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SHIPS AND SHIPPING January 2010 33
Hong Kong's booming economy inspires maritime industry
With its share market surging and property prices hitting new
highs, the Hong Kong economy seems to have completely
shrugged off the Global Financial Crisis.
While parts of the shipping sector, most notably containers,
have suffered badly thanks to the GFC, many others have
continued to flourish.
"As the most efficient gateway to China, particularly southern
China, Hong Kong is riding the wave of China's almost uniquely
strong economy," said the organiser of the China Maritime
Exhibition, Kishore Navani.
"This continuing economic boom is certainly good for the
wider maritime industry," said Mr Navani. "We are certainly
seeing this reflected in the great interest being shown in China
Maritime which will be held in mid-March."
"The ship and boat design, building and equipment market
has, thanks to the GFC, become much more competitive than it
was for the previous two showings of China Maritime in 2006
"We are seeing this very clearly in the much stronger interest
being shown in the event by Chinese mainland ship builders and
suppliers," Mr Navani explained.
China Maritime will be held in Hall 5G of the Hong Kong
Convention and Exhibition Centre in Wanchai from Tuesday,
March 16 to Thursday, March 18.
For further information please contact:
Kishore Navani. Baird Events, Australia.
PH: +61 3 9645 0411, FX: +61 3 9645 0475,
Email: firstname.lastname@example.org, Web: www.bairdmaritime.com
The latest development from Becker Marine Systems is the
successful market launch of the new Mewis Duct
Based on hydrodynamic statutes, the duct combines very
consequentially different theories of fluid dynamics. Countless
calculations, dozens of tank tests and final true scale tests have
proved the enormous fuel saving potential of the product. Up to
ten percent fuel saving is possible, making a dramatic
contribution to both ship's costs and environmental protection.
The most important outcome of the sea trials of the Mewis
Duct is that the power-saving predictions from Becker's
CF-calculations and from the research institute match the sea
The shaft power and speed trial measurements were carried
out by an independent company. The pure sea trial
measurements cannot be compared directly with the model
tests. Instead, the conditions of the ship and the environment
must be corrected to standardised conditions, and this was done
by The Hamburg Ship Model Basin (HSVA).
The sea trial measurements were carried out in light load
conditions. With an installed Mewis Duct at a ship speed of
16.45 knots, approximately 4.5 percent of propulsion power
When the ship speed was increased to 17 knots, technicians
were able to measure a power reduction of approximately six
percent. This corresponds to an estimated cost saving with the
Mewis Duct of approximately US$230,000 per year at a bunker
price of US$460/tonne and at 220 operating days per year.
The tests showed that greenhouse gases were also considerably
reduced, with a reduction for nitrogus oxide (NOx) of
approximately 50,000 tonnes per year and a reduction of carbon
dioxide (CO2) of approximately 1,600 tonnes per year.
Becker Marine Systems' research found that the wake field of
full-form vessels, such as tankers, reduces the propeller's
propulsion efficiency. The water flow velocity has such an
unfavorable characteristic that the propeller does not get a
uniform water flow.
The Mewis Duct is a propulsive improvement device for
full-form ships (meaning mainly tankers, bulk carriers and
multi-purpose vessels). These vessels represent the larger part of
the world's shipping fleet.
An improvement in the propulsive efficiency of those ship
types will contribute significantly to the reduction of polluting
emissions and to the saving of carbon fuel in shipping. Ships are
propelled by combustion engines whose power output is
dimensioned by the ship's hull resistance, the propeller efficiency
and the desired speed range. The Mewis Duct reduces the power
requirement by improving water inflow toward the propeller to
achieve a higher overall propulsive efficiency.
The Mewis Duct consists of two strong fixed elements
mounted on the vessel: a duct, positioned ahead of the propeller
together with an integrated fin system within. The duct
straightens and accelerates the hull's wake into the propeller and
also produces a net ahead thrust. The individually placed fins
have a stator effect by generating a pre-swirl in the counter
direction of the propeller's operation, recovering the rotational
energy from the propeller slipstream.
The achievable power savings from the Mewis Duct are
strongly dependent on the propeller thrust loading, from three
percent for small container vessels up to ten percent for large
tankers and bulk carriers.
For the tests the Mewis Duct was retrofitted to a Grieg
Shipping open hatch general cargo carrier with a length between
perpendiculars of 187 metres, a beam of 31 metres and a
designed draught of 12 metres. The vessel, with a designed speed
of 16 knots, was equipped with a seven-metre-diameter,
four-bladed fixed pitch propeller.
For further information contact:
Becker Marine Systems, Germany.
The Becker Marine Systems Mewis Duct in full scale prior to retrofitting
Retrofitting the Mewis Duct
The Becker Mewis Duct's successful improvement of propulsive efficiency
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