Abstract-Corrosion represents one of the largest through life cost component of ships. Ship owners and operators recognize that combating corrosion significantly impacts the vessels' reliability, availability and through life costs. Primary objective of this paper is to review various inspections, monitoring systems and life cycle management with respect to corrosion control of ships and to develop the concept of "Corrosion Health" (CH) which would quantify the extent of corrosion at any point of ships' operational life. A system approach in which the ship structure is considered as a corrosion system and divided into several corrosion zones, with distinct characteristics, is presented. Various corrosion assessment criteria for assessment of corrosion condition are listed. A CH rating system for representation of complex corrosion condition with a numeric number along with recommendations for repair/maintenance action is also discussed.Index Terms-Corrosion control of ships, corrosion health, corrosion of ship structure, marine corrosion, monitoring systems, ship inspections.

Corrosion combined with fouling growth can interfere with the operation of submerged equipment, impose increased loading stresses and accelerate deterioration of marine structures, and adversely affect the performance of ships by increasing hydrodynamic drag, which necessitates the use of more power and fuel to move the ship through the water. The protection of the submerged portions of a ship's hull seems to have been long acknowledged and practiced but corrosion related failure of ship components continue to occur giving economical loss to ship owners. An enlightened approach to materials selection, protection and corrosion control is needed to minimize the risk of failures or major renewals of hull structures during the ship's expected life span. Further, Proper and cost effective corrosion protection measures are necessary to maintain the asset value of the vessel with a special emphasis on the means and methods now being adopted in international regulatory regimes to contain it. This paper addresses the causes of corrosion in ship and the way in which corrosion can be reduced or entirely eliminated in a ship by integrating both technical and non technical methods of corrosion control.

The fully coupled dynamic analysis of spar type offshore floating wind turbine is presented and a brief conceptual dimension of floater, mooring, tower, and turbine properties were used. The numerical model is generated in ANSYS-AQWA & WAMIT along with the combined wind and wave actions on the structure are analyzed. The numerical results are generated in time domain. The delta catenary mooring is employed on the spar-type floater. The aero-hydro-servo-elastic simulation is used in the analysis of the spar-type floating wind turbine. Various Operational and extreme environment conditions have been simulated. Further, the power production and the effects of aerodynamic and hydrodynamic loads on the spar type floating wind turbine are investigated.

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