DNV—GL — RISK—BASED CORROSION MANAGEMENT

The present recommended practice by DNV GL is dealing with the risk based approach to the corrosion management. Today, more than sixty percent of the whole offshore fleet are past their twenty-year design age. Taking economic pressure into account, the offshore rigs are kept operating for much longer periods than they are designed for. In addition, there are numerous offshore rigs approaching this age.

It means that the operators of the rigs shall manage their material deterioration as necessary, i.e. pay close attention to corrosion and cracking. They shall also show the rig owners as well as the stakeholders and other interested parties the safety and integrity of the rigs in question. The content of this recommended practice commence s with the introduction to the problem followed by the section providing detailed process description.

The third section deals with the pre-assessment including identification of the potential risk for different zones while the next section covers risk ranking and screening. Three remaining sections of the document address the detailed examination stage of the process including assessment of the coating condition, remediation measures including cathodic protection, corrosion monitoring and inhibition, and lifecycle management.