LNG fuelled engines
Liquefied natural gas (LNG) is becoming a popular fuel for ships, with Rolls-Royce a leading manufacturer of gas engines for propulsion and on board electric power generation.
Our Bergen lean-burn gas engines are the result of careful development based on more than 25 years' experience with the highly successful K-class gas engines.
This has ensured that Bergen gas engines are particularly robust, with a high degree of reliability and long intervals between overhaul. The lean-burn principle delivers high efficiency coupled with reduced exhaust emissions and low specific energy consumption.
Ongoing investment in lean-burn gas engine technologies led to the recent introduction of the Bergen C-series gas engines and the larger B-series in-line and BV-series V-engines based on the Company's lean-burn technology.
In the Bergen C26:33 series gas engines CO2 emissions are reduced by 22 per cent compared to engines burning liquid fuel, NOx emissions are cut by 92 per cent, while emissions of SOx and particulates are negligible. Engine design also cuts methane slip, seen as a disadvantage of gas engines, to very low levels.
The Bergen C26:33 has already obtained United States Environmental Protection Agency (EPA) Tier 3 certification and meets IMO Tier 3 regulations for both SOx and NOx. It also stands ready to meet, with minor modifications, the more restrictive U.S. EPA Tier 4 regulations when they come into force. This makes them an ideal choice where an environmentally 'future proof' propulsion system is required.
Currently our Bergen gas engines are in service or on order for, ferries, roro vessels, tankers, coastguard ships and offshore support vessels. Over 40 Bergen marine gas engines are either in service or are being installed in new vessels. On land about 500 Bergen gas engines have accumulated over 20 million running hours in power generation applications.
Today the compact and robust Bergen gas engine range is available for powers from 1,460 to 7,000kW. Power dense 6 and 9 cylinder in line engines for powers of 1,460 to 2,430kW and the low emissions Bergen B gas engines for powers of 3,780 to 7,000kW.
Following excellent experience with our Bergen LNG fuelled engines powering five double ended ferries in intensive service connecting main road routes on the west coast of Norway since 2007, a second generation and larger ferry has now been delivered to operator Fjord 1. The Boknafjord can carry 242 cars or equivalent, and 589 passengers. Three Bergen C26:33 nine cylinder gas engines drive generators that power four of our Azipull steerable thrusters to maximise the vessel's efficiency and manoeuvrability, while at the same time significantly reducing emissions.
The world's first pure gas powered cargo vessel, MS Høydal, purpose built to replenish the salmon and trout farms of Northern Norway, entered service with NSK shipping during 2012. The vessel features a range of our equipment including the energy efficient Promas systems integrated into a highly efficient ship powered by a single Bergen C26:33 six cylinder gas engine rated at 1,620kW, linked to other Rolls-Royce systems for optimum energy efficiency. As routine engine maintenance is limited to changing spark plugs and filters, savings in maintenance cost are already estimated to be between five and ten per cent annually.