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Survey Documentation 

Open Measurement

Closed / Restricted Measurement

Data Collection

Special Considerations

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Survey Documentation - Vessel Inspection After Loading

- Draft, Trim and List

Record the draft, trim and list on the Vessel Ullage / Sounding and Capacity Report.  Apply trim and list corrections where applicable.

- Vessel Lines

Before measuring the vessel, request that the vessel line be drained into the cargo tanks.  An empty or slack tank generally is used for this purpose.  These tanks should be located towards the aft end of the vessel if the vessel is trimmed by the stern.

Caution should be exercised on multi-grade cargoes in order to avoid commingling the line contents of different products.  Record the capacity of the lines and into which tank they were drained.

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All internal transfers of cargo should be completed and all tank valves should be secured prior to gauging.  Loading lines should be vented prior to gauging.  It is common in the case of multi-grade petroleum product loadings also to seal the individual tank suction valves.

- Vessel Gauges  

Take gauges, water cuts and temperatures on all cargo compartments.  Inspect for the presence of petroleum in non-designated cargo spaces, ballast tanks, cofferdams and void spaces.  If petroleum is found, measure it in the same manner as the petroleum in the cargo compartments.  The data should be recorded on the Vessel Ullage/Sounding and Capacity Report.  Where applicable, show both the actual ullage as measured and trim and list corrected ullage on the Vessel Ullage/Sounding and Capacity Report.  The report should indicate whether measurements were manual or automatic and whether tanks on the vessel were inerted during ullaging.  The observed gauge heights should be recorded in the field work book.

In some instances, it is impossible to determine the observed reference height, water cut and innage gauge because of the heavy nature of the product.  Every effort should be made, however, to identify the proper reference point for ullage measurement as described by the vessel calibration tables.  The location of the reference point should be recorded in the inspection report.

Vessel measurements taken through non-slotted standpipes may be inaccurate as a result of plugging at the base of the pipe, capillary action or pressure differentials.  Additional measurements may be needed from other locations when this condition exists.  Note in the report, the existence of this condition.

In the case of heavy viscous materials, air and/or inert gases may be entrained in the product.  An appropriate settling time should be allowed if possible.  If the vessel is gauged immediately after completion of loading, this fact should be noted on the time log and in ullage report.

In operations involving lightering each receiving vessel as well as the delivering vessel should be gauged prior and upon completion of lightering.

- Water Cut Measurement

Measure free water during the course of ullaging each compartment.  Record the type of water-finding paste or device that is used to determine the oil/water interface.  Record the interface and any oil emulsion that is detected.  If a sufficient quantity of free water is found, take a sample of the water.

Products with densities heavier than water my need to water cut on top of the product.  If it proves impossible to take a water cut measurement, then alternative sampling measures should be taken.

If free water is detected in certain products, a protest should be made to the vessel's representative and to the loading facility and all interested parties should be notified immediately.

- Vessel Temperature

Individual compartment temperatures on the vessel should be taken concurrent with ullaging.  Temperatures should be taken at the upper, middle and lower mid-point levels and the measurements should be averaged to determine the temperature of each compartment.

In the case of heated materials, the portable electronic thermometer (PET) should have a calibrated range of accuracy that meets the desired temperature range of the material to be checked.

Caution: Temperatures that are taken at or near heating elements may distort temperature profiles.  Exercise care when average temperatures are calculated.

Sections of text taken from API - MPMS Chapter 17 Marine Measurement

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