Offshore Gravity Based Structure
A steel GBS are mostly
used when there is limited or no accessibility of Derrick Barges to install a standard
fixed offshore platform, for example in the Caspian Sea. A Gravity based
structure or GBS can be both concrete and steel and is generally anchored straight
onto the ocean floor. There are a number of steel GBS in the world nowadays
like in the offshore New Zealand and offshore Turkmenistan Waters (Caspian Sea).
Steel GBS do not generally
present hydrocarbon stock up facility. It is principally installed by pulling
it off the yard, by either land tow or water tow or both as the case may be and
then itself installing by handled ballasting of the sections with sea water.
While positioning the
GBS, throughout installation, the GBS may be connected to either a shipping
barge or any other such barge (so that it is sufficiently bulky to sustain the
GBS) by means of strand jacks. The jacks shall be freed steadily even as the
GBS is ballasted to make certain that the GBS does not sway too much from planned
position.
A gravity-based
structure (GBS) is a foundation construction fixed in position by gravity. A general
function for a GBS is an offshore oil platform. These structures are often assembled
in creeks since their sheltered region and adequate depths are especially required
for erection.
A GBS proposed for use
as an offshore oil platform is built of steel toughened concrete, usually with compartments
or sections which can be used to control the buoyancy of the completed GBS.
When accomplished, a GBS is towed to its proposed position and sunk.
Previous to exploitation,
a survey of the ocean floor is definitely carried out with the purpose of to make
sure it can hold up the vertical load applied on sea bottom by the GBS.
Gravity-based structures
are also deployed for offshore wind power Platforms. Many of the globe's
offshore wind plants are based on gravity-based structures.
The GBS are appropriate
for water depths more than 20 meters. The deepest enlisted offshore wind farm
with gravity-based structures is in Belgium, the Thornton Bank 1 with a depth approx
28 meters.
As offshore wind power
plants are increasing in size and shifting in deeper seas, the GBS is
considered more reasonable when compared with other offshore base formations.
