Ballast Water Management Decision Support System - Global Maritime Transport and Ballast Water Management: Issues and Solutions - page 250

Fig. 16 PSA decision (7) on vessels compliance with the BWM requirements (This fi gure can be
downloaded from http://extras.springer.com/ )

Decision 9: Stop Deballasting?

If a vessel is found non-compliant with BWM requirements, PSC may decide to
prevent deballasting. The decision regarding the prevention of a vessel from debal-
lasting is basically related to the risk posed by the ballast water intended for
discharge.
In case a non-compliant vessel has already started deballasting and the risk posed
is unacceptable, such a vessel will be stopped from deballasting (see Fig. 18 ).
When a vessel was required to stop deballasting, the PSA authority notifi es that
vessel regarding possible alternative BWM options available. If feasible, the vessel
conducts alternative BWM.

Decision 10: Allow Discharge of Unmanaged Ballast Water?

This is a position where none of the “regular” or alternative BWM options was
implemented. A vessel in this situation would be one that:

- has declared to have on board unmanaged ballast water intended for discharge;

- did everything in her capability to comply with the requirements;

- was not able to conduct requested regular BWM practice; as well as

- was not able to conduct alternative BWM practices.