Semi-submersible drilling unit with cylindrical ring floats
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 26, 1989
Issued Date -
N/A
app pub date -
Sep 30, 1987
filing date -
Oct 22, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is described a vessel such as a semi-submersible drilling unit having a drilling deck structure with a plurality of columns depending from the deck. Pontoons are provided at the ends of the columns and a buoyant configuration modifying sleeve-like element is mounted around the columns. The sleeves are annular in cross-section and of generally cylindrical form and terminate at their lower ends in cuffs of reducing outer diameter. This provides an inwardly tapered or curved end to the sleeve. A cable and pulley arrangement is provided for vertically moving the sleeves along the columns and for locating them on the columns close to the unit transit waterplane and at a survival waterplane position.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully