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Survey Documentation 

Open Measurement

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Survey Documentation - Vessel Inspection

- On-Board Quantity Volume Calculation

The On-Board Quantity / Remaining On Board Report is to be competed prior to loading.  Determine the on-board quantity as follows -

a.   Liquid cargo and water - Use a wedge determination if the liquid does not touch all the bulkheads of the vessel's compartments.  Use trim/list corrections if the liquid is in contact with all the bulkheads in the compartment.  When sufficient material is available, take temperatures and samples.  Record and calculate corrected volumes on the Vessel Ullage/Sounding and Capacity Report. 

Transfer corrected volumes to the On-Board Quantity/Remaining On Board Report for totaling.

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b.   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.

c.   Sludge - No trim, list or wedge corrections are required.  If multiple point gauges are taken, however, they should be averaged and used.

d.   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 parties.

- Slop Tanks

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 loading system.

- 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 temperature.

- Sea Valves

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.

- Load On Top

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

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