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In the mid-1990s, the US Navy’s technical community, led by Naval Sea Systems Command (NAVSEA), recognized existing coatings used to protect the inside of ships’ tanks were failing on average 5-8 years after application. The high cost to blast and recoat over 11,000 tanks every 5-8 years, not counting submarines and aircraft carriers, was prohibitive. To address this issue, the Navy conducted a study to analyze the problem and decided to replace these legacy coatings with high solid epoxy coatings.1
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Development of a ballast tank coating has its' challenges, providing a long term protective coating that can withstand the stress of operational life, whilst being applied in less than ideal conditions has always been the goal.
Improved holiday detection of new coatings in ballast tanks on Navy ships can increase the coating’s service life. This paper describes development of a fast, compact and portable holiday detector based on imaging of fluorescent coatings.
Feathering is the process of tapering or blending-in an existing intact coating in preparation of applying a new repair coating. This industry common practice is intended to ensure good adhesion of the repair coating to the legacy coating, and to provide a seamless aesthetic transition for areas where maintenance painting is performed. There are no industry standard requirements for performing feathering, resulting in most specifications having their own unique definition.
Improved holiday detection of new coatings can increase a coating’s service life. This paper describes development of a fast, compact and portable holiday detector based on imaging of fluorescent coatings that is designed for ballast tanks inspection on Navy ships.
The U.S. Navy spends tens of millions of dollars each year repairing failed coatings on its ships and submarines. The Naval Sea Systems Command (NAVSEA) and the National Surface Treatment Center (NST Center) have developed and implemented a process to assess preservation work being conducted by both public and commercial shipyards and the Navy’s Supervisor of Shipbuilding commands