multilevel temperatures should be taken based upon the liquid depth of the material in the tank as per “API MPMS Chapter 7.2 – Temperature Determination: Portable Electronic Thermometers”. Measurements shall be averaged to determine the temperature of each compartment. The temperature measurement device shall have a calibrated range of accuracy that meets the desired temperature range of the material to be checked. NOTE: Temperatures taken at or near heating elements may distort temperature profiles.
Commingling of samples of different products and/or grades must be avoided.
Should this period not be defined, the default is to keep the samples for 90 days after the end date of the operation. Additionally, in the event of a claim samples should be stored in a quarantine area and away from samples that are not under dispute.
Take samples of slops. Keep these slops samples separate from cargo samples.
Immediately label each sample with the appropriate tank number and other pertinent data.
3.3.7 Sea Valves
3.3.6 Sample Handling
Confirm in the presence of the vessel’s personnel that 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.
Samples should be obtained in sufficient quantity to meet any analysis, retain, and distribution requirements. Interested parties generally specify sampling and testing requirements. Identical samples should be provided for the following, where required:
3.3.5 Vessel Sampling
Samples should be taken from each vessel cargo compartment in such a manner that a volumetric composite sample, intended to represent the total of each grade of cargo, may be prepared for testing see “API MPMS Chapter 8.1 - Standard Practice for Manual Sampling of Petroleum and Petroleum Products”. This composite will be made by combining the vessel’s individual tank samples in proportion to the volume of each tank to the total volume of the grade of cargo loaded. Appropriate containers shall be used that do not contaminate the samples. When the material is known or suspected to be stratified, spot samples should be drawn and analyzed to determine the degree of stratification. Care must be taken to assure samples are handled in a manner that prevents loss of the light ends.
3.3.8 Volume Calculations
a) the loading terminal,
Report both the actual ullage/innage as measured and the ullage/innage corrected for trim and list, include the measurement and quantity of free water, the gross observed volume, and the temperature for each compartment on the vessel. Calculate the gross standard volume for each tank, using the average temperature for each tank and the supplied density / API. Do not use an average temperature for the entire vessel. Determine the Total Calculated Volume [TCV] and subtract any on-board quantity measured prior to loading for a comparison with the shore Total Calculated Volume [TCV] delivered.
b) the receiving terminal via the vessel master,
c) 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 (consignee) or to other third parties should be sealed and recorded on a Sample Receipt, signed by the vessel’s representative or third parties taking receipt of the sample(s). A copy of the signed receipt should be stored in the job file. The length of time for samples to be retained should be established in a manner that is consistent with the circumstances, experience, and the policies of the parties involved in the custody transfer.
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