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Marine Log

Coselle CNG ship

September 20, 2006

Coselle CNG tanker gets full ABS approval

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 ABS.

The ships have been designed jointly by Sea NG and Seattle-based naval architectural consultancy Guido Perla and Associates, Inc.

Along with developing the hull form and observing scale model testing, GPA was responsible for the stability, structural design, ship systems and life Safety Systems and for obtaining ABS approval for the vessel design.

Sea NG is expected to award construction of three of these CNG carriers later this year. These first vessels are intended to service projects in the Caribbean or Mediterranean Seas.

"We are pleased to bring innovation to the marine gas transportation market by offering a new ship-based gas delivery system that is safe, reliable and economic," said Dave Stenning, President & CEO of Sea NG.

The vessels' 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 "A1 CNG Carrier".

Coselle CNG storage system

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 120 m 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.

"Today, our company is continuing to lead the field of naval architects for innovative design and construction of next-generation vessels to serve the world's oil and gas markets", said Guido Perla.

Along with developing the hull form and observing scale model testing, GPA was responsible for the stability, structural design, ship systems and life Safety Systems and for obtaining ABS approval for the vessel design.

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