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Prewash Requirement Check (Annex II Reg 13)

Decision support for whether a prewash is required after discharging a Category X/Y cargo.

Chemical TankerPrewash
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Formula, assumptions, and limits

Prewash=CatX(CatY(HVSolidifying))\text{Prewash} = \text{CatX} \lor (\text{CatY} \land (\text{HV} \lor \text{Solidifying}))
SymbolMeaningUnit
HVHVHigh viscosity, > 25 mPa·s at unloading Tboolean
SolidifyingSolidifyingMelting point > 15 °Cboolean

Source: MARPOL Annex II Reg 13

In short

Decision support for whether a prewash is required after discharging a Category X/Y cargo.

Learn the theory Marine Tank Cleaning and Crude Oil Washing