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When the existence of
stratified material is known or suspected, individual upper, middle and
lower samples should be drawn and analyzed to determine the degree of
stratification. All interested parties should be notified
accordingly. A sample of the volumetric hand-blend of the
loading shore tanks should be placed on board the vessel and
distributed to all interested parties.
It may be noted that on blended
cargoes, vessel tank samples often will not be representative of
proportion hand-blended samples that were tested at the port of loading.
Obtain samples for
slops. Keep these slops samples separate from cargo samples.
In the case of some petroleum
products, individual tank samples rather than composite samples are
required. In these cases, it is important that each container
be flushed with the product before the sample is drawn in order to
ensure the cleanliness of the sample containers. Care must be
taken to assure samples are handled in a manner that prevents loss of
the light ends. Commingling of samples of different products
an/or grades must be avoided.
If the presence of moisture is
suspected in the cargo or if free water is found, then adequate
representative samples of the cargo should be drawn. At least
one sample of the cargo should be taken from the compartment floor via
a bottom sampler.
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Sample Handling
Sufficient samples should be
obtained to meet the requirements of interested parties and regulatory
agencies. Sampling and testing requirements are generally
specified by interested parties. Identical samples should be
provided for the following
-
The shore terminal
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The receiving terminal via the
vessel master
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The independent inspector
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All other parties designated to
receive the samples
Samples that are placed on
board the vessel for delivery to the representative at the discharge
port should be sealed and acknowledged with at receipt signed by the
vessel's representative. A copy of the signed receipt should
be included in the inspection report.
The length of time that samples
must be retained should be established in a manner that is consistent
with the circumstances, experience and policies of the parties involved
in the custody transfer.
- Sea Valves
Confirm in the presence of the
vessel's personnel that the sea valves and overboard discharge valves
are closed and that the seals remain intact. If previously
sealed valves are not intact, attempt to ascertain why the seals were
broken and, if appropriate, notify all interested parties.
Record the findings in the inspection report.
- Bunker Inspection
The volume of bunker oil on
board the vessel as well as any bunkers loaded should be measured and
recorded. Reconcile the gross observed volume loaded and the
advised quantity consumed in port with the gross observed volume on
hand at arrival. Note and report any discrepancies.
In the case of cargo barges, if
requested, inspect and report the quantities in the diesel fuel tanks
that are used to fuel the engine-driven pumps.
- Volume
Calculations
Use the Vessel Ullage/Sounding
and Capacity Report or a similar form to make sailing volume
calculations. 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
supplied by the terminal. 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. Determine the total calculated
volume and subtract the on-board quantity for a comparison with the
shore tank's calculated volume loaded.
Sections of text taken from API - MPMS Chapter 17 Marine Measurement
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