Relief valves
Excess pressure in a ship service system is eased by a relief valve (Figure 1). This consists of a disc held closed by a spring loaded stem. The compression on…
Butterfly valves
A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted. The…
Globe Valve Used on Ships
Glove valve, a type of valve, is commonly used on board ships in places such as bilge suction lines. A linear motion valve, which regulates the flow of the fluid,…
Blow Through Boiler Gauge Glass on Ships
There must be two independent means of determining the water level, one of which must be a direct reading gauge glass. The other is usually a remote reading gauge in…
Cocks and valves – Ship service systems
Cocks and valves are designed to control or interrupt flow. This is done in cocks by rotating the plug, and in valves by lowering, raising or rotating a disc in…
Ship fire main system
Fire main: Whilst the various types of portable extinguishers form the front line of attack against a fire detected in its early stages, the fire main or one of the other…
Marine auxiliary diesel engine cooling system
A variety of cooling systems may be adopted for marine auxiliary engines but the most commonly used is the simple closed circuit system (Figure 7.5). Sea water is passed through…
Lubricating oil system for a marine diesel engine
Function of lubrication: The lubrication system of an engine provides a supply of lubricating oil to the various moving parts in the engine. Its main function is to enable the formation…
Checks and Precautions
Optimization Ship’s Main Engine for Slow Steaming, we discussed about all the steps that are to be taken for optimization of ships. As discussed earlier, traditionally main engines are designed…
Bunkering is Dangerous
Bunkering procedure is one such operation on a ship which has been the reason for several accidents in the past. Bunkering on a ship can be of fuel oil, sludge,…
