Ships – Anchoring arrangement
Patent
1984-02-03
1985-05-21
Basinger, Sherman D.
Ships
Anchoring arrangement
59 84, 59 85, 114230, 114294, B63B 2150
Patent
active
045179131
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 load is imposed thereon. The remaining links of each length of chain have a strength sufficient to withstand without failure loads imposed thereon greatly in excess of the predetermined emergency load.
REFERENCES:
patent: 2347088 (1944-04-01), Dock
patent: 3077114 (1963-02-01), Murr
patent: 3905190 (1975-09-01), Pearlman
patent: 4033277 (1977-07-01), Schaper
patent: 4067282 (1978-01-01), Guinn et al.
patent: 4352382 (1982-10-01), Weidler
"Balt Anchor/Mooring Systems for Drilling Rigs", Baldt Incorporated, Chester, Pa., 1978.
Albertini Rocco D.
Grzeczkowski Thomas V.
Baldt Incorporated
Basinger Sherman D.
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