Operações e análises de risco de navios especiais posicionados dinamicamente

Abstract

The Dynamic Positioning System found on board the maritime units, is a leading systems used on board the DPO -Dynamic Positioning Operator. "Reference System" for platforms with dynamic positioning, contributes greatly to maintaining the position. Thus, one can maintain a properly positioned platform to facilitate the drilling operations, monitor the angles of the risers, follow the BOP, navigate relative to the seabed and the well where is, plot obstacles, measure distances , markings, guide the ROV, and get acquainted with all the essential data operations such as getting local depth, temperature, salinity, among other parameters. Furthermore, in an emergency or even eventual abandonment of the unit, this system can be used in the latter case or according to need, in order to isolate the well and protect the crew against gases, kickor blowout. For operations with DP vessels have a greater chance of being successful, the LRC -Lloyd's Register Consulting-developed a risk analysis that was studied and it was established some limits of safety and risk percentages, assessing risk of disconnection emergency, blowouts and damage to the environment. Therefore, the DPO on board Offshore Units have to be familiar and know more and more about it, considering that systems are required. This system that provides redundancy for Dynamic Positioning providing take another reference system operated with different operating principle, thereby increasing the safety of the vessel, crew and environment. This paper presents the principles for risk analysis of DP operations, from deriving a specific DP failure frequency for the vessel, to establishing a case specific risk model. The principles of DP risk analysis are exemplified through selected case studies.