🔍 Key Concepts

• Low-water conditions in fire-tube and water-tube boilers and why they are dangerous • The relationship between heat input (fuel) and water level in a boiler casualty • The correct order of emergency actions when water is lost in one boiler of a multi‑boiler plant

💭 Think About

• When water disappears from the gage glass, what immediate danger is the boiler in, and what action most quickly reduces that danger? • If metal surfaces are overheated due to low water, what effect will changing fuel, steam flow, or feed pressure have on the situation? • In an emergency, which action could actually make tube or shell failure more likely if done at the wrong time?

✅ Before You Answer

• Identify which choice directly stops heat input to the affected boiler and how quickly it takes effect. • Consider whether opening, closing, or blowing down anything connected to the boiler could expose overheated metal to sudden temperature or pressure changes, risking damage. • Verify standard low‑water casualty procedures in current marine engineering references or regulations before deciding which action comes first, not second or third.