Feature 2
MAN breaks through with dual fuel
option
A unique in-line engine combination marks MAN Diesel’s first success in
supplying dual fuel four-stroke engines to the LNG carrier market.
A
174,000m
3
capacity liquefied
natural gas carrier to be
delivered by STX Shipbuilding New two-stroke selected
to Spanish owner Empresa Naviera
Elcano by mid-2010 will be the first
ship of its type specifying the new MAN Diesel has heralded a new era in two-stroke diesel engines with the
dual fuel, medium-speed engine from production of the first MAN B&W S40ME-B engine.
MAN Diesel. For the first time, too, The new engine has been built by STX Heavy Industry Co, Changwon.
the LNG carrier will feature five in-line The 6S40ME-B is the first such prime-mover for a series of multi-purpose
four-stroke engines, where all dual fuel vessels of 25,000dwt currently being built in China by Shandong Huanghai
installations aboard such ships to date Shipbuilding Co, and ordered by shipowner InterShip Navigation of Cyprus. The
have featured a combination of in-line engine delivers 6810kW at 146rev/min with an MEP of 21bar.
and v-type engines. The ME-B design is based on the experience gathered from MAN Diesel’s
The ship will also be the largest LNG existing MC-C and ME-C engine ranges. To suit the small-bore segment, the
carrier ever to feature electric propulsion ME-B design utilises a camshaft-operated exhaust valve and an electronically-
based on dual fuel engines. controlled fuel-injection system as seen with the ME-C range.
The eight cylinder 8L 51/60DF engines The market requirement for the lowest possible propeller speed in relation
from MAN feature a bore of 51cm and to bore size has led to the new ME-B engine having a stroke/bore ratio of 4.4.
generate 8000kW at 514rev/min. In turn, the new engine has an increased maximum cylinder pressure, giving
According to MAN Diesel head of rise to an improved fuel consumption that is 2g/kWh lower than existing, small-
sales, cruise and LNG ships, Sokrates bore engines. Thanks to the electronic control of the engine’s parameters, the
Tolgos, electing five in-line engines ME-B is also well equipped to meet the new Tier II emission requirements.
brought Elcano the ‘fuel flexibility’ that MAN Diesel introduced the ME-B concept in mid-2006 with the small-bore
it required. ‘This is a configuration that S35ME-B and S40ME-B MAN B&W engine designs. It subsequently expanded
is gaining more and more friends,’ he the series in early 2007 with the launch of the S50ME-B MAN B&W engine design.
said. ‘Each engine can burn different Some 63 orders have already been received, spread among the 35ME-B,
fuel at different loads.’ 40ME-B, and 50ME-B types.
The new propulsion system will give given time, one of the engines will be out of
the vessel a higher degree of redundancy service for maintenance purposes. On this
in terms of maintenance while sailing, and basis, operating four out of five identical
takes advantage of the 51/60DF engine’s engines avoids the operating limits that
multiple fuelling options. These comprise occur in the case of combined in-line/v-
its gaseous fuel mode, in which LNG type installations, Mr Tolgos said.
boil-off gas is ignited by pilot injection of ‘Also, if you take one of five identical
marine diesel-oil (MDO), plus two liquid- engines out of operation, you face a 20%
fuel modes in which the 51/60DF engine drop in power. If the configuration is three
can operate on either 100% MDO or 100% 12-cylinder and one six-cylinder engines,
heavy fuel oil (HFO) main injection. for example, you face a 30% drop. When
The practicalities of multi-installations you look at maintenance issues, downtime
of medium-speed engines mean, at any for in-line engines is also lower than is the
case for v-shape engines.’
The 8L 51/60DF engines will be built in
Cross section of MAN Diesel’s 51/60DF Augsburg and are scheduled for delivery
engine. in early 2009. NA
The Naval Architect March 2008 47
NA Mar 08 -
p47.indd 47 10/03/2008 12:02:08
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