Continuous Classification Strategy For Offshore Units To Improve Survey Methods And Asset Planning

Abstract

An assessment of Continuous Classification programs of some drilling/production companies was performed using two case studies: Drilling rigs and Floating Production Units (FPUs). Similar assessment was also carried out on one of the biggest Classification Society operating in the NCS in order to gain further insights into the current classing practices of these oil and gas companies with respect to the regulatory requirements of the Society. All assessments were done through questionnaires. The results obtained from interviews conducted indicate that among other things, standing offshore units are mostly required to go to dry-docks for renewal surveys every five years whereas, this is not the case for ship-shaped units. Robustness in stability and buoyancy offered by the hull of the latter compared to the former is the observed to the reason for this. Also, drilling equipment appears to be one of the most challenging IMR activity for drilling rigs, while for FPUs, cargo tank surveys are the most challenging activities. The prospects of exploring and deploying new inspection and maintenance technologies were also looked at and the use of UAVs, AUVs and Condition monitoring were the most prominent technologies being considered and implemented among the different companies. Finally, a digital class application is proposed to assist in planning and managing continuous classing activities.