Wind Tunnel Fundamentals
A wind tunnel is a tool used in aerodynamic research to study the effects of air moving past solid objects. A wind tunnel consists of a tubular passage with the object under test mounted…
Ship Automation & Control System
On a ship there are many parameters that needs to be controlled or monitored including: temperatures, pressure, level, viscosity, flow control, position of vessel, speed, torque control, voltage, current, machinery…
Reduction of Scavenge Pressure after Turbocharger Overhaul
The reduction in the turbocharger performance and hence reduced engine output after turbocharger overhaul is a clear evidence of improper overhauling procedure and assembly. Possible faults during overhauling are following:…
Fatigue Failure on Ships
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 lifetime or…
Marine Engineering Study Materials
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…
Fuel Injector Needle Valve Seizure
When the fuel injector needle valve seizes, this can be when the needle is 1. Shut – causing nil or a smaller amount of fuel to be injected (on multi valved engines)…
Fuel Oil Sampling During Bunkering
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 bunkering operation. The following tests could…
Checking Fuel Pump Timing and Quantity on Ships
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 type fuel…
Crankcase Oil for Trunk Piston Engine
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 clean…
Reduction Gearbox on Medium Speed Engines on Ships
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 for shaft…
