In the described HRT boiler, how many tubes are installed and what is their diameter?

In the described HRT boiler, how many tubes are installed and what is their diameter?

• A. 120 tubes of 4.5 inches
• B. 100 tubes of 3 inches
• C. 90 tubes of 5 inches
• D. 150 tubes of 4 inches

Answer: (A)

The key idea here is that the boiler’s tube layout is fixed by the described design. In that HRT boiler, the configuration given specifies a total of 120 tubes, each with a 4.5-inch diameter. This combination provides the required heat-transfer surface and fit for that particular boiler design, balancing enough surface area for steam generation with manageable gas flow and pressure drop. The other numerical options would imply a different heating surface and flow characteristics, which would not match the described boiler’s specification.

The key idea here is that the boiler’s tube layout is fixed by the described design. In that HRT boiler, the configuration given specifies a total of 120 tubes, each with a 4.5-inch diameter. This combination provides the required heat-transfer surface and fit for that particular boiler design, balancing enough surface area for steam generation with manageable gas flow and pressure drop.

The other numerical options would imply a different heating surface and flow characteristics, which would not match the described boiler’s specification.