The document discusses fire tube boilers. It defines a fire tube boiler as a type of boiler where hot gases pass through tubes in a sealed water container, transferring heat to the water through the tube walls. It then lists four common types of fire tube boilers and notes advantages like easier operation and lower cost compared to water tube boilers, while disadvantages include lower heat transfer efficiency and potential danger if leakage occurs.

1. Prof. Avesahemad S. N. Husainy
Assistant Professor, Department of Mechanical Engineering
Member of ISHRAE and ASHRAE
Applied Thermodynamics I
Unit No 2 Fire Tube Boiler (Lecture 2)
https://www.youtube.com/channel/UCPVNu2txpcsFU2eZf0DPRsg
Sharad Institute of Technology College of Engineering, Yadrav (Ichalkaranji)
NAAC ‘A’ grade accredited institute, NBA accredited
programs, An ISO 9001:2015 accredited institute.
12/25/2023 ASNH 1

2. 12/25/2023 ASNH 2
A fire-tube boiler is a type of boiler in which hot gases pass from a fire through one or (many)
more tubes running through a sealed container of water. The heat of the gases is transferred
through the walls of the tubes by thermal conduction, heating the water and ultimately
creating steam.
Fire Tube Boiler

3. 12/25/2023 ASNH 3
1.Simple Vertical Boiler

4. 12/25/2023 ASNH 4
2. Scotch Marine Boiler

5. 12/25/2023 ASNH 5
3. Horizontal return tubular boiler.

6. 12/25/2023 ASNH 6
4. Cornish Boiler

7. 12/25/2023 ASNH 7
Advantages of fire tube boiler:
1. The water is supplied in shell and outside tubes while hot gas is supplied inside tubes so
the water volume can not be shaken easily when the fire tube boiler is running.
2. Fire tube boiler is so easy to use, operate, clean and maintain
3. Fire tube boiler can be used in small scale industries.
4. Fire tube boiler is relatively cheaper than water tube boiler.
Disadvantages of fire tube boiler:
1. From the furnace combustion side, required time to fill water is longer than to increase
temperature and pressure.
2. The efficiency of heat transfer (heat transfer efficiency) is bad enough because of the
heat exchanger does not use thermal radiation.
3. In case of bombers fire tube boiler would be very dangerous if a large amount of hot
water and steam have been accumulated inside (leakage occur).

8. 12/25/2023 ASNH 8
Difference between Water tube boiler & Fire tube boiler

9. 12/25/2023 ASNH 9
Perform-Reform-Transform