Back to Questions
THE BOILERS AND PRESSURE VESSELS ORDINANCE, 2002 QUESTION #3988
Question 1
'Scaling' on the internal surfaces of a boiler tube is dangerous because it:
  • Makes the boiler look old
  • Acts as an insulator, causing the metal to overheat and fail✔️
  • Increases the weight of the boiler
  • Makes the water taste bad
Correct Answer Explanation
Scale has low thermal conductivity; heat cannot transfer to water, causing the tube metal to reach melting/weakening points.