🔍 Key Concepts

• Purpose of a bottom blow on an auxiliary boiler (removing sludge and sediment) • Effect of temperature and circulation on how solids are suspended vs. settled in boiler water • Why safety devices (high-water cutout, pressuretrols) must NEVER be bypassed

💭 Think About

• Think about when sludge and solids are most likely to be near the bottom blow line: right after steaming, or after the boiler has sat cold for a long period? • Which choice describes a condition that safely allows you to remove settled solids without creating thermal or mechanical shock to the boiler? • Look for the answer that improves boiler cleanliness without defeating any safety devices or putting the boiler at risk.

✅ Before You Answer

• Eliminate any option that involves bypassing or defeating safety controls. • Ask whether the boiler needs to be stone cold for a bottom blow, or just secured long enough for solids to settle safely. • Confirm which option reflects standard good practice for routine sludge removal from an auxiliary boiler.