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We will be rolling out our
capabilities in support of dynamic positioning later this year (2007).
Please come back for an updated discussion on our Dynamic Positioning
services offered. For now we offer a basic introduction of the use of inertial
technology for significantly improving the reliability of deep water DP
operations.
How will inertial instruments help dynamic positioning?
Dynamically Positioned vessels are classed by a classification society
(DNV, Lloyds, ABS etc.) to a particular class (Class 1,2 3). This class
gives the contracting client some confidence in the capability of the
vessel. The classification of DP vessels requires a specific amount of
position reference systems. Vessels that are “classed” as Class 2 and Class
3 are required to have 3 independent position reference sensors (PRS’s or
PME’s) operating from at least 2 different operating principles.
A deep water DP vessel (drill ship, pipelay barge) has very little option
when it comes to providing these PME’s. They often use 2 DGPS systems and a
combination acoustic positioning system. This fulfills the class
requirements, but has in-built reliability issues. Often both of these
systems are just dual versions of exactly the same hardware and software/firmware.
When one fails, the other fails.
When these systems fail and are off line the vessel is no longer “in class”
(unless they have another level of redundancy). In many instances, the
client (operator) will then initiate a percentage day rate penalty for the
contracted day rate of the vessel. Zupt’s use of inertial technology adds a
complete new level of parallel redundancy through the intelligent fusion of
positioning observations with other sensors.
Please come and take a look at this page over the next several months as we
roll out our DP capability.
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