safety data sheet
safety data sheet
safety data sheet
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- indicates not tested<br />
� Shading indicates 15% effectiveness criterion used to indicate likely field effectiveness<br />
Test method generally underestimates dispersant effectiveness on light crude oils and overestimates<br />
dispersant effectiveness on fuel oils<br />
Full test results avavilable in Cawthron Technical Reports<br />
Effectiveness test results of Maritime NZ dispersant stocks on NZ Crude Oils<br />
Crude oil<br />
source<br />
Water<br />
Temp<br />
Corex<br />
it<br />
9500<br />
Corex<br />
it<br />
9527<br />
Gam<br />
len<br />
OSD<br />
LT<br />
Slickg<br />
one<br />
LTSW<br />
Slickg<br />
one<br />
NS<br />
Tui Crude 15º X � X � X X<br />
10º X<br />
Tergo<br />
2005<br />
Comment<br />
Maari Crude 18.5º � X X X X X - The oil can be dispersed only<br />
at the earlier stage of its<br />
weathering,<br />
- Weathered oil, with its high<br />
pour point, is not favorable to<br />
chemical dispersion.<br />
Manaia<br />
Crude<br />
18º<br />
10º<br />
Kupe Condensate - Kupe Condensate has a relatively high pour point and high wax content. If<br />
the seawater temp is above the oil pour point, natural dispersion and<br />
evaporations rates are likely to be high. Chemical dispersion is generally<br />
undesirable because it will reduce evaporative losses and transfer the most<br />
toxic oil fractions into the water.<br />
- When sea temperature is below the pour point, or following weathering,<br />
spilt oil is likely to solidify relatively quickly or form a low toxicity waxy residue<br />
after the light ends evaporate. In either state, the effectiveness of chemical<br />
dispersants will be greatly limited as it will be difficult to apply them at the oilwater<br />
interface where they work.<br />
Maui Condensate Dispersant use not considered necessary due to rapid evaporation of vast<br />
majority of oil.<br />
Dispersant Application<br />
Sea state<br />
Calm conditions<br />
In very calm conditions there may be insufficient energy in the sea to create the small droplets<br />
required for effective dispersion of the oil. Consequently, care must be taken to ensure that either<br />
suitable agitation is provided to break up the treated oil or dispersant is not applied in these conditions.<br />
Rough conditions<br />
When the wind reaches Force 5 (17 – 21 knots) and above, the natural turbulence of the sea means<br />
that oil will be regularly covered by breaking waves. Under these conditions the application of<br />
dispersants can lead to excessive wastage as the water prevents dispersant reaching the oil. In<br />
National Marine Oil Spill Contingency Plan Page 5 of 45<br />
Chapter 7 – Dispersants Use Issue 7 June 2012
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