🔍 Key Concepts

• Boiler water level and its effect on heat transfer surfaces • What happens to boiler metal surfaces when not properly covered by water • Relative immediacy and severity of damage from different boiler casualties

💭 Think About

• Which casualty can most quickly lead to overheating of boiler tubes or furnace surfaces? • Which condition is most likely to cause permanent damage or explosion risk if not corrected immediately? • Which of these problems might be serious but usually gives you a little more time to react before major damage occurs?

✅ Before You Answer

• Identify which condition directly exposes boiler heating surfaces without proper water coverage (tube overheating risk). • Consider which casualty requires immediate securing of the boiler rather than just adjusting controls. • Think about which event is usually emphasized in training as the critical emergency requiring the fastest response.