Persistent floaters

Some amendments of MARPOL Annex II and IBC Code regarding persistent floating cargoes come into effect in 2021.

Defintion

Persistent floater means a slick forming substance with the following properties:
– Density: ≤ sea water (1025 kg/m3 at 20°C);
– Vapour pressure: ≤ 0.3 kPa;
– Solubility: ≤ 0.1% (for liquids) ≤ 10% (for solids); and
– Kinematic viscosity: > 10 cSt at 20°C.

Control of discharges

For substances assigned to category Y that are persistent floaters with a viscosity equal to or greater than 50 mPa*s at 20ºC and/or with a melting point equal to or greater than 0ºC, as identified by ‚16.2.7‘ in column ‚o‘ of chapter 17 of the IBC Code, the following shall apply in the areas in paragraph 9 (see below):

.1 a prewash procedure as specified in appendix VI of Marpol Annex II shall be applied;
.2 the residue/water mixture generated during the prewash shall be discharged to a reception facility at the port of unloading until the tank is empty; and
.3 any water subsequently introduced into the tank may be discharged into the sea in accordance with the discharge standards in regulation 13.2 of Annex II.

Areas where persistent floaters must be prewashed acc to Marpol Annex II Reg 13 § 9

List of persistent floaters

Acid oil mixture from soya bean, corn (maize) and sunflower oil refining
Camelina oil
Cashew nut shell oil (untreated)
Castor oil
Cocoa butter
Coconut oil
Coconut oil fatty acid
Corn Oil
Cotton seed oil
Fatty acids, (C12+)
Fish oil
Grape Seed Oil
Groundnut oil
Illipe oil
Jatropha oil
Lard
Mango kernel oil
Non-edible industrial grade palm oil
Olive oil
Palm acid oil
Palm fatty acid distillate
Palm kernel acid oil
Palm kernel fatty acid distillate
Palm kernel oil
Palm kernel olein
Palm kernel stearin
Palm mid-fraction
Palm oil
Palm olein
Palm stearin
Paraffin wax, highly-refined
Rapeseed oil
Rapeseed oil (low erucic acid containing less than 4% free fatty acids)
Rice bran oil
Safflower oil
Shea butter
Soyabean oil
Sunflower seed oil
Tallow
Tallow fatty acid
Tung oil
Used cooking oil (Triglycerides, C16-C18 and C18 unsaturated) (m) (n)
Vegetable acid oils (m)
Vegetable fatty acid distillates (m)
Vegetable oil mixtures, containing less than 15% free fatty acid (m)