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Dividing vessels into types, series and classes are different methods of vessel categorisation. The class of a vessel determines the standard and operating conditions a vessel is required comply with. Vessel classes are divided according to usage, area of operation and special ability (for example Ice Class, Oil Recovery Capability, etc.). A vessel series as a succession of usually continuously numbered vessels with a common characteristic and a vessel type represents a particular form of vessel decided by size, (for example PANAMAX), or usage (for example MULTI PURPOSE).
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