Non-liquid cargo - Take any additional measurements
required to determine whether the on-board quantity is evenly
distributed across the bottom or is sloped to the aft end of the
compartment. If the material is evenly distributed, no
corrections to calibration table volumes are required. Apply
wedge or trim/list corrections as appropriate if the material is sloped.
Sludge - No trim, list or wedge corrections are
required. If multiple point gauges are taken, however, they
should be averaged and used.
Sediment - No trim, list or wedge corrections are
required. Use ullage/sounding tables for zero trim & list.
Note on the On-Board quantity /
Remaining On Board Report the nature of the material and the method
used to determine the volume in each compartment. Material in
non-load-on-top compartments should be measured and reported on the
On-Board quantity / Remaining On Board Report.
On-Board Quantity Sampling
If a disagreement exists about
the identity and nature of the OBQ and if a sufficient quantity of
petroleum and/or free water is found, take a sample of each.
Obtain a composite sample of all in-transit cargo quantities on the
vessel if possible. Seal the sample and retain it.
Disposition of retained samples is to be specified by the interested
Measure the contents of the
slop tanks to determine the interface and separate quantities of free
water and slop oil. Take the temperature of and sample the
oily layer. Take a separate sample of the water
layer. Determine the API gravity and the sediment and water
content of the oily layer sample. Record the results on the
Slops Record. Compute the quantities as indicated on that
form. If any slops are to be commingled with subsequent
cargo, they are to be treated as on-board quantities and recorded on
the On-Board quantity / Remaining On Board Report. Slop tanks
on product vessels generally should be segregated from the cargo
On-Board Quantity Temperatures
A temperature measurement must
be obtained when sufficient liquid is available. The
temperature should be taken from the midpoint of the oil or the oily
layer. Solids and small quantities of liquid for which a
temperature cannot be obtained may be assumed to be at standard
Confirm in the presence of the
vessel's personnel that sea valves and overboard discharge valves are
in the closed position and sealed before loading commences.
Seal valves to the extent possible, so as to be able to determine
whether they were used during loading. Record the seal
numbers on the On-Board Quantity / Remaining On Board Report.
Fill out a Load-On-Top
Monitoring Report. If no load-on-top procedure was followed,
fill in the top information and section 1 of the report accordingly.
- Bunker Inspection
A bunker inspection should be
performed before and after loading. Note if the vessel
intends to bunker during the loading. Gross observed volumes
should be compared with bunker receiving documents and with normal
consumption rates. Bunker samples should be taken and tested
upon request. The laboratory results may be reported on the Bunker Inspection Report.
On cargo barges, if requested, inspect and report the quantities in the
diesel fuel tanks used to fuel the engine-driven pumps.
Sections of text taken from API - MPMS Chapter 17 Marine Measurement