A sudden unexplainable drop has occurred in...

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Question 1 of 205eccefa0bacbc34ba4d46e23

A sudden unexplainable drop has occurred in the outlet temperature of an uncontrolled interdeck superheater on a boiler carrying a higher than normal TDS (total dissolved solids) reading. Which of the actions listed is required?

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🔍 Key Concepts

• Effect of high TDS on boiler water (foaming, carryover, wet steam) • How an uncontrolled interdeck superheater depends on steam quality and drum level, not on firing controls • Relationship between steam drum water level and moisture content of steam entering the superheater

💭 Think About

• If outlet steam temperature suddenly drops and there is no change in firing rate, what could cause the steam reaching the superheater to become wetter or less superheated? • How would high TDS and foaming influence the amount of water droplets carried over from the drum into the superheater? • Which control action directly affects the water level and carryover conditions experienced by an interdeck superheater?

✅ Before You Answer

• Identify which option(s) directly change steam drum water level and thus carryover/foaming conditions. • Eliminate options that mainly affect combustion air/firing but not the wetness of steam entering the superheater. • Consider which action would help reduce wet steam and temperature fluctuations in a high-TDS situation.

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