gas turbines
enable larger payloads to be handled or life-cycle cost savings to be realised.
Engines for the SSC development programme are due for delivery to Textron in 2015, with the first test craft beginning trials in 2017 and becoming operational in 2020. Rolls-Royce believes the MT7 gas turbine to be well suited to other naval applications; diverse system configurations for either mechanical or electrical drives promise higher flexibility in propulsion system layout. US Navy
demand for Rolls-Royce gas
turbine-powered gensets is primed to continue with Department of Defence commitments to additional DDG51-class destroyers, which have already logged the longest production run for any US Navy surface combatant. The 200th AG9140 genset was installed last year on USS John Finn, the 63rd ship in the Arleigh Burke (DDG51) series. Each vessel features three 3,000kW sets to supply all electrical power for hotel services and combat equipment. The sets are driven by 501- K34 gas turbines, derived from the T56 engine that powers C130 Hercules transport aircraft. AG9140 gensets are also in service with
the Republic of Korea Navy’s latest KDX-III destroyers. The first of these sets were built and tested at
the Rolls-Royce Indianapolis
facility in the USA, the others supplied as kits for assembly and testing by Samsung Techwin in South Korea. Similar gensets are serving with the navies of Spain and Greece and with Japan’s Maritime Self-Defence Agency. Development of the AG9140 resulted in an RF variant. The R indicates a redundant independent mechanical start system, enabling a dark-ship start from batteries only (a built-in mechanical starter uses a small Rolls-Royce model 250-KS4 engine); the F indicates full authority digital controls for the engine/genset systems.
More powerful RR4500 gas turbine- generator sets rated at 4,000kW are specified for the US Navy’s new DDG 1000 Zumwalt- class destroyers, for each of which Rolls-Royce
Rolls-Royce MT30 turbines are specified for major Royal Navy and US Navy warships
will supply two such auxiliary gensets and two 36MW main generators powered by its MT30 gas turbines.
A versatile range of power options will be offered by this integrated all-electric machinery
for propulsion and onboard
systems: the MT30-based sets providing the bulk of the power and the RR4500 sets securing economy during light load conditions and peaking power when needed. The DDG 1000 design, harnessing
approximately ten times the electrical power of a DDG 51 destroyer, marks the first application by the US Navy of a large gas turbine for driving a generator set.
MT30 engines – the world’s most powerful marine gas turbines – are also powering US Navy Littoral Combat Ships (LCS) and will drive the UK Royal Navy’s two Queen Elizabeth-class aircraft carriers. The Royal Navy’s projected Type- 26 global combat ships will also feature an MT30
turbine as part of a CODELOG configuration. GE Marine’s continuing commitments
include LM2500 gas turbines for the US Navy’s Austal-built LCS programme, headed into service in 2010 by the 127m-long aluminium- hulled trimaran USS Independence. Twin 22MW sets are incorporated in a CODAG propulsion configuration partnered by MTU Series 8000 high speed diesel engines.
A marine sector debut for GE’s LM2500+G4 turbine was earned from the Italian and French Navies’ FREMM frigate programme, a series due for launching one per year from 2013 through to 2022. Benefiting from refinements from the latest generation of commercial and military aircraft engines, the +G4 derivative yields 17 per cent more power and a 6 per cent higher air flow than the LM2500+ generation. Adding to its US Navy references – over 700 sets have been delivered
combatants – the LM2500 is booked to power GE’s LM500 to power Korean patrol boats
GE’s smallest marine gas turbine, the aero-derived LM500, continues to earn references from naval patrol boats, the latest projects including the Republic of Korea Navy’s PKX-B programme. The gas turbines for the projected 34-ship series will be manufactured in Korea by Samsung Techwin at its Changwon facility, the first production phase covering 16 shipsets. PKX-B patrol boats will feature LM500 turbines with ratings of around 4,425kW in a CODAG plant.
46 I Marine Propulsion I April/May 2014 Capabilities have been established
by GE in Korea to support the LM2500 and LM500 gas turbine requirements of the ROK Navy. The US group expects, through Samsung Techwin, to supply more than 100 LM500 engines for the earlier PKX-A and the new PKX-B programmes. Samsung Techwin locally manufactures selected parts and assembles and tests the completed engines. GE provides support to its Korean partner for the gas turbine, control and
reduction gear systems as well as to the shipbuilder Hanjin Heavy Industries and Construction and the ROK Navy throughout installation, sea trials and commissioning. Derived from GE’s TF34/CF34 turbofan
aircraft engines, the LM500 has 90 per cent commonality with the CF34 which powers the popular CRJ100/200 regional jet. The simple- cycle two-shaft LM500 design with cold end- drive capabilities is based on a gas generator and free power turbine; a 14-stage axial flow compressor yields a pressure ratio of 14.5:1.
www.mpropulsion.com
for surface
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