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• Re-design costs
piping system (some systems available on the mar-
taking into account the ship’s characteristics
• Out of service costs (the ship does not operate
ket require the traditional overflow/air vent systems
(General Arrangement, Ballast System, Electrical
during the installation of the system)
to be replaced with P/V valves);
Power Generators) in order to minimize the costs of
• impact on modification of ballast tank sounding
installation and maintenance.
2. Running costs
systems (where P/V valves are required to be fitted
• Maintenance costs (replacement of exhausted
the sounding system is probably to be modified).
filters, etc.)
should be taken into account. In particular, the skills
• Operational costs (chemicals used in the process, etc.)
In addition to the above, management aspects required by the crew to manage these systems are
4.Conclusions
to be carefully taken into account, considering that,
In conclusion, concerning the study carried out,
in the case of failure of the system due to wrong op-
3. Other aspects to be considered
we can summarize by saying that the impact of
erations, the producer’s guarantee does not apply.
Other important aspects that, together with the
the fitting of the BWT system on the ship design
technical issues highlighted above, may be typical
depends on:
also of other systems available on the market and
Thanks to the knowledge gained from the studies
currently under examination by RINA are:
• type of BWT system
carried out and continuously updated, RINA is as-
• impacts of the treatment system on the ballast
• type of ship
sisting owners and shipbuilders in the challenge of
tank coating; • impact on modification of the ballast tank overflow
identifying the most appropriate ballast water treatIn particular, the BWT system should be chosen
ment systems for their new and existing ships.