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发表于 2009-7-28 14:53
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来自： 中国北京
IMO
Class 1 Loss of position may occur in the event of a single fault.
Class 2 Loss of position should not occur from a single fault of an active component or system such as generators, thruster, switchboards, remote controlled valves etc. But may occur after failure of a static component such as cables, pipes manual valves etc.
Class 3 Loss of position should not occur from any single failure including a completely burnt fire subdivision or flooded watertight compartment. A single fault includes a single inadvertent act by any person onboard the vessel.
The Classification Societies define the different class as follows:
ABS
DPS 1 Vessels are to be fitted with a dynamic positioning system which is capable of automatically maintaining the position and heading of the vessel under specified maximum environmental conditions having an independent centralized manual position control with automatic heading.
DPS 2 Vessels are to be fitted with a dynamic positioning system which is capable of automatically maintaining the position and heading of the vessel within a specified operating envelope under specified maximum environmental conditions during and following any single fault excluding a loss of compartment or compartments.
DPS 3 Vessels are to be fitted with a dynamic positioning system which is capable of automatically maintaining the position and heading of the vessel within a specified operating envelope under specified maximum environmental conditions during and following any single fault including a loss of a compartment due to fire or flood.
D.N.V.
AUT An automatic position keeping system with a remote thrust control back up and a position reference back up.
AUTR An automatic position keeping system with redundancy in Technical design.
AUTRO An automatic position keeping system with redundancy in technical design and physical arrangement. |
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