Published on February 19, 2014
LNG fuelled Container Vessel Nitin Sharma XXXV Batch
Why LNG as fuel ?
SO2 emission scenario of the world
MARPOL (Annex VI) • Limits the sulphur content of marine fuels on a global basis to 4.5%. (May 2005) • That limit was then lowered to 3.5% sulphur from January 2012. • Annex VI also imposed a 1.5% sulphur limit on marine fuels in Emission Control Areas (ECAs) effective May 2006. • That limit was reduced to 1.0% sulphur effective 1 July 2010, and will be further reduced to 0.1% sulphur beginning January 2015.
Current World Scenario:
Benefits Of LNG as Fuel • LNG is expected to be less costly than marine gas oil (MGO).
Benefits Of LNG as Fuel • The use of LNG as ship fuel will reduce sulphur oxide (SOx) emissions by 90-95%. •A lower carbon content of LNG compared to traditional ship fuels enables a 20-25% reduction of carbon dioxide (CO2) emissions.
LNG as fuel Till date: • Dual • As • In fuelled ships. fuel in converted ships. LNG carriers.
Why for Container Ships ?
Why for Container Ships ?
LNG as Fuel for Container Ships Payback time is shorter for the smaller container vessels (900 TEU and 1,250 TEU) since the capital investment needed for their LNG systems is smaller than for larger vessels.
Storage of LNG as Fuel: • Issues related: • Highly Pressurised • Low Temperature • Insulation: Thermal & Chemical. • Use of special valves for bunkering & release of fuel
Stowage Of LNG fuel in a Container Ship • Very difficult to stow in double bottom tanks. • Two methods: Using ISO type ‘C’ tanks installed at stern. • Using ISO LNG Containers 20/40 TEU. •
ISO Type C Tanks at the Aft of ship.
Advantages of this setup: • Most suitable for easy & fast bunkering of fuel. • Trim by aft. • Easy maintenance & cleaning of tanks. • Initial cost of the setup is high.
ISO LNG Containers (20/40 TEU)
Features of this system • Flexible: Containers can be added as per the requirements of the route (distance). • Easy loading of fuel. • Use of special valves and pipe connections required on the deck to supply fuel to engine room. • Low cost of the setup.
Stowage Of LNG fuel in a Container Ship
No. of LNG containers required: • SFC: 65.45 gm/kW h • MCR: 8400 kW h • No. of days at 19.5 knots: • Distance: • Mass of LNG needed: 52 t • After allowance: • 60 t of LNG = 133.3 m3. • Capacity of 1 LNG TEU = 20 m3 • No. of container needed = 7 • No. of Container carried on ship: 8 or (4 FEU). 4 days 1880 nm (Fueling at origin, Low cost) 60 t
Scope • First ship on this concept to be launched in mid this year. • 12 ships have been ordered by TOTE Maritime (US) to a Norwegian Shipyard. • LNG bunkering facilities are being developed at several shipyards in European Union. • Many owners from European countries have also shown their interest.
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