When a vessel is in port, stack type air...

Question 1 / 270705eccefa0bacbc34ba4d46ecf

Question 1 of 270705eccefa0bacbc34ba4d46ecf

When a vessel is in port, stack type air heaters are bypassed in order to prevent __________.

Question 1 of 27070

When a vessel is in port, stack type air heaters are bypassed in order to prevent __________.

🔍 Key Concepts

• Purpose of stack (air pre-)heaters in a boiler/engine exhaust system • Effect of operating at low load or idle in port on temperatures and condensation in gas paths • Relationship between temperature, condensation, and corrosion in exhaust/air heater surfaces

💭 Think About

• Ask what changes in gas temperature and flow happen when a plant is in port versus at sea under load • Consider which problem would be more serious at low gas temperatures: pressure/flow problems, or material/condensation problems • Think about what happens if moist combustion products cool below their dew point inside metal heating surfaces

✅ Before You Answer

• Verify which option is directly related to low stack gas temperature conditions • Check which choices refer to flow/pressure issues and ask if those are more likely at sea (full load) or in port (low load/idle) • Confirm which option best matches a long‑term material damage/maintenance concern rather than an immediate combustion performance issue

Question 1 of 27070

When a vessel is in port, stack type air heaters are bypassed in order to prevent __________.

insufficient air supply to the fires due to the pressure drop across the heater

corrosion of the heater due to low stack temperatures

excessive back pressure in the furnace due to low flow rates

localized heat stressing of air heater surfaces

Question 1 / 270705eccefa0bacbc34ba4d46ecf

Question 1 of 270705eccefa0bacbc34ba4d46ecf

When a vessel is in port, stack type air heaters are bypassed in order to prevent __________.

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Question 1 of 27070

When a vessel is in port, stack type air heaters are bypassed in order to prevent __________.