Question 128Steam Plants - QMED
70% to passAccording to the illustrated auxiliary steam and HP bleed steam system diagram, what are the characteristics of the steam supplied to the main feed pump drive turbines? Illustration SG-0005
A143 psig desuperheated steam
B850 psig saturated steam
C850 psig desuperheated steam
D850 psig superheated steam
AI Explanation
The correct answer is C) 850 psig desuperheated steam. The steam supplied to the main feed pump drive turbines is desuperheated, meaning that the steam has been cooled to a temperature below its superheated state, but is still at a pressure of 850 psig. This is evident from the system diagram SG-0005, which shows the steam line from the HP bleed supplying the feed pump turbines. The other options are incorrect because A) 143 psig desuperheated steam is too low in pressure, B) 850 psig saturated steam is not desuperheated, and D) 850 psig superheated steam is hotter than the desuperheated condition shown in the diagram.
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