🔍 Key Concepts

• Purpose of blowing down boiler gauge glasses (what are you checking or preventing?) • Difference between routine scheduled maintenance and actions taken when unsure of conditions • How often safe boiler operation requires you to positively verify the true water level

💭 Think About

• Ask yourself: Is the key issue time interval (hours/shift) or operating condition/suspicion about the level? • Which option best reflects a safety-driven check to confirm the accuracy of the gauge reading, not just a fixed schedule? • In real operations, when would you most urgently want to confirm that the glass is not clogged or giving a false reading?

✅ Before You Answer

• Identify which choice is tied to safety when the indication may not be trusted rather than a fixed clock-based routine. • Consider whether boiler conditions can change in a way that makes a time-based rule (every 12 hours or twice daily) unreliable by itself. • Verify which option focuses on verifying gauge accuracy at the moment your information about water level is most critical.