Triality - Presstogo
Triality - Presstogo
Triality - Presstogo
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10 triAlity vlcc<br />
A ballast-free design<br />
A conventional vlcc carries<br />
sea water as ballast in transit in<br />
unloaded condition and during<br />
loading and discharging in port.<br />
ballast water is used by all vlccs today for two purposes:<br />
• to achieve sufficient draft and suitable trim<br />
• to control hull stress levels<br />
the ballast operations have two main unwanted effects:<br />
• ballast water may contain organisms that can cause damage when released<br />
into foreign ecosystems. this is why the imo has established the<br />
international convention for the control and management of ships’<br />
ballast water and sediments. expensive ballast treatment systems will<br />
also increase fuel consumption.<br />
• Additional fuel is needed to transport 80–100 000 tons of ballast<br />
water.<br />
triality has a ballast-free design with the following characteristics:<br />
i. new transverse cargo tank divisions enable cargo tanks to be loaded<br />
without the need for ballast for strength or trim/heel compensation<br />
ii. the new v-shaped hull form provides sufficient draft without cargo or<br />
ballast<br />
iii. the new hull shape has a mean average of 16% less wet surface on a<br />
roundtrip, a lower block coefficient and is 11% more energy efficient
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