If the drain regulator used in the operation...

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Question 1 of 205eccef9cbacbc34ba4d457a4

If the drain regulator used in the operation of the combined L.P. feed water heater, shown in the illustration, is incorrectly set to maintain too high of a level (condensate level covers approximately the lower half of tubes in the first stage heater) the resulting operation will __________. See illustration SG-0025.

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🔍 Key Concepts

• Heat transfer in feedwater heaters – how condensate level over the tubes affects the ability of steam to condense and give up latent heat • Drain regulator / level control – its purpose in keeping the correct condensate level around the tubes • Difference between sensible heating (hot condensate covering tubes) and latent heat transfer (steam condensing directly on tubes)

💭 Think About

• Look at the illustration and trace the path of the feedwater through the tubes and the steam/condensate around the tubes. What happens if a large portion of the tubes are submerged in liquid condensate instead of exposed to steam? • Would heat transfer be more or less efficient when tubes are surrounded by a pool of condensate compared with direct contact with steam at the same pressure? How would that change the outlet feedwater temperature? • If the drain level is too high, does this condition affect feedwater quantity control, or mainly the feedwater temperature leaving the heater?

✅ Before You Answer

• Verify what medium is supposed to contact the tubes in the first stage heater under normal conditions (mostly steam or mostly condensate?). • Consider whether high condensate level would tend to increase or decrease the temperature driving force between the shell side and the feedwater inside the tubes. • Before choosing, ask: does any option describe a situation that would impact temperature rather than flow rate or valve cycling? Focus on that.

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