🔍 Key Concepts

• Boiler forced draft (FD) system and what happens when you increase FD pressure • Purpose and procedure of soot blowing / tube blowing in a marine boiler • How steam pressure, combustion, and soot removal are affected during soot blowing

💭 Think About

• When you blow tubes, what immediate effect does it have on combustion conditions in the furnace and uptake? • If FD pressure is not increased before blowing tubes, what important operating parameter is most likely to be disturbed? • Which choice describes something that must be protected or stabilized during the short disturbance caused by tube blowing?

✅ Before You Answer

• Identify which option relates directly to overall boiler operation and steam production, not just cleanliness or soot movement • Consider which effect happens immediately during blowing, rather than a long-term benefit • Ask: which option describes something that engineers actively try to keep constant during any short disturbance to the boiler?