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 52 Proceedings Winter 2013–2014 based on the guidelines of the International Maritime Organization to provide a fexible and comprehensive design and review framework for the commercial indus- try. Additional policy guidance regarding LNG-specifc bunkering facilities, tank barges, security, and training will soon be publicized. The Coast Guard, class soci- eties, and the marine industry are cooperating closely to ensure that the safety issues inherent in the design and operation of a highly fammable and cryogenic ship- board technology are properly addressed. One appropriate LNG fuel candidate is the offshore sup- ply vessel or OSV. This vessel is the Swiss Army knife of the Gulf, because it is designed to perform the missions of multiple specialized ships using a single, versatile platform. A given multipurpose OSV may be engaged in bulk liquid cargo transfer one day, anchor handling for a rig the next, and then proceed to transport workers to shore, before loading drilling mud and supplies to be taken back offshore. These activities and the multitude of others that OSVs must complete are usually energy- intensive, requiring high engine output and commensu- rate fuel consumption. Emission Limits Most domestic outer continental shelf resource exploita- tion takes place within the designated North American Emission Control Area (ECA), which extends 200 miles from land. Furthermore, of all U.S.-fagged OSVs listed in the Coast Guard's vessel database, the majority were constructed within the past 13 years. 1 This means that at least half of the feet is subject to the newer Tier I or Tier II nitrogen oxide (NOx) emissions limits. With strict Tier III standards only a couple of years away for all ves- With stricter vessel air emissions requirements com- ing into force in the Gulf of Mexico, the search for cost- effective compliance is intensifying, and many offshore support feet owners and operators are considering liq- uefed natural gas (LNG) as a marine fuel. The Coast Guard has responded to these developments by working closely with companies and evaluating design proposals in which LNG is planned for ship propulsion. Further- more, the Coast Guard has published domestic policy E m e r g i n g I s s u e s Greening the Fleet The maritime industry considers liquefed natural gas as a marine fuel. by LT BRYSON JACOBS Fire Protection Engineer U.S. Coast Guard Marine Safety Center An OSV supplies well stimulation chemicals to a platform approximately 160 nautical miles east of Corpus Christi, Texas. U.S. Coast Guard photos and graphics by LT Bryson Jacobs unless noted otherwise. Winter �2013_45.indd 52 2/10/14 9:31 AM