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BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

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ANNEX 1<br />

A Guide to the Relationship between the Appearance, Thickness and<br />

Volume of Floating Oil<br />

The figures in the table and the relationship - colour versus volume - up to code 5 were<br />

derived from the results of sea exercises with controlled oil discharges. Beyond that the<br />

relationship emerges from the experience of the International Tanker Owners Pollution<br />

Federation (ITOPF) and oil-spill survey teams.<br />

Code Appearance/Colour Approximate Approximate<br />

thickness, microns Volume<br />

m3fkm2<br />

1 silver@<br />

2 grey<br />

3 rainbow<br />

4 blue<br />

5 blue/brown<br />

6 brown/black<br />

7 dark brown/black<br />

<strong>No</strong>te:<br />

brown/orange mousse see note<br />

0,02-0,05 0<br />

091 091<br />

O,3 O,3<br />

190 1<br />

<strong>59</strong> 5<br />

15-25 15-25<br />

> 100 > 100<br />

A brown/orange mousse shows the presence of water-in-oil emulsion. While the thickness is usually l-4 mm,<br />

it may even be higher. The percentage of oil in the emulsion can only be assessed with samples. The presence<br />

of mousse, however, shows a very high quantity of oil which would, in the case of discharges dealt with in this<br />

Manual, correspond to an exceptionally large discharge.<br />

1) ITOPF 1981. Aerial observation of oil at sea. The International Tanker Owners Polllution Federation Ltd.,<br />

Technical Information Paper 1, London.<br />

344

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