First CNG Carrier Ready for Construction to ABS Class

Tuesday, September 19, 2006
ABS has given full design approval for the class of the compressed natural gas (CNG) carrier designed and developed by Canadian-based Sea NG Corporation. Full approval follows the earlier Approval in Principle (AIP) issued by ABS for the Sea NG design in 1997 and is the first full class approval for a CNG carrier issued by the Bureau.

Sea NG is expected to award construction of three Coselle CNG carriers later this year. These first vessels are intended to service projects in the Caribbean or Mediterranean Seas. The vessel's design has been approved to the standards established in the ABS Guide for Vessels Intended to Carry Compressed Natural Gases in Bulk as well as applicable parts of the ABS Steel Vessel Rules. Once constructed and accepted into class by ABS the vessels will carry the notation CNG Carriers. Sea NG uses its proprietary Coselle system for storing and transporting CNG. This patented system uses small diameter high-strength steel pipe coiled into a carousel to store the high-pressure natural gas. The carousel provides support and protection for the pipe and facilitates transport and stacking of the Coselles within the ship. Each Coselle will comprise approximately 10 miles of 6-inch diameter pipe.

These Sea NG vessels will be 120m in length and have the capacity to carry 50 million standard cubic feet of gas (MMSCF) in 16 Coselles (160 miles of pipe in total). The 16 Coselles are arranged in four stacks of four high in a fully enclosed and inerted cargo house on the weather deck. The vessels will feature a dual fuel propulsion system with bow thruster. The Sea NG vessels also feature a proprietary high and low pressure manifold system for efficient loading and unloading of the natural gas.


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