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- Draft, Trim and List
Record the draft, trim and list
on the On-Board Quantity / Remaining On Board Report and the Vessel
Ullage / Sounding and Capacity Report.
When barges have no list or
trim correction tables, the cargo inspector must note this fact in the
report, along with data on the relative location of the gauge hatch -
forward, center or aft. The lack of list and trim tables
could impair the voyage analysis and application of VEF.
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Remaining Ballast
For most cargoes, there should
be no remaining 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 the ballast tanks. Use the
On-Board Quantity / Remaining On Board Report to record these
measurements.
It may be noted that, if
simultaneous de-ballasting must be performed during loading operations,
determine the reason from the vessel's representative and record it on
the inspection report. Indicate single / double valve
separations, if any, between clean/dirty ballast and cargo systems.
- Vessel Lines and Tanks
All vessel tanks, including
cargo, ballast and cofferdams should be inspected prior to loading.
For crude and dirty products,
request that the vessel's personnel drain the deck lines into the cargo
or slop tanks. Measure the amount of cargo or ballast water
dropped into the tank and sample it if a sufficient quantity
exists. In addition, record on the Vessel Ullage / Sounding
and Capacity Report the capacity of the lines that were
drained. Report the transfer of any engine slops or other
liquid into the cargo or slop tanks.
For clean petroleum products,
the pipelines on the vessel must be scrutinized closely for cleanliness
prior to loading. If the previous cargo poses a contamination
problem, all lines and pumps should be cleaned thoroughly and
drained. Noted on the inspection report how cleaning and
draining was accomplished.
When the vessel is inspected
for tank acceptability prior to loading, the entire loading pipeline
system should be open. Inspection should include all tank
valves, block valves, pump casing drains, strainer plugs and manifold
header valves. With the entire system open, any remaining
residue may be apparent by sight or smell.
On most petroleum product
movements, especially on cargoes that are designated as clean products,
an internal tank inspection should be performed while the tank is free
of gas. Approved safety procedures for entering the tank must
be observed. The tank inspection must be conducted in
accordance with the Charterer's tank cleanliness requirements.
For vessels on which the
presence of inert gas and/or retains in the tanks will preclude and
internal tank inspection, additional steps may be required to determine
tank acceptability.
The type and condition of tank
coatings, along with the method of cleaning the tanks, must be
determined and noted. If necessary, the condition of the
heating coils should be checked.
A wall wash or wipe test may be
needed to verify a tank's acceptability. If possible
contamination is suspected, loading should not begin until all parties
mutually agree to proceed.
On multi-grade vessels, it may
be necessary to load the vessel in a certain order to avoid
contamination of certain grades. This process should be
discussed and the order of loading by grade and/or product should be
agreed upon before operations begin.
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On-Board Quantity Measurement
Obtain and record reference
heights from the calibration tables prior to taking opening gauges and
water cuts. Record the observed gauge heights in the field
workbook. Investigate and report any discrepancies.
Determine the amount and nature of any material on board (on-board
quantity) prior to loading, including all in-transit cargo and material
in non-designated cargo spaces (Refer to MPMS Chapter 17.2).
Describe material found in the bottom of tanks as liquid cargo,
non-liquid cargo, sediment/sludge, or free water or a combination of
each.
Sections of text taken from API - MPMS Chapter 17 Marine Measurement
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