A maiden survey conducted by the Unmanned aerial vehicle (UAV) and inspection firm Cyberhawk has completed the first full ABS Intermediate Hull Survey 4 on an oil tanker using UAVs.
Class inspection
The firm Cyberhawk performed full class inspection across 19 tanks on board an oil tanker while at a shipyard in Singapore. This included 12 Cargo Oil Tanks (COT), two slop tanks and five ballast tanks. Attending was the American Bureau for Shipping (ABS) to ensure the quality of the inspection complied with the specific ABS rules (ESP) set for tankers. The inspection also had to satisfy the US Coast Guard’s Critical Area Inspection Plan (CAIP) as the vessel was American flagged and operated in Alaskan waters.
Traditional survey methodology
The traditional method of inspection for this type of tanker would be to scaffold the inside of the tank and have ABS surveyors perform a visual survey and NDT technicians take thickness measurements. There are multiple liabilities associated with this type of working, from potential dropped objects caused by lowering equipment into the tank, to potential damage to the tank coating, to working at height in confined spaces.
Furthermore, the time required to set up and remove the scaffold, together with the time required for inspection, is roughly seven days per tank compared to one day per tank by Cyberhawk’s two-man team.
Rope access survey
Rope access is another possible alternative; however, the ABS surveyor would need to be rope access trained, or a live feed from the rope access technicians back to an ABS Surveyor on the tank top would be required. This methodology would require significantly longer inspection time compared with UAVs (approximately three times longer) and require an ABS surveyor to be available for the duration.
Even with the new efficiencies provided by UAV inspection, however, NDT technicians were still required to take thickness readings (at accessible levels) to meet the ABS survey requirements for this class of vessel. However, in summer 2018, Cyberhawk is due to conduct its first proof of concept on a UT solution from UAVs that would negate the need for scaffolding, rope access technicians or rafting solutions for this type of tanker survey.
iHawk virtual management software
The Cyberhawk team completed more than 350 flights and collected over 600GB of data. The data is being hosted in iHawk, Cyberhawk’s cloud-based visual asset management software, which has been designed to host the huge volumes of data captured by UAVs or other sources and allow the user to access this data in a functional and intuitive way.
iHawk is providing the client with a 360-degree view of the inside of the tanks, with defects and areas of interest highlighted. High definition imagery is provided which allows the user to see these points of interest in great detail, allowing them to make evidence-based asset management decisions.
iHawk is also providing the client with a complete visual record of the tank, which can be referred to on an ongoing basis to monitor the condition of the tank and the degradation of any defects.
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Source: Marine Link
