Difference between Fire Tube Boiler and Water Tube Boiler

Difference between Fire Tube Boiler and Water Tube Boiler:

	Fire Tube boiler	Water Tube Boiler
1.	Hot flue gases flow inside the tube and the water outside the tube.	Water flows inside the tube and the flue gases outside the tube.
2.	This boiler pressure is limited up to 20 bar. These boilers are generally low or medium pressure boiler.	This boiler pressure is up to 70-100 bar. So these boilers are generally high pressure boiler
3.	Fire tube boiler have lower rate of steam production compare to water tube.	It has higher rate of steam production.
4.	These boilers are almost internally fired. Furnace is placed at the one end of fire tube.	These boilers are generally externally fired.
5.	It is suitable for the production work like sugar mill, textile industries.	It is suitable for large power plant.
6.	Risk of explosion is lower due to low pressure.	Risk of explosion is higher due to high pressure boiler.
7.	This boiler occupies large floor space.	It occupies less floor space compare to fire tube boiler.
8.	It required less skill to operate.	It required a skilled operator.
9.	It is difficult to repair and cleaning.	It is easily clean and repairable due to externally fired.
10.	It required large shell diameter because the fire tube situated inside the shell.	It required small shell diameter.
11.	This boiler is difficult to construct.	This is simple in construction.
12.	The efficiency of fire tube boiler is less compare to water tube. It will increase by using other accessories.	This boiler is more efficient.
13.	The maintenance of this boiler is costly. It is required regular inspection.	This boiler is easy to maintain.
14.	The treatment of water is not necessary.	The water flows through small diameter tube. So water is treated before entering into the tube otherwise it will jam the tube.
15.	Example Lancashire boiler	Example Babcock and Wilcox boiler