DieselShip

VIBRATION
Many problems have their roots in, or manifest themselves as, vibration. Vibration may be in any linear direction, and it may be rotational (torsional). Vibration may be resonant, at one of its natural frequencies, or forced. It may affect any group of components, or any one. It can occur at any frequency up to those which are more commonly called noise.
That vibration failures are less dramatic now than formerly is due to the advances in our understanding of it during the last 80...

Cylinder Liner Characteristics
The four stroke engine liners do not require any ports and are relatively simpler in construction as compared to cylinder liners for two stroke engines discussed previously. Instead of ports, a 4-S engine contains valves and the valve timing is controlled by the cams. The upper end of the liner forms a flange of sufficient strength to support it. A flange is secured between the cylinder cover and the jacket or engine and the lower part of the liner is free for...

Selection of Engine and Engine Plant
Choosing a propulsion engine or engines and the most suitable plant configuration for a given newbuilding or retrofit project is not a simple decision. It dictates careful study of the machinery options available and the operating profile of the ship.
In the past the shipowner or designer had the straight choice of a direct-coupled low speed two-stroke engine driving a fixed pitch propeller or a geared medium speed four-stroke engine driving either a...

Uncooled Fuel Injectors
Introduction
Hydraulically operated uncooled diesel fuel injectors are fitted in large two stroke diesel marine engines. The main characteristic feature of these types of fuel injectors used in the main engine fuel injection system of ships is that cooling effect is not provided to the injectors, by the fuel oil. In this article, we will take a look at the construction and working of such diesel injectors. Take a look at the sketch below before you read further, in...

{module NUCLEAR PROPULSION}Nuclear Propulsion
A nuclear-powered ship is constructed with the nuclear power plant inside a section of the ship cded the reactor compartment. The components of the nuclear power plant include a high-strength steel reactor vessel, heat exchanger(s) (steam generator), and associated piping, pumps, and valves. Each reactor plant contains over 100 tons of lead shielding, part of which is made radioactive by contact with radioactive material or by neutron activation of...

ENGINE SAFETY DEVICES
Engine Safety devices
The main engine safety devices are provided in the system to safe gaurd the main engine in case of any damage in the system Mainly are fitted in engine when all the alarm and trips fails to work then the last means for safe gaurding the engine and components is these safety devices fitted in the main engine .These are mainly of the type of pressure relief valve which release the excess pressure built in case of malfunctioning of the engine and no...