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Survey Documentation 

Open Measurement

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Survey Documentation - Vessel Inspection After Loading

- Ballast Tanks

Inspect ballast tanks and record the quantity of ballast aboard.  Record the presence of and sample any measurable petroleum in any ballast tanks if possible.  Report any visible seepage into and from cargo and ballast tanks and notify all interested parties.

- Vessel Sampling

Take samples from each vessel compartment in such a manner that a composite sample representative of the total of each grade of cargo may be prepared in the laboratory for appropriate testing.

The representative sample will be made by combining the vessel's individual tank samples in a ratio approximating the volume of each tank to the total volume of the grade of cargo loaded.

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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.

 - 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

  1. The shore terminal

  2. The receiving terminal via the vessel master

  3. The independent inspector

  4. 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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