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1. (WO2017168144) METHOD FOR INSTALLING A SUBSEA STRUCTURE

Pub. No.:    WO/2017/168144    International Application No.:    PCT/GB2017/050876
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Thu Mar 30 01:59:59 CEST 2017
IPC: B63B 21/29
B63B 21/50
B65D 88/78
E21B 41/00
E21B 43/01
Applicants: SLLP 134 LIMITED
Inventors: BOWIE, Malcolm
Title: METHOD FOR INSTALLING A SUBSEA STRUCTURE
Abstract:
A method for installing a subsea structure at a target installation site in an underwater location is disclosed. The method includes connecting at least one mooring line and at least one leading line to the structure, and towing the structure via the leading line from a deployment position to the target installation site, such that the structure moves both vertically and horizontally between the deployment position and the target installation site. The mooring line is anchored, e.g. to an anchoring device on the seabed, and can incorporate a ballast to apply a sinking force to the structure in proportion to the length of unsupported line. The mooring line and the leading line can together stabilise the structure as it descends to the installation site. The non-vertical installation allows accurate structure placement, e.g. in crowded fields, with less sensitivity to tidal or current forces.