Written by johnhansen Sunday, 10 January 2010 11:54

Proper speed of the pump doesn't allow slops to build up , otherwise rewashed resulting in lost of time, that's why throughout the cleaning process , Expertise always kept cargo pump ( suitable with proper speed ) in runing condition.
BENEFIT OF BALANCED CARGO PUMP SPEED :
The flow of water through the pump acts as a cooling for the seals.If the pump runs dry for a while the seals might get damaged from overheating.
Written by johnhansen Friday, 08 January 2010 18:42

Ships are always surrounded by literally unlimited quantity of water, except perhaps when undergoing drydock repairs. Since there are human beings on board on all types of ships, we certainly need drinking water on board. We have already studied about the machine known as the fresh water generator which is used to produce pure water out of the salty sea water.
Written by johnhansen Friday, 08 January 2010 18:34

Thermostatic expansion valve is one of the most commonly used throttling devices in the refrigeration and air conditioning systems. Let us see the details of this valve that automatically maintains the flow of the refrigerant inside the evaporator.
What is Thermostatic Expansion Valve or TEV?
Thermostatic expansion valve or TEV is one of the most commonly used throttling devices in the refrigerator and air conditioning systems. The thermostatic expansion valve is the automatic valve that maintains proper flow of the refrigerant in the evaporator as per the load inside the evaporator. If the load inside the evaporator is higher it allows the increase in flow of the refrigerant and when the load reduces it allows the reduction in the flow of the refrigerant. This leads to highly efficient working of the compressor and the whole refrigeration and the air conditioning plant.
Written by Bobby Monday, 27 July 2009 02:41
DensityWritten by Bobby Monday, 27 July 2009 02:02
A lubricating grease is a solid or semi-fluid lubricant containing a thickening agent in a liquid lubricant. Grease can be likened to a sponge soaked in lubricant. In cases of a soap based grease the soap can be likened to the sponge soaked in a mineral oil as the lubricant.Written by Bobby Thursday, 23 July 2009 08:07

A sample of gas is drawn into the sample chamber using the hand pump. Any combustibles land on the surface of the hot wire and burn increaseing the temperature of the wire thereby increaseing the resistance.
Written by Bobby Thursday, 23 July 2009 07:45
Gas fire-extinguishing systems in machinery spacesWritten by Bobby Thursday, 23 July 2009 07:32
Must be fitted to passenger ships carrying less than 36 passengers in the accommodation spaces and other areas considered necessary be the administration. For pasenger ships carrying greater than 36 passengers it must be fitted to accommodation spaces, corridors, stairwells and to control stations ( the latter may be served by an alternative system to prevent damage). The system must be of an approved type. See below for full requirements.
Generally takes the form of a wet pipe (line continuosly flooded) on to which are connected a number of sprinkler head. These heads consist of a valve held shut by a high expansion fluid filled quartzoid bulb. A small air space is incorporated.

When a fire occurs in an adjacent area to this bulb the fluid expands until the air space is filled, increasing internal pressure causes the bulb to fracture. The size of the air gap determines the temperature at which this failure occurs. The valve plug falls out and a jet of water exits , striking the spray generator where it is then distributed evenly over the surrounding area. In acting this way only the area of the fire is deluged and damage is minimised.

Water is supplied from an air pressurised water tank ( thus the system functions without electrical power), this water is fresh water to minimise damage. The tank is half filled with water and the rest is compressed air at pressure sufficient to ensure that all the water is delivered to the highest sprinkler at sprinkler head working pressure. Once this source of water is exhausted, falling main pressure is detected by a pressure switch. This activates a sea water supply pump. A valve is fitted on the system to allow proper testing of this function. After sea water has entered the system proper flushing with fresh water is required to prevent corrosion
A shore connection may be connected to the system to allow function during dry-dock
High Pressure Water spray system
A similar but essentially different system exists for the supply of water under pressure to dry pipes onto which sprinkler heads are fitted. These sprinkler heads do not have the bulb and valve arrangement. Instead when an area is to be served a relevant isolation valves is opened. The fundamental difference between this and the sprinkler system is that human intervention is required, whereas the sprinkler system is required to be fully automated. Commonly a cross connection vai a non-return valve exists able to deliver to the water from the high pressure spray system to the sprinkler system.

When an isolation valve is opened pressure in the line falls and the sea water pump is started. The air vessel is there to prevent cycling of the pump due to slight water leakage. The fresh water pump is there for flushing and initial filling of wet pipe only.
Written by Bobby Thursday, 23 July 2009 06:51
Capacity of fire pumpsWritten by Bobby Thursday, 23 July 2009 06:48
Components of plantScrubber- Flue gas passes to the scrubber via the uptake valve, here it enters at the bottom via a waterseal and passes up through a series of sea water sprays and baffle plates being cooled and cleaned before exiting via a demister.
Written by Bobby Sunday, 19 July 2009 01:39
Definitions:Inert conditions- This is where a space has had its oxygen content reduced to 8% or less
Inert gas plant- This is a system specially designed to supply cool, clean, pressurised, monitored and controlled inert gas.