Proceedings magazine is a communication tool for the Coast Guard's Marine Safety & Security Council. Each quarterly magazine focuses on a specific theme of interest to the marine industry.
Issue link: http://uscgproceedings.epubxp.com/i/264352
www.uscg.mil/proceedings 56 Proceedings Winter 2013–2014 An ABS surveyor inspects a gas valve unit. U.S. Coast Guard photo by LT Chris Nichols. As liquefed natural gas (LNG) gains popularity as an alternative fuel to meet today's tougher global marine emission standards, one company is working to employ the technology onboard U.S.-flagged offshore supply vessels as part of its "Going Green" initiative. The vessel design incorporates American Bureau of Ship- ping (ABS) ENVIRO+ and Green Passport standards 1 and features dual-fuel engines that meet EPA Tier II/ Tier III emission standards that are estimated to reduce nitrogen oxide emissions by 85 percent, reduce CO 2 emissions, and eliminate sulphur oxide emissions. 2 In addition to the environmental benefits, LNG-fuel technology also brings economic advantages. As gov- ernment regulations continue to demand cleaner emis- sions, low sulphur fuel oil is becoming scarce, and the price continues to rise. LNG offers an economically advantageous fuel alternative. 3 Regulatory Oversight Offshore supply vessels are being constructed within the framework of the U.S. Coast Guard's Alternative Compliance Program, which dele- gates primary certifcation authority to the ABS with Coast Guard oversight. However, due to the novelty of LNG-fueled vessels within the U.S. feet, the Coast Guard has retained plan approval authority and primary inspection oversight over the vessel's LNG components and systems. 4 Since the Coast Guard does not have formally adopted regulations for LNG-fueled vessels, this project poses some unique regulatory challenges. Additionally, we anticipate that these vessels will become more mainstream in the U.S. market, so the USCG Offce of Design and Engineering Standards developed draft design criteria for natural gas fuel systems E m e r g i n g I s s u e s Offshore Supply Vessels Going Green A progress report. by LT CHRIS NICHOLS Marine Inspector U.S. Coast Guard Activities Europe LT JENNIFER DOHERTY U.S. Coast Guard Marine Safety Engineering Program MR. MICHAEL CARROLL Harvey Gulf International Marine LLC Winter �2013_45.indd 56 2/10/14 9:32 AM