5. Sample integrity
A means should be provided to seal the sampling apparatus throughout the period of the supply, except in the case of tank sampling.
6. Sampling location
Samples should be drawn continuously throughout the delivery, except in the case of tank sampling.
Generally, for bunker deliveries there is no single perfect location for obtaining a representative sample. However, the optimal location for obtaining an automatic or continuous-drip representative sample is at either end of the bunker delivery hose.
The objective is to obtain only one representative sample or the sub-samples derived therefrom (see paragraph 7 - Sample handling). If tank sampling is adopted, sufficient samples should be taken to satisfy all parties.
7. Sample handling
Where manual subdivision of the representative sample is required, subdivide into equal portions with a minimum of three one litre sample containers, making three or four passes in turn to fill each container in the presence of the ship's Representative and Supplier's Representative.
8. Sealing of samples
Immediately following collection of the samples, security seals with means of identification should be installed by the Supplier's Representative in the presence of the ship's Representative. Labels containing the following information should be secured to the sample container:
(a) location at which, and the method by which, the sample was drawn;
(b) date and time of sampling;
(c) name of bunker tanker;
(d) name of the ship;
(e) signatures and names of the Supplier's Representative and the ship's Representative;
(f) details of seal identification; and
(g) bunker grade.
Details of the seal identification should also be recorded on the bunker delivery note.
9. Sample retention
On completion of bunkering operations the sealed sample is to be retained under the ship's control until the fuel is substantially consumed, but in any case for a period of not less than 12 months from the time of delivery. Means should be provided to ensure adequate sample integrity under proper storage conditions.
