Korean shipbuilder DSME, a company with international expertise in LNG carrier technology, and classification society DNV GL have presented the results of a joint development project (JDP) at Gastech 2017 for the design of an innovative, efficient LNG carrier based on today’s technology. They propose that such a design will incorporate LNG as the primary fuel.
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 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 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.
(Source: DNV GL – Maritime)