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THE BOILERS AND PRESSURE VESSELS ORDINANCE, 2002 QUESTION #4035
Question 1
'Economizer' tubes are often 'Gilled' (with fins) to:
  • Make them look nice
  • Increase the surface area for better heat transfer✔️
  • Make them stronger
  • Reduce the weight
Correct Answer Explanation
Fins allow the tubes to pick up more heat from the flue gases.