What is freshwater generator in ship?
Fresh water generators (FWG) convert seawater (saltwater) to fresh water. FWGs are a common site on many marine vessels as it allows them to generate the fresh water they need whilst at sea. The process of generating fresh water is achieved via distillation.
How is fresh water generator onboard the ship?
The main body of a fresh water generator on the ship consists of a large cylindrical body with two compartments. One of the compartments is the condenser and the other is the evaporator. The fresh water generator also consists of an educator which helps in generating the required vacuum.
What is the principle of fresh water generator?
Fresh Water Generator Working Principle: – Water is generally produced on board using the evaporation method. – Fresh water is produced by evaporating sea water using heat from any of the heat source. – The evaporated sea water is then again cooled by the sea water and the cycle repeats.
What are the main parts of fresh water generator?
Parts of Fresh Water Generator And Their Function. A fresh water generator consists of parts such as; heat exchanger, demister, ejector pump, distillate pump, salinometer, sea water pump, orifice and control panel.
Why do we use vacuum in fresh water generator?
The submerged tube type fresh water generator explained below uses the heat from main engine jacket cooling water to produce drinkable water by evaporating seawater due to the high vacuum, which enables the feed water to evaporate at a comparative low temperature.
What is the ppm of fresh water generator?
If the density of evaporator contents is in excess of 96000 ppm, calcium sulphate scales are formed. But fresh water generator brine density is normally 80000 ppm and less. Hence scale formation due to calcium sulphate is not a problem.
What happens when vacuum reaches 100% in fresh water generator?
What will happen when vacuum reach 100% in fresh water generator? Increase the salinity because of agitation. At that time boiling rate is very high.
What is vacuum in fresh water generator?
How do you pressure test a fresh water generator?
How do you test a fresh water generator plant for leaks?
- Close the outlet of the distillate pump, vacuum breaker valve, bottom blow off valve and feed water valve.
- Inject air into the evaporator shell.
- Keep the shell pressed up to about 1.0bar gauge.
How do marine freshwater generators work?
Fresh water generator uses heat from main engine jacket cooling system which often cooling the engine passes through evaporator to evaporate the sea water feed into it. But the jacket cooling water temperatures available is about 70-80 degree celcius,whereas boiling of water is 100 degree Celsius at 1 atm.
What are the two types of freshwater generators onboard nowadays?
The equipment used on board for the production of freshwater from seawater is known as fresh water generator. Various types of fresh water generators used on board ships are mainly: Submerged tube type fresh water generator. Plate type fresh water generator, and.
How do you start a marine freshwater generator?
Starting of Fresh Water Generator:
- First we need to start the ejector pump.
- Intake of feed water:
- Start the chemical injection unit.
- Check the degree of vacuum in evaporator to 0.9 bar.
- Injecting the hot water.
- Switch ON the power of salinity indicator.
- Check the generated distillate.
- Starting the distillate pump.