LNG tank depot on board the new container ship Hapag (DSME)

Posted on November 1, 2022 at 8:17 p.m. by

The Maritime Executive

Construction of the next generation of ultra-large container ships from Hapag-Lloyd continues at Daewoo Shipbuilding & Marine Engineering in South Korea. The yard is reporting key milestones for the new 23,660 TEU container ships, including the first-ever installation of a high manganese steel LNG tank on a dual-fuel container ship.

DSME previously said it spent a decade developing the steel tank concept with South Korean steel company POSCO. Tank design is seen as a significant challenge for French GTT which has dominated the market. DSME points out that these tanks are traditionally made of materials such as aluminum or stainless steel to withstand the cryogenic conditions (-163?) of liquefied natural gas. However, the materials are expensive, difficult to manufacture, and require adjustment of the production schedule due to the load exposed and the influence of external environments such as weather conditions.

The new steel tank design they report can overcome these shortcomings. It has a lower price than conventional materials and has high strength and wear resistance as well as good performance at cryogenic temperatures. The first installation was completed in June 2022 with IMO Type-C LNG fuel tanks mounted on the deck of a Very Large Crude Oil Carrier (VLCC). A second VLCC was also fitted with the new tank design.

The first square high manganese steel Type B LNG tank was recently loaded into the hull of the new Hamburg Express construction of ships for Hapag-Lloyd. It was the latest progress in the construction of the first of six new container ships.

Engine lowered by floating crane as construction progresses (Hapag)

In September, DSME laid the vessel’s keel and recently placed the main engine in the hull. Using a floating crane, the 2,246 ton MAN ME-GI engine was deployed. According to Hapag, the new LNG-powered main engine has a maximum output of 58,270 kW at 76.5 rpm. Assembly and alignment of the shaft was expected to take the next three months as DSME completes construction of key components of the propulsion system.

New Hamburg Express is reported to be 1,312 feet long and will be among the largest container ships in the world based on capacity. Delivery is scheduled by the end of April 2023 to be followed by the sister ships. The last of the class will be delivered before the end of 2024.