel below the water line measured from the surface of the
water to the bottom of vessel's keel. The draft can be taken
at six positions (forward, amidships, aft - port and starboard
side). Deviations from measured and calculated figures
usually relate to deviations in the known constant and hog/stress.
Water (FW) is the volume of sea water (or other water
contamination) that is in a container that is not in suspension in the
contained liquid (oil). See also definitions for sediment and
Observed Volume (GOV) (Go to Volumes)
Standard Volume (GSV) (Go to Volumes)
Observed Weight (GSW) is the total weight
of all petroleum liquids and sediment and water (if any), excluding
free water, as determined by applying the appropriate weight conversion
factors to the gross standard volume.
Volume (Go to Volumes)
Inerting is a
procedure used to reduce the oxygen content of a vessel's cargo spaces
to 8 percent or less by volume by introducing an inert gas such as
nitrogen, carbon dioxide or a mixture of gases such as boiler / inert
gas generator flue gas.
gauge (dip sounding) is the measured distance from
the surface of the liquid to a fixed datum plate or to the bottom of
of Protest (Notice of Apparent Discrepancy) is a
letter issued by any participant in a custody transfer citing any or
all the conditions of dispute. This letter serves as a
written record that the particular action or finding was questioned at
the time of occurrence. The letter usually has a paragraph
reserving the issuer's right to refer to matter at a later date.
volume is the measurable amount of material that is free
flowing at the time of measurement.
(Heel) is the leaning or inclination of a vessel,
expressed in degrees port or starboard. If found to be other
than zero, list correction tables are to be used to correct the
measured ullage or sounding to compensate for the measured
list. See next paragraph.
(Heel) correction is the correction applied to
the observed gauge or observed volume when a vessel is listing,
provided that the liquid is in contact with all the bulkheads in the
tank. Correction for list may be made by reference to the
vessel's list correction tables for each individual tank or by
Top is defined as both a procedure and a practice.
on top is the shipboard procedure of collecting the settling water and
oil mixtures, resulting from ballasting and tank cleaning operations
(usually in a special slop tank or tanks), and subsequently loading
cargo on top of the slops and pumping the resultant mixture ashore at
the discharge port.
on top is the act of commingling onboard quantity with cargo being
loaded. The onboard quantity is the remnant of the previous
cargo or part load into the tank.
gauging is the activity of measuring cargo in a vessel
tank through two or more openings in the top of the tank.
Standard Volume (NSV) (Go to Volumes)
Standard Weight (NSW) is the total weight of all
petroleum liquids, excluding sediment and water and free water,
determined by deducting the S&W weight from the Gross Standard
volume is the measurable amount of material that is not
free flowing at the time of measurement. Non-liquid material
may include anyone or a combination of hydrocarbon waxes, water/oil
emulsions, sediment, or solidified cargo.
quantity (OBQ) (Go to Volumes)