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Thursday, September 2, 2021 

Mitsubishi Shipbuilding, a part of Mitsubishi Heavy Industries (MHI) Group, has been granted Approval in Principle (AiP) from French Classification Society Bureau Veritas (BV) for a cargo tank system to be mounted in a liquefied CO2 (LCO2) carrier.

MHI Group is pursuing a range of strategic measures to strengthen businesses related to energy transition, and believes that establishing a CO2 ecosystem is a key part of that effort. Further, CO2 capture, utilisation, and storage (CCUS) is attracting attention worldwide as an effective means to achieve decarbonisation. LCO2 carriers are expected to play a pivotal role in transporting CO2 from its emission sources to storage sites or facilities for utilization, and demand for these vessels is expected to increase in the future. Mitsubishi Shipbuilding is responding to this demand by actively pursuing development and commercialisation of LCO2 carriers.

LCO2 carriers transport liquefied CO2 gas as a liquid in a low temperature, high pressure state. Accordingly, independent Type C tanks as defined by the IGC Code are typically used for the cargo tank system. A structural design based on standards for pressure containers is required when using a Type C tank. There are various structural types for these tanks, including cylindrical, bi-lobed, and tri-lobed. A further important factor is to select a steel material for the LCO2 tanks with exceptional high strength and low temperature properties.

Looking ahead to the future, Mitsubishi Shipbuilding has previously conducted studies on CO2 carriers in 2004 as a participant in the International Energy Agency (IEA) Greenhouse R&D program, utilising advanced techniques for structural analysis, material evaluation, gas handling, and other experience accumulated from the construction of LPG and LNG carriers.

Going forward, with this acquisition of an AIP for the LCO2 cargo tank system, MHI Group says it will continue to develop and offer a wide range of technologies related to LCO2 carriers essential to building a CCUS value chain, and contribute to the realisation of a decarbonised society.

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