Nor Lines orders two LNG cargo vessels

By Keith Henderson at October 04, 2011 07:56
Filed Under: General

Nor Lines the Norwegian logistics and shipping company has ordered two liquefied natural gas (LNG) fueled cargo vessels of 5,000 dwt at Tsuji Heavy Industries (Jiangsu) Shipyard, China. Delivery of the new ships is expected in October 2013 and January 2014.Nor Lines also have an option on two further vessels of the same class.

The ship is a Rolls-Royce Marine design for a mixed cargo vessel of a maximum of 130 TEU containers, up to 40 trucks, and a cargo capacity of approximately 2,000 tons of frozen or dry cargo on pallets. The design follows an Environmental Ship Concept (Environship) presented at the this year’s Nor-Shipping Exhibition and Conference and winning the Next Generation Award.

Caption: Cutaway drawing of the Nor Lines LNG fueled cargo vessel showing LNG tank,
engine location and Promas propulsion system.
Image Credit: Rolls-Royce Marine

The vessel has an LOA of 394 ft (120 m), beam 68 ft (20.8 m) and maximum draft of 19.6 ft (6 m). A single Rolls-Royce Bergen LNG propulsion engine is used as, compared to other brands the Bergen has spark ignition and operates solely on LNG and does not require pilot injection of liquid diesel fuel. The engine specified is a Bergen B Series lean burn gas engine type B35:40 V12 developing 3,930 kW (5,268 hp) at 750 rpm. According to Rolls-Royce, the engine can operate at variable load and speed, while maintaining a high thermal efficiency down to low part loads. A cruising speed of 15kn is provided by a Promas propulsion system with integrated CPP and rudder which claims an efficiency improvement of up to eight per cent.

The LNG fuel tank has a 14,125 cubic ft (400 m3) capacity offering a range of about 3,400 nautical miles. There is a 13,000 US gall (50 m3) MDO fuel tank to supply two auxiliary 700 kW gensets. A Hybrid Shaft Generator (HSG)system is specified which can provide electrical power at the correct voltage and frequency down to very low engine speeds, reducing the need to run auxiliary gensets. The shaft generator can also operate as a power take-in motor thereby providing redundancy for the propulsion system.

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