Question 128Steam Plants - QMED70% to pass
According 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
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.
Related Questions
#126 During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the _______________.#127 The lube oil coolers installed in a gravity lubricating oil system are located between the _______________.#129 The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities? #130 An excess pressure governor is a special type of control device which would normally be found on a _______________.#131 What is the normal destination of steam exiting a main feed pump drive turbine?