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HEAVY FUEL OILS

HEAVY FUEL OILS


Another important step in strengthening the status of the diesel engine in marine propulsion was R&D enabling it to burn cheaper, heavier fuel oils. Progress was spurred in the mid-1950s by the availability of cylinder lubricants able to neutralize acid combustion products and hence reduce wear rates to levels experienced with diesel oil-burning. All low speed two-stroke and many medium speed four-stroke engines are now released for operation on low grade fuels of up to 700 cSt/50°C viscosity, and development work is extending the capability to higher speed designs.

Combating the deterioration in bunker quality is just one example of how diesel engine developers—in association with lube oil technologists and fuel treatment specialists—have managed successfully to adapt designs to contemporary market demands.

 

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 With reference to cargo tanks of oil tanker The purpose of pressure vacuum valve MEO Written Exams 2
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 SR.7.2011.Q1: During a river passage the propeller of a light ship is rotating at dead show revolutions ahead when it strikes a large floating object causing a momentary drop in engine revolutions. As the Second Engineer of the vessel describe in report Engineering Knowledge(Motor) 1
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 SR.7.2011.Q2: .With reference to piston rings; State with reasons the causes of breakage. State how maintenance and engine operation can minimize breakage. Explain the possible consequences with respect to performance and safety of operating the engine Engineering Knowledge(Motor) 1
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