DieselShip

Engineering terms
The system of measurement has been outlined with an introduction to SI units. Some of the common terms used in engineering measurement will now be described.
Mass
Mass is the quantity of matter in a body and is proportional to the product of volume and density. The unit is the kilogram and the abbreviation used is 'kg'. Large quantities are often expressed in tonnes (t) where 1 tonne = 10s kg.
Force
Acceleration or retardation of a mass results from an applied force...

Steering gear
The steering gear provides a movement of the rudder in response to a signal from the bridge. The total system may be considered made up of three parts, control equipment, a power unit and a transmission to the rudder stock. The control equipment conveys a signal of desired rudder angle from the bridge and activates the power unit and transmission system until the desired angle is reached. The power unit provides the force, when required and with immediate effect, to move the...

chemistry & treatment of Fuels and lubes
Fuel remains one of the highest single cost factors in running a ship and also the source of the most potent operating problems. The reason for this is that new refining techniques, introduced as a result of political developments in the Middle East in 1973/74, have meant that fluid catalytic cracking and vis breaking have produced a more concentrated residual fuel of very poor quality. This residual fuel is the heavy fuel oil traditionally...

Shafting and propellers
The transmission system on a ship transmits power from the engine tothe propeller. It is made up of shafts, bearings, and Finally the propeller itself. The thrust from the propeller is transferred to the ship through the transmission system.
The different items in the system include the thrust shaft, one or more intermediate shafts and the tailshaft. These shafts are supported by the thrust block, intermediate bearings and the sterntube bearing. A sealing...

Measuring Instruments
All machinery must operate within certain desired parameters. Instrumentation enables the parameters—pressure, temperature, and so on—to be measured or displayed against a scale. A means of control is also required in order to change or alter the displayed readings to meet particular requirements. Control must be manual, the opening or closing of a valve, or automatic, where a change in the system parameter results in actions which return the value to that desired...

 
Refrigeration, air conditioning
and ventilation
 

General

Refrigeration is a process in which the temperature of a space or itscontents is reduced to below that of their surroundings. Air conditioning isthe control of temperature and humidity in a space together with thecirculation, filtering and refreshing of the air. Ventilation is thecirculation and refreshing of the air in a space without necessarily achange of temperature. With the exception of special processes, such asfish...