| one publication added to basket [284339] | Monitoring as a tool to continuously assess the state of health of metallic structures in marine conditions
Van Ingelgem, Y. (2017). Monitoring as a tool to continuously assess the state of health of metallic structures in marine conditions, in: International Symposium on Corrosion and Fouling. Two natural curses for a ship's hull. Antwerp Maritime Academy 3 April 2017. pp. 4-5 In: (2017). International Symposium on Corrosion and Fouling. Two natural curses for a ship's hull. Antwerp Maritime Academy 3 April 2017. Antwerp Maritime Academy: Antwerpen. 30 pp., more |  |
| Available in | Author | | Document type: Summary
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| Keywords | Chemical reactions > Corrosion
Monitoring
Marine/Coastal |
| Abstract | Ships tend to spend most of their operational life in challenging marine conditions. Other than for fixed structures the environment they reside in as well as the loads they are subjected to can vary significantly over the full operational life. This means that, in order to track the true 'state of health' of a ship in time one cannot only rely on design assumptions: a thorough follow-up based on continuous sensor readings turns out to be the way to go in optimal structural health management.When on a trip as well as when in port ships are subjected to various kinds of loads: Periodic mechanical loads through waves, currents, wind as well as rotating equipment Extreme mechanical loads in case of storms or collisions Corrosive loads that vary in time with location, temperature, state of health of the coating Abrasive loads in case of special cargo such as bulk goods or in the dredging industry Various kinds of fouling These in turn have a significant influence on the ship's availability and performance, thus on the economical value to be gained from operating it. Unexpected or excessive degradation can lead to unplanned downtime. Cracks or leaks can lead to spills or even loss of the ship. Excessive abrasion leads to increased replacement costs and fouling results in increased fuel consumption and reduced cooling/heating capacity.The good thing however is that all of these phenomena can be followed nowadays using a well-chosen combination of sensors. Mechanical loads and deformations, including fatigue, can be tracked using accelerometers and strain gauges. Corrosion activity can be followed using ER probes, coupons or PermaZen technology. Fouling can be made visible by specific sensors as well or tracked from derived parameters such as heat transfer coefficients. Finally, all of these are coupled with operational parameters such as temperatures, speed, fuel consumption, metocean conditions, position, ...In order to avoid downtime, minimize fuel consumption and have a maximal return on investment (ROI) it is paramount to be able to predict failure in order to allow for cost-effective maintenance. Based on modern-day big data techniques together with solid physics and a number of the listed (novel) sensoring techniques such can be achieved through continuous monitoring. Additional benefits include the ability to determine the real age of the vessel compared to the design life set forward, leading to an improved and quantitative decommissioning strategy. Furthermore, the knowledge obtained in a solid integrity monitoring program is ready to be implemented in future generations of ships that will in turn be gifted with a more extended operational life. The presentation will provide an overview of the available sensor techniques and how these can be combined into an efficient monitoring tool for the state of health of an operational vessel. |
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