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Power tool cleaning has been a common method of surface preparation prior to coating application since the dawn of steel shipbuilding. Power tools are usually handheld pneumatic, or sometimes electric, devices that through impacting or abrasive action can remove coating and corrosion. Most commonly power tool cleaning has been used for re-work or coating repair associated with outfitting. Typically, power tools are limited to the touch up or repair of small areas or areas that cannot be accessed by bulkier equipment such as abrasive blasters.
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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
The relationship between this sensitization and the microstructural features of Al 5083-H116, 5083-H131, 5083-H321, 5456-H116 aluminum alloys, such as grain boundary misorientation angle, dislocation densities, and β phase nucleation densities were examined and reviewed.
Corrosion is one of the leading maintenance costs across the United States Surface Navy, with approximately 25 cents of every dollar spent on maintenance going towards fighting or correcting corrosion. In addition to the huge financial burden, corrosion can limit the ability of our Navy’s ships to meet operational commitments and even prevent them from achieving their expected service life (ESL).
Focusing on the invention of new measurement methods in order to analyze hull coating efficiency more precisely is one approach. However, it is possible to treat performance data from in-situ observations carried out at specified intervals onboard any vessel (over 10,000 dwt) by means of a data collection protocol.
During military ship and offshore platform construction weight, International Maritime Organization (IMO) approvals, and VOC content are a prime consideration. There is a need of commercial products that can fulfill International Maritime Organization (IMO)/Safety of Life at Sea (SOLAS) and Qualified Product List (QPL) approvals, are lightweight, and contain no VOC, are environmentally friendly, and can be used for different applications
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.
Regulations limiting Volatile Organic Content (VOC) have led to increased interest in solvent-free epoxy coatings, but the use of these coatings can give significant performance advantages and not just environmental compliance.
General Dynamics NASSCO proved that by modernizing its facilities and changing its operations it could build ships similarly to the industry leaders in Asia.
The NSRP Surface Preparation & Coatings (SP&C) Panel 2018 Update
The National Shipbuilding Research Program (NSRP) is an industry-led, Navy-sponsored collaboration of U.S. shipyards working together to reduce the cost of building, operating and repairing Navy ships by improving productivity and quality through advanced technology and processes. In 2014 the NSRP Surface Preparation & Coatings Panel obtained approval from the Executive Control Board for funding of a project that would evaluate the latest in digital coating inspection instruments and their potential for cost savings in the inspection of Navy vessels.