Riser tensioning system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 17, 2004
Grant Date -
N/A
app pub date -
Jun 19, 2002
filing date -
Aug 31, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a substructure (10) for a floating oil or gas production platform, an arrangement to tension a plurality of risers (16) extending from the sea bed up to the substructure, the arrangement comprising: a conventional hydraulic tensioner/heave compensator (17) for each riser, in which there is a soft spring formed by a piston cylinder combination acting against an accumulator, the heave compensators for the risers being disposed to compensate for vertical oscillations of relatively short period (e.g. from 1 second to about 5 minutes) between the risers and a vertically adjustable Xmas tree deck (18); and a vertical position adjustment system (21/22) capable of intermittent operation to adjust the vertical position of the Xmas tree deck (18) relative to the floating substructure (10) to compensate for longer term changes which would otherwise cause the individual riser's tension or stroke position to depart from its target value/range; the Xmas tree deck vertical position adjustment system being normally located in one particular position within its range of movement to compensate for the longer term changes.
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