Delivering the World's First Multi-Robot Toolkit for Special Survey Inspection of FPSO Hull Tanks

Abstract This paper presents the groundbreaking development and deployment of a fully robotic method for special surveys, utilizing the innovative iCOT remotely operated underwater vehicle equipped and integrated with advanced non-destructive testing (NDT) capabilities and the state-of-the-art Scout137 drone system equipped with an ultrasonic probe and specialized mapping software. This project marks a significant milestone as it achieved the world's first classification society ("Class") approval for such a method which eliminated the need for confined space entry. This achievement was the result of progressive development stages, extensive testing, and operational improvements undertaken by a global team. The development of the iCOT system brought a novel solution to the industry that delivered comprehensive hull tank inspections, setting new benchmarks for establishing the structural integrity of the hull and its internal structures, while maintaining the probability of detection for threats such as coating and corrosion damage, crack and deformation. To compliment the iCOT system a Scout 137 drone, a remotely piloted aircraft fitted with advanced perception systems and an ultrasonic probe, was deployed, flying beyond visual line of sight, as part of the cargo oil tank inspections on a ‘live’ facility. This paper discusses how the multi-robot strategy that combined both the iCOT remotely operated vehicle (ROV) and novel drone technology to establish a capability which offers an alternative to manual entry into confined spaces. The results of the first offshore trial of this system shall be presented, highlighting the learnings and major advantages witnessed versus personnel entry. The paper shall discuss the next steps for the system's evolution. This collaborative effort not only enhanced the efficiency and safety of class surveys but also set a new standard in the industry for the adoption of robotics and advanced non-destructive testing techniques.