Norwegian designer Brevik Technology has received approval in principle (AIP) from classification services provider American Bureau of Shipping (ABS) for its new gas containment system concept.

With this approval, Brevik can use the cylindrical tank concept that includes a series of independent, cylindrical IMO Type-B tanks for gas carriers of 30,000m³.

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ABS corporate technology containment system group head Yung Shin said: "ABS has completed more than a dozen assessments on new concepts in gas containment in recent years.

"Our focus during the AIP process was on assessing the system’s compliance with the intent of ABS rules and other applicable standards."

"Our focus during the AIP process was on assessing the system’s compliance with the intent of ABS rules and other applicable standards, including strength of the tank, its support structure and its interaction with the hull."

ABS evaluated the gas containment system against the requirements of the International Gas Code, ABS Rules and the ABS Guide for Liquefied Gas Carriers with Independent Tanks.

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The concept is designed to reduce construction costs for LNG and LPG carriers.

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Brevik is currently in talks with shipowners and yards for a vessel design concept, including the Type B tank.

Brevik Vard Engineering managing director Øystein Kristoffersen Sæther said: "In creating the design, it was emphasised that no thermal induced forces were transferred from the ship to the tank and vice-versa due to temperature variations.

"The use of a cylindrical tank also means that the potential for damage from sloshing is low."

Upon completion of a vessel’s detailed design, Brevik is expected to receive a general design approval. A vessel-specific shipbuilding project will see Brevik receiving final approval.