Jul 12, 2022 | Ship design & naval architecture news

Korean Register (KR) and Hyundai Heavy Industries (HHI) have conducted a joint development project (JDP) to develop 40,000m3 liquid Carbon dioxide (LCO2) carriers fuelled with LNG, which has resulted in KR issuing an approval in principle (AiP).

As a way of tackling global climate change, the ‘CO2 Capture, Transport, and Burial’ method has attracted attention as an intermediate step to achieving carbon neutrality. This has led to increased demand for technology for LCO2 carriers which can safely transport carbon dioxide captured in the supply chain. Transporting CO2 in a liquid state requires a pressure C-Type cargo tank capable of withstanding a high vapour pressure of over 5 atm or greater. However, this type of cargo tank is usually used for smaller carriers and there are technical difficulties in enlarging the size of the tank to meet the market need to transfer a larger amount of CO2 to storage facilities. In addition, the tanks and supporting structures of LCO2 carriers must be designed with the greatest care because of the high specific gravity of liquefied CO2.

Under the JDP, HHI carried out the basic and structural design of the 40K m3 LCO2 carrier, while KR verified the safety and conformity of the design reviewing the class rules and international conventions. One of the main aims of the project was to explore the economic feasibility of large pressure-type CO2 storage tanks. To increase the size of the CO2 storage tanks, special materials with low-temperature and high-tensile need to be used instead of ordinary steel, which makes it challenging to control the thickness and weight of the tanks.

The LCO2 carrier design which has been awarded AiP is capable of storing up to 40,000m3 using a type C pressure tank made of existing low-temperature and high-tensile materials. An LNG fuel propulsion system has been installed, ensuring low carbon emissions during the carrier’s operation. The safety of the carrier’s cargo hold, cargo tank and supporting structure has been verified and approved using KR’s SeaTrust-HullScan software solution which was developed in house.

A KR official said: “This AIP is a significant achievement, bringing the commercialization of large LCO2 carrier technology even closer. KR will continue to support the industry’s work to develop CO2 capture, storage and burial-related technologies, while proactively working to address the industry-wide challenge of decarbonisation.”

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