🔍 Key Concepts

• Try-cocks vs. gauge glass – what each device does on a boiler water level system • How engineers verify actual water level when a sight glass might be clogged, broken, or giving a false reading • Typical purposes of boiler fittings: blowdown valves, chemical feed, safety/sentinel valves, and how they differ from try-cocks

💭 Think About

• Ask yourself: When you open a try-cock at normal water level, what should you get out of it – steam, water, or nothing? How does this help you? • Which fitting on a boiler is normally used for chemical feed or treatment, and is that the same as a try-cock? • Think about what device would warn of low water by releasing steam to atmosphere – is that normally called a sentinel valve, a fusible plug, or a try-cock?

✅ Before You Answer

• Verify what each boiler fitting in the answers is usually used for: try-cocks, gauge glass, blowdown, chemical feed, and sentinel valves • Confirm which choice directly relates to checking water level rather than changing or treating the water • Eliminate any option that describes a function already clearly assigned to a different dedicated fitting (like a blowdown valve or chemical feed line)