3.1 Taking into account the need for the design
of sea chests to minimize skin friction of the ship's hull, generating
laminar flow of water over the hull form and facilitating good flow
of water into the ship's seawater suction pipes:
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.1 consideration should be given to the design
of the sea chest grate openings as a primary filter of larger marine
organisms;
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.2 securing arrangements should minimize the potential
for the sea grate to fall off during service, e.g., by hinging the
grate on the forward side;
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.3 installation of systems to allow for the cleaning
and treatment of the sea chest following ballasting, e.g., by installing
a steam and air connection or piping from Butterworth tank washing
systems (used for cargo tank washing); and
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.4 shutting of isolation sea suction valves to
prevent the fouling or contamination of the ballast water piping and
systems.