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GEM class

The British Ruby sailing at sea

British Ruby

These ships can carry a cargo of 155,000 cubic metres of liquefied natural gas (LNG). These vessels are equipped with a dual-fuel diesel-electric (DFDE) propulsion system that increases their fuel efficiency and reduces fuel costs

The dual-fuel technology allows the diesel engines to run on "boil-off" gases from the cargo tanks or on conventional diesel fuel, consuming about 40 tonnes per day less fuel than an LNGC of similar size with a conventional steam turbine propulsion system. Four diesel-electric engines provide greater propulsion redundancy and a bow thruster assists mooring operations.


The builder of these ships is Hyundai Heavy Industries Limited in Korea. They are British-flagged, with Douglas, Isle of Man as their port of registry. Their classification society is Lloyds Register. BP operates these ships, providing its own crews.

288.4 metres 
44.2 metres 
12.2 metres 
84,303 tonnes 
Top speed
20 knots 
Cargo capacity
151,945 M3 



  • Type: Liquefied Natural Gas Carrier (LNGC)
  • Hull: Double hull
  • Crew: Typically totals about 29 officers and ratings
  • Class: BP GEM class
  • Propulsion: Dual-fuel diesel-electric (DFDE) engines/single propeller
  • Cargo type: Liquefied natural gas (LNG)




  • Operator: BP Shipping Limited
  • Classification society: Lloyds Register
  • Builder: Hyundai Heavy Industries Limited (Korea)
  • Vessels in fleet: British Emerald, British Ruby, British Sapphire and British Diamond 




  • Flag: British
  • Port of registry: Douglas, Isle of Man
  • Operates: Worldwide

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