31/01/2026
Fire Tube Boiler – Description
This image shows a Fire Tube Boiler (also called a shell boiler) with internal parts clearly illustrated.
How it works (simple):
Fuel (gas/oil) burns in the burner
The hot flame and flue gases pass through fire tubes
These tubes are surrounded by water
Heat transfers from hot gases to water, producing steam or hot water
Exhaust gases exit through the exhaust stack
Main parts shown:
Burner (Gas/Oil / Combination) – Produces flame
Combustion Chamber – Where fuel burns
Fire Tubes – Carry hot gases through water
Boiler Shell / Body – Holds water
Exhaust Stack – Releases flue gases
Flame Sight Port – Visual flame inspection
Access Doors (Front & Rear) – Maintenance and cleaning
Safety Controls & Piping – Pressure, temperature, safety valves
Fully Automated Controls – Automatic operation
Skids & Supports – Structural base
ASME Code Piping – Safety-standard piping
Applications:
Hotels & hospitals
Industries
Heating plants
Process steam generation
Key advantages:
✔ Simple design
✔ Easy maintenance
✔ Cost-effective for low & medium pressure
✔ Compact size
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