Which air system is used for starting the main engine?
Well, the Starting air system uses compressed air to start the main engine. Compressed air is inserted into various cylinders in a proper sequence to provide the initial torque; required to overcome the inertia of reciprocating parts.
How will you test a leaking cylinder starting air valve of a MAN B&W MC engine?
How to test starting air valve leakage of main engine on ships? By hand touch feeling to adjacent pipe to the valve while in engine is operating. If leak, we can feel the pipe hotter than others.
What is the difference between me B and Me C engines?
ME engine electronically controls fuel injection, cylinder lubrication, and the timing on elements such as the exhaust. There are two versions of ME engine, ME-C uses electronic control on both fuel injection (FIVA Fuel Injection Valve Activation) and the exhaust valve (ELVA Electronic Exhaust Valve Activation).
How does a start air system work?
When starting the engine, compressed air is admitted to whichever cylinder has a piston just over top dead center, forcing it downward. As the engine starts to turn, the air-start valve on the next cylinder in line opens to continue the rotation.
What is a starting air valve?
The air starting valve of a marine engine is responsible to start the engine from a standstill or stop position. The Air starting valve is fitted at the centre of each cylinder head, controlling the air supply to the combustion chamber at a 30 bar pressure.
How is the starting air system admitted to engine cylinder?
Opening of the cylinder air start valve will admit compressed air into the cylinder. The pilot air is drawn from the large pipe and passes to a pilot air control valve which is operated by the engine air start lever. When the air start lever is operated, a supply of pilot air enables the remote valve to open.
Why we need to turning gear the engine before starting?
The turning gear is also used to turn the engine one or two revolutions prior to starting. This is a safety check to ensure that the engine is free to turn and that no water has collected in the cylinders.
How is a leaky air start valve detected?
The leakage of starting air valves is indicated by the overheating of line between the starting air valve and the starting air manifold, when the engine is in operation. The leakage of air can be checked from the indicator cocks of the corresponding unit.
What is MC C engine?
This engine type uses a mechanically driven camshaft for fuel injection, cylinder lubrication, and to control the timing of the starting air and exhaust. Above all the L35MC engine has won the top share in the world market and should rightly be called the world standard for small bore.
What are the advantages of me engine?
The electronic control of the engine fuel injection and exhaust valves improves low-load operation, engine acceleration, and give better engine balance and load control, leading to longer times between overhauls, also by implementation of enhanced diagnostics systems.
What should be drained in the air starting system?
The draining of compressor coolers and air receivers is important. Drains on air start systems are also checked. Flame traps or bursting caps are fitted at each air start valve but it should be noted that protection of the latter type failed to prevent a serious explosion with the loss of seven lives in I960.
What should you always check before starting a diesel engine?
Check All Important Parameters: After starting the lubrication pump, check lube oil levels and all other running pump parameters such as cooling water pressure, fuel oil temp and pressure, control and starting air pressure etc. to ensure that all are in the accepted range.
