In Fire-tube boilers, hot fulue gases pass through tubes and
water surrounds them. Under the following conditions, Fire-tube
boilers are chosed instead of water tube boilers.
- The working pressures are low upto 20 bar.
- For process industry, Fire-tube boilers are selected. It is not
suitable for power generation since the rate of steam are very low,
therefore, not suitable for power generation.
- The treatment of feed water is not very essential as
overheating due to scale formation cannot burst thick shell.
- Even less skill operators are sufficeint for efficient
operation.
- The overall efficiency is upto 75% which is less than
efficiency of water tube boilers.
- If the floor area is large, the fire-tube boilers are chosed
since it occupies more floor area.
- The fire-tube boilers are simple in design, easy to erect and
low maintenance cost.