Proposals for the improvement of security in special anchor operations for the setting of offshore structures

Abstract

The aim of this Final Degree Project is to suggest improvements in terms of security and positioning operations in the offshore space, specifically offshore structures that are fixed to the seabed by spread anchor lines. In order to provide these improvements, this project will offer a step by step description of the operation, focusing on oil rigs, especially the semisubmersible type. These operations are held by specialized vessels named Anchor Handling Tug Supply (AHTS), fitted with specific equipment for such activities and furthermore with the Dynamic Positioning System (DPS), whose classes and principles are also explained in further detail. In order to describe the dynamic positioning system, the AHTS vessel Havila Neptune’s, ship particulars, drawings and characteristics will be presented in detail. As these activities are carried out using large mooring lines in deep waters and deploying heavy equipment, the risk in these operations are considerable. These are carried out even in rough sea states and with multiple external loads and forces. To finish, security improvement Proposals in Anchor Handling operations will be offered, so as to prevent risks, both human and material.