Riser Centralizer System
1. Riser centralizer structure (typical 4 places)
2. Riser centralizer structure (retracted)
3. Radius of maximum riser excursion
4. Edge of moonpool
This photo shows a Riser Centralizer
System in the ship's moonpool during the installation process. When the
system is retracted, as shown above, it provides more than adequate
clearance for the BOP and mud mat.
When fully extended, the centralizer
beams form a solid protective restraint around the riser.
A Bardex Riser Centralizer System on
station in the moonpool of the R & B Deepwater Pathfinder.
Two of the four retracted centralizer beams are visible just beneath the
water surface
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Today's ultra-deepwater dynamically positioned ships
face numerous operational challenges, not the least of which is to
weather a surprise storm, capture and center the disconnected marine
riser, and provide guidance to the BOP as it passes through the wave
zone. For example, if the weather changes and suddenly becomes so severe
that it becomes difficult to achieve vessel station keeping, provisions
must be made to protect the well and the drilling equipment.
This is provided for by disconnecting the riser at the
vessel, thus removing the flex joint restriction. The risers can then be
protected by the Bardex Riser Centralizer System which retains
the riser securely in the middle of the moonpool, yet allows the vessel
to take excursion from the well's center position. The riser can then be
quickly reconnected once the storm has left allowing drilling to
recommence without significant delays.
If you would like to obtain information regarding the
design and use of a Bardex Riser Centralizer System for your project,
please contact your Bardex representative, or E-mail us directly at
bardex@bardex.com
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