What is the pressure range for a fire tube boiler?

The main design features of fire tube boilers are pressure 1–1.6–2.4 MPa, max. 4.0 MPa, steam temperature saturated, max. 400°C, and steaming rate ~10 kg/s, max.

What is operating pressure of a water tube boiler?

The capacity of the water-tube boiler can range from 5 to 120 t/h of steam, with an operating pressure of between 0.5 to 120 bar(g). The boiler can also be used in hot-water systems.

What is the pressure of high pressure boiler?

High pressure boilers heat water to create steam at over 15 psi and have water pressure over 160 psig.

What is the minimum boiler heating surface of fire tube?

470 square centimeters per kW
Heating Surface: Heating surface is defined as the fireside area of the furnace and combustion chamber plus inside (gas side) circumferential area of all convection tubes. Minimum surface shall be 470 square centimeters per kW (5 square feet per boiler horsepower).

Why does a water tube boiler has a higher operating pressure than a fire tube boiler?

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.

Why water tube boiler are high pressure boiler?

A high pressure watertube boiler (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which boils water in the steam-generating tubes.

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 is the maximum capacity of a fire tube boiler?

General maximum capacity of this type of boiler is 17.5 kg/cm 2 and with a capacity of 9 Metric Ton of steam per hour. In a fire tube boiler, the main boiler vessel is under pressure, so if this vessel is burst there will be a possibility of major accident due to this explosion.

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 working pressure of a water tube boiler?

In Fire-tube boilers hot flue gases pass through tubes and water surrounds them. In Water-tube boilers water passes through tubes and hot flue gasses surround them. These are operated at low pressures up to 20 bar. The working pressure is high enough, up to 250 bar in super critical boilers.

What is a firefire tube boiler?

Fire tube boilers are large-volume boilers. A large vessel, filled with water, is pierced with tubes of various sizes. Radiative heat transfer occurs mainly in the fire tube at the bottom. Convective heat transfer takes place in the large number of parallel gas tubes in the top.