RT flex and ME differences

RT flex uses common rail fuel injection through solinoid valves . ME uses FIVA valves to actuate hydraullic piston for fuel injection.
RT flex uses 200 bar servo oil rail for exhaust valve actuation while ME uses FIVA\ELVA valves for hydraulic actuator operation
RT uses conventional fuel pumps to pressurize common rail via camshaft and engine driven servo oil pumps to operate actuator and solenoid valves. Me uses only engine driven servo oil pumps to actuate both fuel pumps and exhaust valves
RT flex uses four electronic valves one for exhaust valve opening and other 3 for fuel injection per cylinder.
RT flex has a small camshaft for fuel pumps while ME has no camshaft.
RT flex uses FCM 200( Flex control module) ME uses MPC

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Manganese bronze is not typically used as a propeller material .Why

1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability

MAN B&W MC Engine VIT Pump

The pump is basically a jerk type with a plunger moving in a matched barrel, using two helical grooves machined in the plunger to control the end of injection by uncovering spill ports and causing the discharge pressure to drop rapidly, thus causing the needle valve in the injector to close. Oil is supplied to the barrel via the spill ports and a suction valve. The suction valve, situated at the top of the barrel opens when the pressure in the barrel falls below the supply pump pressure; i.e. during downward stroke of plunger, while spill ports are covered by plunger. Replaceable erosion plugs are fitted in the pump housing opposite the spill ports. The high pressure oil, spilling back, as the edge of the helix uncovers the s...

Main engine interlocks

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MEOclassIIexamnotes

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