What are the advantages and disadvantages of both electrical and pneumatic control systems on ships ? Electrical Control System Advantages No air compressor and associated machinery required. High efficiency since…
The purpose with the lambda controller is to prevent injection of more fuel in the combustion chamber of an auxiliary engine on the ship, than can be burned during a…
The fuel injection arrangement shown below is for a large two stroke marine diesel engine used on ships. High pressure fuel from the fuel pump is led through a double…
Fresh water production from sea water for domestic and auxiliary purposes is an essential requirement aboard ships. A considerable amount of fresh water is consumed in a ship. The crew…
Ignition Delay and Ignition Quality Ignition delay is the time between fuel injection and fuel ignition. During this time the fuel get mixed with hot compressed air and vaporizes. After…
Properties required of a crankcase oil which is to be used for a trunk piston main engine are the following: Detergency This keeps the crankcase, bearings and piston rings area…
The sketch below shows a simple, single reduction gearbox suitable for speed reductions from 750 to 150 rev/min reduction (i.e. 5:1 reduction). The main wheel would contain two journal bearings…
Checking Fuel Pump Timing The primary method of checking fuel pump timing would be using the manufacturer’s instructions of setting the fuel pump with the engine stopped. For the Bosch…
Fuel Oil Testing On-board On-board testing of the fuel could be carried out during the bunker operation by one of the engineering staff not required to supervise or monitor the…
When the fuel injector needle valve seizes, this can be when the needle is Shut – causing nil or a smaller amount of fuel to be injected (on multi valved…
Causes of Exhaust Valve Failures Exhaust valve is prone to Vanadium induced metal loss at the base of the valve Cold corrosion of the valve stem due to sulphurous effects…
Fatigue is the failure of a component under fluctuating stress, and as such all components which are exposed to alternating stress must ensure that either it has a defined service…
