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Findings by Viswa lab could bring about a new way to settle claims
Viswa Lab reveals several peculiarities that lead to marine claims being wrongly settled



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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.

Posted to Marine Propulsion Report by Keith Henderson on 8/27/2010 8:02:55 AM | with 0 comments


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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.

Posted to Marine Propulsion Report by Keith Henderson on 6/13/2010 11:29:27 AM | with 0 comments


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The high cost and complexity of modern ships may point to an alternative to the sale or scrapping a vessel as it ceases to fulfill all the requirements of its original task. In some cases new or upgrading older engines, in other cases the propulsion configuration is changed, rewarding the operator with lower fuel costs and emissions.

Posted to Marine Propulsion Report by Keith Henderson on 2/25/2010 8:43:10 AM | with 5 comments


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