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THE BOILERS AND PRESSURE VESSELS ORDINANCE, 2002 QUESTION #3979
Question 1
In a 'Fire Tube' boiler, which of the following is true regarding the heat exchange process?
  • Water circulates inside the tubes, surrounded by hot gases
  • Hot gases pass through the tubes, surrounded by water✔️
  • The boiler is only used for very high pressure ($>100~bar$)
  • There are no tubes used in the design
Correct Answer Explanation
Fire-tube boilers like the Lancashire or Locomotive types have hot gases inside tubes to heat the surrounding water.