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Corrosion monitoring technology selection should be based on the challenges and information needs in each individual case. A combination of monitoring technologies will often provide the most reliable information, leading to improved decisions and better corrosion management.
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Assessing the corrosion degradation of aboveground tank bottom plates is a critical challenge for the industry. Internal inspections are a useful way of assessing the integrity of assets but might severely impact normal plant operation. In 2006, Chang et al. conducted a study on storage tank accidents and concluded that 74% of reported accidents occurred in petrochemical refineries, and 85% of them had caused fire and explosions.
Technologically advanced, fully-digital ultrasonic wall-thickness measurement systems coupled with Internet of Things (IoT) back-haul data communication schemes, including cellular, are enabling transportable,accurate and cost-effective corrosion-monitoring systems.
Over the past decades cost pressure in oil refining has increased, especially in Europe where the consumption of oil products is decreasing over time. Refineries are investigating ways to increase margin and, given that they account for around 80% of total refinery expenditure, reduction of crude oil cost is a key factor. One way of doing this is to purchase cheaper and generally less desirable crude from global markets.
The authors will demonstrate that deploying only a modest number of point measurement devices in an area of elevated localized corrosion risk will provide the best possible combination of probability of detection (POD) as well as ongoing wall thickness monitoring for localized corrosion attack.