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Classification society ClassNK has issued an approval in principle (AIP) for a 7,500-cubic-metre (cbm) LNG bunkering vessel designed by Hanjin Heavy Industries & Construction Co., Ltd. (HHIC). The AIP was granted after confirming the design complies with ClassNK's Rules and Guidance for the Survey and Construction of Steel Ships.

The design, which includes type-C bi-lobe tanks to improve cargo capacity, efficiency and productivity, is the result of joint research carried out by HHIC and ClassNK to improve the efficiency of LNG bunkering vessels.

The AIP allows the design to be considered for further individual projects, where tests on the hull structure scantling and direct stress analyses will be carried out to ensure the structural integrity of each specific design is in line with class rules and the International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code).

Commenting on the AIP, Takashi Nishibashi, ClassNK's Country Manager of Korea, said: "Hanjin Heavy Industries & Construction Co., Ltd. and ClassNK have always enjoyed close cooperation, and this design is just one of the fruits of our relationship. We hope this AIP will help pave the way for a new generation of highly efficient LNG bunkering vessels."

Cha-Soo Lee, Technical Director of HHIC, remarked: "When we are commissioned to develop an LNG bunkering vessel concept by clients we face a much wider array of challenges, such as compact ship's dimensions, robust hull structure, more cargo capacity, simple operation and lower ship's price etc. We are happy to find the best compromise between economic and technical issues through this joint research with ClassNK."