A subsea anti-cabling device 20 for a multi-cable subsea lifting system comprises two or more sets of two or more spaced apart and slidable cable connections 22a, 22b, 24a and 24b for neighbouring load cables 4a, 4b and a rigid framework 26 between each set of cable connections 22a, 22b, 24a and 24b. The multi-cable subsea lifting system may comprise two or more load-cable lifting apparatus 2a, 2b, a load cable 4a, 4b extending from each load-lifting apparatus 2a, 2b to a subsea co-terminal loading point which may be a triplate 14, one or more subsea anti-cabling devices 20, an anti-cabling device lifting apparatus 30 and an anti-cabling line 28 extending from the anti-cabling device lifting apparatus 30 to one anti-cabling device 20. A load cell 18 may monitor the tension and/or torsion of the load cable 4a, 4b. The cable connections 22a, 22b, 24a and 24b may be open sleeves and attachment clips and the connections of each set may be separate 22a, 22b and 24a, 24b or a continuous body 52a, 52b. The rigid framework 26 may include bracing members 42, 58 and cross-struts 40a, 40b, 56a, 56b. The lifting system may be carried on a ship such as a pipe laying service vessel or PLSV 6. The anti-cabling device 20 is able to maintain a defined distance or space between the cables 4a, 4b due to its rigid framework 26 and thereby prevent twisting or entanglement of the load cables 4a, 4b. The anti-cabling device 20 is also slidable with respect to the load cables 4a, 4b, allowing it to be best positioned or deployed where the concern of cabling is more expected.
Multi-cable subsea lifting system
2015-06-03
Patent
Elektronische Ressource
Englisch