Difference between Fire tube boiler and water tube boiler




Structure

Both are shell and tube type of boiler, fire tube have hot gases inside the tube while water tube have water inside the tube and hot gases surrounding them





Steam pressure

Steam pressure limit of the fire tube boiler is lies between 20-30 bar and the pressure limit of the water tube boiler is much more than the fire tube boiler and is unlimited within the design limits





Unit output

unit output of the boilers mainly depends on the design limits. Unit output of the fire tube boiler is 20 MW and that of the water tube boiler is unlimited





Fuel

On both fire tube and water tube boiler any type of fuel can be used for providing the heat. Fire tube mostly used commercial fuel and treated wast while in water tube you can used any fuel available 


Efficiency

Normal efficiency of the fire tube boiler is about 80 to 85 % but this can be increase or decrease by using different a accessories. Efficiency of the water tube boiler is more than that of fire tube and lies within the range of 85 to 90 %. efficiency of water tube boiler can also be increased by using different accessories





Application

Fire tube boiler are usually used for the heating purposes while water tube boiler is used for power and heat supply





Inspection requirements 

Fire tube boiler need for regular inspection than that needed for the water tube boiler





Erection

Fire tube boiler is packed and ready for the work at working site while water tube boiler is need to be shop assembled and erected at site




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