DSME and DNV GL partner for efficient LNG carrier design

At the Gastech 2017 conference in Tokyo, Japan, DSME, a leading company within commercial ship building and LNG carrier technology, and DNV GL, the world’s leading classification society, presented the results of a joint development project (JDP) for the design of an innovative, efficient LNG carrier based on today’s technology. The project focused on delivering a design which an owner can take straight to the yard and is ready for upcoming market trends and incoming regulations, with an optimal size, hull form, and machinery and electrical systems.

“When we look at today’s LNG market we predict that in the years to come we will see the rise of post-Panamax LNG carrier designs which are dimensioned to fit of the new Panama Canal. Capacities of over 175,000 m3 are feasible given the new restrictions,” says Johan Petter Tutturen, DNV GL – Maritime Business Director Gas Carriers.

An important consideration for the design is the shift towards lower, more energy-efficient transit speeds. The hull and propulsion system have been optimized for three different operating profiles on a standard transpacific route (19.5, 16 and 12 knots). Calm water optimization resulted in gains of 6%, 2% and 5% over the reference design at each of the three operating profiles. The optimization calculations were performed using the DNV GL hydrodynamic analysis software Wasim as well as statistics and Reynolds-averaged Navier-Stokes (RANS) simulations for determining wave resistance.

The design uses direct-coupled, two-stroke dual-fuel (DF) main engines and DF auxiliary engines, with LNG as the primary fuel. A combined gas turbine, electric and steam (COGES) propulsion system was chosen for the optimized machinery.

For the portion of the boil-off gas used as LNG fuel a “High Manganese Steel Cargo Tank Independent Type B” was chosen and underwent closed mock-up testing using liquid nitrogen (LN2). This was selected for its excellent tensile properties, high performance and product capacity at low cost, and allows flexible tank shapes while being slosh-free without imposing any filling limitations.

The design also incorporates DSME’s SloT® (Ship Internet of Things) technology and their wireless computer network and integration system Smartship 4.0. In addition, the entire on-board computer environment underwent thorough testing to improve its cybersecurity.

About DSME

Started in 1973 at Okpo Bay, Geoje Island, located on the southeastern tip of the Korean Peninsula, the shipyard of DSME was completed in 1981. DSME has since grown into the world's premium shipbuilding and offshore contractor who is specialized in building various vessels, offshore platforms, drilling rigs, FPSO/FPUs, submarines, and destroyers.

The shipyard which spans an area of 4.3 million meters squared encompasses the world's largest dock with a million-ton capacity and is optimized for building high-tech motor vessels using cutting-edge equipment, including a 900-ton goliath crane.

DSME manufactures high-quality products based on its vast IT expertise, well-managed shipbuilding technologies, superb fixed-platform construction capacities, large-scale project management know-how, and submarine/destroyer construction technologies.