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MAN Propulsion Packages for New Trawler Series

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Skipasyn Icelandic trawler

Skipasyn Icelandic trawler

Advance North Atlantic Fishing

Orders for five fresh-fish trawlers feature two different ship  designs and MAN 6L27/38 engines and aft-ship equipment

Icelandic owners, HB Grandi, Vinnslustodin hf. and Hradfrystihusid Gunnvör,  have ordered newbuildings based on two different ship designs from specialist  fishing-vessel consultants and designers, Nautic and Skipasýn. Optimised for
safety, operational economy and pulling power, the 50-metre-plus vessel series differ in their choice of specified propeller, aft-ship and propeller-nozzle configurations, apart from their principal design differences. The Nautic vessels for HB Grandi will be propelled by 4-bladed, 3.8-metre MAN Alpha CP  Propellers, while the Skipasýn vessels will have larger, slower-running 4.7-
metre, 3-bladed versions for a calculated bollard pull above 50 tons.

Styrmir Petersen, Afltækni ehf, Reykjavik said: “We have been representing
MAN Diesel & Turbo for more than 20 years as sales and service agents in
the Icelandic market and now we are very pleased again to see increasing
activities and investments after the financial crisis and following tough years
for Iceland. Additionally, it is of course both interesting and challenging for us
that we will supply new MAN products and services to two state-of-the-art,
Icelandic, fresh-fish trawler designs.”

High bollard pull at low propeller revolutions

Designer/consultant Skipasýn has developed the efficient 50.7-metre trawler
design for Vinnslustodin hf. and Hradfrystihusid Gunnvör. In relation to the
design and layout of the propulsion plant, the ship designer’s fuel-saving focus
has been on the deployment of a large, efficient, 4.7-metre propeller. As a
result, the 800 r/min engine (MCR) speed has had to be geared down to an
optimal propeller speed of just 89 r/min. Blade-number optimisation resulted in
a three-bladed configuration. At the 2, 040 kW operating point, the three-
bladed MAN Alpha VBS1020 propeller – using the Alpha High Thrust nozzle –
is calculated to deliver a bollard pull above 50 tons. Both vessels will be built
in China by Huanghai Shipbuilding Co. Ltd.

Reduced consumption under more operating conditions

The three Nautic-designed, 55-metre vessels for HB Grandi, which will appear
with a distinctive bow design, will be built in Turkey by Celiktrans Shipbuilding
Co. Ltd. As with the other series, the selected propulsion engine is MAN’s six
cylinder L27/38, accompanied by four-bladed, ducted MAN Alpha VBS 860
propeller models. A key Alphatronic 3000 control-system feature will be the
tailored ‘dual-propeller load curves’ for optimising towing/trawling and free
sailing conditions.

Floating frequency

The specified, floating-frequency concept for both trawler series increases the
flexibility and economical part-load pattern. The propulsion system is able to
operate in ‘shaft-alternator mode’ with reduced engine and propeller speed
(within the corresponding 50 to 60 Hz speed envelope). With this part-load
optimisation feature offering up to 17% lower engine/propeller speed, fuel
consumption is accordingly reduced. The L27/38 engines have perfect load
and low-speed characteristics for floating frequency: high torque and approx.
50% power is available at speeds reduced from the 60 Hz load point to 50 Hz.

Alphatronic 3000
The general propulsion management and control system specified for both
trawler designs is MAN Diesel & Turbo’s new, advanced Alphatronic 3000
generation. The installations will be configured for complete control-station
set-ups at the vessels’ main bridges, starboard bridge wings, aft bridges and
engine-control rooms.

About MAN Diesel & Turbo
MAN Diesel & Turbo SE, based in Augsburg, Germany, is the world’s leading provider of large-bore diesel engines and  turbomachinery for marine and stationary applications. It designs two-stroke and four-stroke engines that are manufactured both  by the company and by its licensees. The engines have power outputs ranging from 450 kW to 87 MW. MAN Diesel & Turbo also  designs and manufactures gas turbines of up to 50 MW, steam turbines of up to 150 MW and compressors with volume flows of  up to 1.5 million m³/h and pressures of up to 1, 000 bar. The product range is rounded off by turbochargers, propellers, gas  engines and chemical reactors. MAN Diesel & Turbo’s range of goods includes complete marine propulsion systems,  turbomachinery units for the oil & gas as well as the process industries and complete power plant solutions. Customers receive worldwide after-sales services marketed under the MAN PrimeServ brand. The company employs around 14, 500 staff at more than 100 international sites, primarily in Germany, Denmark, France, Switzerland, the Czech Republic, India and China. MAN Diesel & Turbo is a company in the Power Engineering business area of MAN SE.


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