Table of Contents
What are the types of 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.
- Reverse osmosis plant.
What are the two simple working principle of fresh water generator?
Working Principle Of Fresh Water Generator A fresh water generator works on two simple principle of distillation and effect of pressure on boiling point. The sea water is a liquid mixture of pure water and lots of salt.
How do we start fresh water 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.
What is a fresh water evaporator?
An evaporator, distiller or distilling apparatus is a piece of ship’s equipment used to produce fresh drinking water from sea water by distillation.
What are the safeties in fresh water generator?
Q. What Are The Safeties In A FWG? Ans: Safeties In A FWG Are:
- Vacuum Breaker For Releasing The Vacuum At The Time Of Shutting Down.
- Relief Valve For Releasing The Excess Pressure.
- High Salinity Alarm: It Is Fitted To The Salinometer As It Measures Higher Salt Content In The Water Produced, It Sounds The Alarm.
How did pirates get fresh water?
Since desalinating sea water was not practical, fresh water was taken aboard in casks, but quickly developed algae and became slimy. Stagnant water was sweetened with beer or wine to make it palatable, which involved more casks and was subject to spoilage.
What is the purpose of fresh water generator?
Fresh water produced from fresh water generator is used for drinking, cooking, washing and even running other important machinery which use fresh water as a cooling medium. Fresh water is generally produced on board using the evaporation method.
How do aircraft carriers make fresh water?
Fresh water is generally produced on board using the evaporation method. There are two things that are available in plenty on ship to produce fresh water –Seawater and heat. Thus fresh water is produced by evaporating sea water using heat from any of the heat source.
What are the reasons of vacuum loss in fresh water generator?
What are the causes of loss of vacuum in fresh water generator?
- Failure of ejector pump.
- Failure of ejector nozzle (fouling, erosion)
- Malfunction of check valve (at ejector nozzle)
- Defective vacuum breaker.
- Any air leakage into the system (At joint)
What is the purpose of 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 did Buccaneers eat?
Cooks would mask the taste of the rancid meats with plenty of herbs and spices. Vegetables and meat were usually pickled or salted to preserve the food. Ships on long voyages relied on biscuits, dried beans and salted beef to live. For drinking, seamen chose beer or ale rather than water.
How did sailors keep fresh water?
To keep their ships stocked with fresh water, sailors have relied on innovation and technology for centuries. Early on, they realized they could funnel rainwater from their sails into storage—once the rain had washed away the ocean spray. The vapor would then condense again into pure distilled water.
What is a freshwater generator?
A freshwater generator is a machine, usually on board a ship but in some shore-based industrial settings too, that converts salt water from seas and oceans into drinkable fresh water. The machines tend to be quite complex and rely on a series of pumps and pressure chambers as well as high temperatures to prompt both boiling and evaporation.
What is a freshwater generator for desalination?
Desalination plants often use freshwater generators. A freshwater generator is a machine, usually on board a ship but in some shore-based industrial settings too, that converts salt water from seas and oceans into drinkable fresh water.
What are the different types of fresh water generators used on board?
Various types of fresh water generators used on board ships are mainly: What ever type of plant is used, essential requirement of any fresh water generator is that it should produce fresh water as economically as possible. The shell and tube freshwater generator consist of heat exchanger, separator shell and condenser.
What are the accessories of a low pressure freshwater generator?
In addition to this water ejector, ejector pump, distillate pump, salinity indicator, demister or mesh separator, solenoid valve and water flow meter are also fitted as accessories. Basic principle of all low pressure freshwater generator is that, boiling point of water can be reduced by reducing the pressure of the atmosphere surrounding it.