Page 345 - Offshore Electrical Engineering Manual
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332 CHAPTER 1 Notes on Dynamic Positioning and Ballast Control
FIGURE 6.1.3
Typical multiscreen display. Top left, ballast gauging; top right, ballast tanks; bottom left,
ballast system and bottom right, LODIC loading calculator.
Courtesy Kongsberg.
loaded and riding high out of the water. If too much cargo is stored amidships, there
is danger of bowing at the keel and possibly breaking apart. The effects of fluid
dynamics aboard the vessel are intensified when material is pumped from tanks in
one section of the vessel to another as a part of onboard processing operations, mak-
ing ballast control more complex. Valve remote control and ballast level measure-
ments are generally included as part of the overall system and can be inputs to an
integrated control and safety system.
SEMISUBMERSIBLES
A semisubmersible’s ballast control systems are of vital importance, as they have
to take in large amounts of ballast water to reach their operating draught from their
transit draughts and discharge when operations are completed. Also, the nature of
