When blowing tubes on an integral superheat...

Question 1 of 2707066636ef128f7522a1c520fc9

When blowing tubes on an integral superheat boiler fitted with an economizer, the operating sequence to be followed is recommended by the manufacturer. What section of the boiler is generally blown first and last?

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Question 1 of 27070

🔍 Key Concepts

• Boiler gas flow path from furnace to uptake in an integral superheat boiler with economizer • How soot and deposits move when you blow tubes in sequence • Manufacturer’s usual practice: start where deposits are loosest and hottest, end where gases exit

💭 Think About

• Think about the order of the gas path: which section does the hot gas contact first, and which section is closest to the stack? • If you start blowing in a downstream section, what happens to loosened soot when it reaches upstream fouled areas? • Which section would you want to clean last so that any soot carried over from earlier blowing is finally cleared before gases leave the boiler system?

✅ Before You Answer

• Verify the gas flow sequence in a typical boiler with superheater, generating bank, screening tubes, and economizer • Check which of the listed sections is closest to the furnace and which is closest to the stack/uptake • Confirm which section, if blown last, would prevent re-deposition of soot in the gas path just before discharge