Why fire tube boilers Cannot be operated at high pressures?

The fire tubes are immersed in water inside the main vessel of the boiler. As the hot gases are passed through these tubes, the heat energy of the gasses is transferred to the water surrounds them. As the steam and water is stored is the same vessel, it is quite difficult to produce very high pressure steam from.

Why the water tube boiler is suitable for high steam pressures?

Due to the small tube diameter, a water tube boiler can operate at much higher pressures than a fire tube boiler, so they are often used in power station applications that require a high steam output, high pressure steam or superheated steam.

What is disadvantage of fire tube boiler?

Fire Tube Boiler Disadvantages: The fluctuation of load cannot be easily handled. The rate of steam generation is low. A Fire boiler is used in small power plants. The maximum working pressure is up to 20 bar which is a less comparatively water tube boiler.

Why fire tube boiler is low-pressure?

Fire Tube boiler: In this boiler, the hot flue gases are present inside the tubes and water surrounds them and sometimes around the outside of the tubes. They are low-pressure boilers.

What pressure is a high pressure boiler?

15 psig
This term includes boilers used in steam tractors, threshers, steam powered sawmills, and similar uses; (b) “High pressure boiler” means a boiler in which steam or other vapor is generated at a pressure of more than 15 psig or water is heated to a temperature greater than 250°F and a pressure greater than 160 psig for …

Which boiler is high pressure boiler?

Water Tube Boiler: In this boiler, the water is present inside the tubes and the hot flue gases surround them. They are high-pressure boilers and the operating pressure is about 250 bar.

Which of the following is not a high pressure boiler?

Which of the following, is not a high pressure boiler? (D) Lamont boiler.

Which boilers are called as high pressure boilers?

Types of High Pressure Boilers

• La Mont Boiler: The Lamont boiler is a forced convection water tube boiler that uses a pump to circulate water.
• Benson Boiler:
• Loeffler Boiler:
• Velox Boiler:
• Cornish Boiler:
• Babcock and Wilcox Boiler:
• Burner:
• Coal.

What are the advantages and disadvantages of water tube boiler over fire tube boiler?

Fire Tube Boiler	Water Tube Boiler
The overall efficiency of this boiler is up to 75\%	The overall efficiency is up to 90\% with the economizer
Water doesn’t circulate in a definite direction	Water circulates in a well – defined direction

What happens if boiler pressure too high?

If the boiler pressure is too high, there’s an increased chance of leaks developing in the system. But if boiler pressure is too low, the system won’t work as well. So keeping the correct boiler pressure is important to make sure that your system heats your home efficiently.

What is the difference between high pressure boiler and low pressure boiler?

By definition, high pressure boilers are built to a maximum allowable working pressure (MAWP) above 15 psig, while low pressure boilers are designed for operation at 15 psig or below. Low pressure boilers are most commonly utilized in heating applications and require less maintenance than that of a high pressure unit.

Why would a boiler have high pressure?

Boiler pressure is controlled by the expansion vessel, the balance of air versus water in your central heating system. Too little air in your expansion vessel and the pressure may become too high. This is why it’s important that the installer work out the cause of your boiler’s high pressure.

What are the advantages of fire tube boilers?

In this way a fire tube boiler controls its own pressure. In other words this is a self pressure controlled boiler. Compact in construction. Fluctuation of steam demand can be met easily. Cheaper than water tube boiler. Due to large water the required steam pressure rising time quite high.

Can output steam pressure be too high in a fire tube boiler?

Output steam pressure cannot be very high since the water and steam are kept in same vessel. The steam received from fire tube boiler is not very dry. In a fire tube boiler, the steam drum is always under pressure, so there may be a chance of huge explosion which resulting to severe accident.

What is the pressure in a water tube boiler?

In the water tube boiler the pressure around to 100 bar and more. 5. The rate of Steam generation is Lower. Why? because the pressure is limited to only 20 bar. The rate of Steam generation is High. Why? because the pressure is limited to 100 bar and more.

What is the treatment of feed water in fire tube boiler?

Treatment of feed water is not very essential in fire tube boiler. 5. No pure feed water is required in FTB, So cost can be minimized because pure feed water is costly. 6.