🔍 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)