The Monitas System for the Glas Dowr FPSO

The paper is one of five papers about the Advisory Monitoring System (AMS) for controlling the fatigue lifetime consumption of FPSO hulls. The system has been developed within the Monitas Joint Industry Project (JIP) and is referred to as the Monitas system. The name Monitas stands for Monitoring Advisory System. The paper describes the Monitas system developed, installed and running for two years on-board the Glas Dowr FPSO operated by Bluewater Energy Services (BES) at the Sable field, offshore South Africa. The paper describes how the Monitas system advises on fatigue lifetime consumption based on the fatigue design data, fatigue design tool and the monitoring data of hull girder loads, global and local stresses, wave frequency motions, ship's loading condition and heading, and the environmental conditions. The paper concludes that contrary to conventional structural health monitoring systems, estimating the actual fatigue lifetime consumption, the Monitas system can explain potential deviations from the design assumptions. In this way the Monitas system provides designers with feedback about the quality of their design tools and made assumptions, and advises the FPSO operators on actions required to ensure a safe operation and, if needed, can be used to justify lifetime extension.

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