Passive riser tensioner
US5775845A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B21/502
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A passive riser tensioner apparatus for tensioning riser pipes on floating platforms and tension leg platforms utilizes one or more elongate elastic tensioning elements connected at top and bottom ends to the upper end of a riser pipe that are capable of being axially stretched. Each tensioning element has a threaded length adjustment rod and tension preload nut at its top end which adjusts the axial length to produce a predetermined preload tension force in the tensioning element between its connection to the riser pipe. A riser support collar slidably received on the length adjustment rod and riser pipe upper end is configured to be supported on the deck of the platform and allow axial movement of the riser pipe. A tension locking nut on the length adjustment rod releasably engages the length adjustment rod with the riser support collar when it is supported on the deck. The tension preload nut is rotated to stretch the tensioning element to produce the preload tension force prior to supporting the riser support collar on the deck. The tension locking nut is then rotated to engage the length adjustment rod with the riser support collar such that the predetermined preload tension f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.