First SWATH Type Patrol Boat to Latvian Navy

By Keith Henderson at April 12, 2011 01:23
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Next week on 18th April the commissioning of the Skrunda into the Latvian Navy will take place in Riga, Latvia. Built by Abeking & Rasmussen, Germany she is the first of a fleet of five patrol vessels, designed by the German yard: the four other vessels will be partly built in Lemwerder and at Riga Shipyard.The patrol boat design has a length of 25.7 m, beam of 13.0 m and a draft of 2.7 m, and is derived from a well proven Abeking & Rasmussen 25m SWATH Pilot Boat design. Skrundás twin propulsion units are installed in the SWATH lower hulls: MAN D 2842 engines rated 809kW at 2100 rpm, drive Servogear CPPs via Servogear reduction gearboxes. A speed of 21.4 kn was attained during trials. [More]

Hoverbarge

By Keith Henderson at March 29, 2011 07:41
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Hovertrans Solutions Pte. Ltd, Singapore, recently announced it will be constructing a 50 tonne payload hoverbarge which is expected to be available for charter from third quarter 2011. Measuring 34m x 17m, lift is provided by two MAN 2842 LE201 diesels of 620 kW (900 hp) and can be self propelled by adding two Caterpillar powered ducted fans (air propellers) in modular propulsion units. The hoverbarge was first developed in the UK in the 1970's by Air Cushion Equipment Ltd., to provide a solution to the problem of heavy lift in difficult terrain in the global oil and gas, and specialist transportation industries. A very low ground pressure of around 0.07 bar (1 psi).makes it ideal for crossing difficult terrain such as swamps, shallow water, soft mud, sandbars, wet sand etc. When off-hover, it reverts to its ship like characteristics and floats like a normal marine barge. [More]

Automatic Engine Tuning

By 6x6volvo at August 27, 2010 18:02
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Automatic optimization of marine diesel engine performance using loop control of the cylinder pressure process has been under development for a number of years at both MAN Diesel & Turbo and Wärtsilä. Targeting the slow speed two stroke engines, the key to successful implementation of automatic loop control is reliable sensors able to accurately measure cylinder pressure, providing key data to evaluate the fuel efficiency and engine conditions. Without automatic loop control, ship engines are tuned manually to operate within safe limits while leaving a safety margin for variations in fuel properties and operating conditions. Engines are poorly balanced between cylinders and are often outside recommended deviation limits resulting in increased fuel consumption and higher CO2 emissions. The benefit of auto tuning is that the cylinder pressures are balance and at the highest acceptable pressure offering reduced fuel consumption and CO2 emissions. MAN Diesel & Turbo, ABB, and A.P.Moller have together been running loop control projects since autumn 2007. [More]

MAN Two Stage Turbo charging

By Keith Henderson at June 13, 2010 16:29
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Lower exhaust emissions of large bore diesel engines without after treatment, can be realized by increasing the mean effective pressure. One way to achieve a higher m.e.p. is to increase the boost pressure of the turbocharger however standard turbo designs are already at or approaching the limit of their capability to go from atmospheric pressure to the desired boost pressure in one unit: the solution is therefore to use two turbo stages. Simply, it comprises a low pressure turbine feeding via an inter cooler a second high pressure turbine which in turn passes through a second inter cooler to the engine. Control of a two stage turbo system including the suppression of compressor surging.is complex and is effected with the aid of variable nozzle rings (VTA) and bypasses. MAN Diesel & Turbo have recently announced their own series of two-stage turbos called the New TCX Generation. Using a configuration with the turbos at 90 degrees to each to provides a compact solution and reduce the amount of piping.
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