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THE BOILERS AND PRESSURE VESSELS ORDINANCE, 2002 QUESTION #4068
Question 1
'Telltale Holes' are sometimes drilled into stay-bolts to:
  • Look inside the boiler
  • Leak steam/water if the bolt cracks inside, alerting the operator✔️
  • Let air out
  • Light the fire
Correct Answer Explanation
It is a simple visual warning system for structural failure.