🔍 Key Concepts

• Boiler gauge glass purpose and how it works • What "blowing down" a gauge glass actually does • How sediment or impurities affect water level indication

💭 Think About

• Think about what might collect at the bottom of a gauge glass during normal boiler operation. • Consider how deposits or blockages could affect your ability to read the true water level. • Ask yourself: when you open the drain on a gauge glass, what are you really trying to clear or confirm?

✅ Before You Answer

• Be clear on the main function of a gauge glass (what does it show the engineer?). • Understand that "blowing down" involves opening valves to flush out the glass and connections—what does that help remove? • Check which options are about cleaning/clearing the indication versus doing a different engineering task.