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BP Shipping> Gem class To the untrained eye, there is nothing obviously ‘different’ about the sleek new liquefied natural gas (LNG) carrier that glides its way serenely, but with purpose, through the Suez Canal. Just a quick chat with the experts is all you need, however, to realise that British Diamond, along with its slightly older sisters in the new ‘Gem’ class fleet – British Emerald, British Ruby and British Sapphire – represents nothing short of a revolution in the way gas is transported around the globe. There’s the way the ships are powered for a start. Gone are the conventional single steam turbines, to be replaced by a dual-fuel diesel-electric (DFDE) system that uses a power station concept. This increases fuel efficiency and so reduces costs and greenhouse gas emissions. The technology comprises four diesel generators and two electric motors geared to one propeller, with the diesel engines capable of running on ‘boil-off’ gases from the LNG cargo tanks, or on conventional diesel fuel. “Each ship consumes around 40 tonnes per day less fuel than a traditional LNG carrier of a similar size, even though it is carrying more cargo,” explains Adrian Howard, vice president for assurance. “That equates to daily savings of up to $25,000 per ship.” Annual emissions savings are around 36,000 tonnes of carbon dioxide and 1,700 tonnes of sulphur oxides. ‘Clean seas’ is one of the core values for BP Shipping (BPS). It is a noble ambition, but not one that is always easy to achieve when dealing with shipbuilders who seek to optimise yard and construction efficiency in a competitive market and, therefore, focus on low cost, standardisation of design and speed of construction, rather than the longer-term environmental impact and increased efficiency. » 30 Issue 1 2009 BP MAGAZINE “Each ship consumes around 40 tonnes per day less fuel than a traditional LNG carrier of a similar size, even though it is carrying more cargo. That equates to daily savings of up to $25,000 per ship.” Adrian Howard
Facts and figures Watchful eye: chief officer Peter Hackett watches over the bow as tugs tow the British Ruby carefully out of the port of Sagunto. Per vessel specifications of BP’s new ‘Gem’ class of LNG-carrying ships: Length 288 metres (944 feet) Width 44.2 metres (145 feet) Draft 11.47 metres (38 feet) Deadweight 76,000 tonnes Gross tonnage 99,600 tonnes Cargo capacity 155,000 cubic metres Service speed 20 knots Main engines Two 12-cylinder Wartsila 50DF (1,400kW) plus two 9cylinder Wartsila inline 50DF (8,550kW) – all at 514rpm. Generators Two Converteam 6.6kV (10,313kVA) plus two Converteam 6.6kV (13,750kVA) 14-pole salient machines Shipowner BP Shipping Shipbuilder Hyundai Heavy Industries Flagged Isle of Man BP MAGAZINE Issue 1 2009 31
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Page 33 and 34: BP Shipping> Gem class All hands: A
Page 35 and 36: Doing the rounds: chief officers Pe
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Page 47 and 48: order to prepare for the anticipate
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Page 67: The next edition of BP Magazine wil

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