Mooring system with frangible links
US4517913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1984 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Feb 3, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16G13/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A semi-submersible drilling rig having a plurality of chain lockers, a plurality of anchor windlass assemblies and a plurality of fairlead assemblies, a plurality of lengths of chain each having a multiplicity of interconnected links configured to move from a chain locker in cooperative relation through an associated anchor windless assembly and an associated fairlead assembly and an anchor for each length of chain connected to the end of the associated length of chain outboard of the associated fairlead assembly so as to engage with the water bottom. Each length of chain has at least one frangible link normally disposed within the associated chain locker inboard of the associated anchor windlass and fairlead assemblies of a different construction with respect to the remaining links of the associated length of chain. Each frangible link includes frangible portions operable to be tensioned when the frangible link is moved outboard of the associated anchor windlass and fairlead assemblies and a predetermined emergency load is imposed thereon. The frangible portions have precision configured cross-sections calibrated to separate by material failure when the predetermined emergency loa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.