Question 320Steam Plants - 1st Asst/Chief
70% to passMost auxiliary turbine feed pumps do not require an external source of gland sealing steam because they _______________.
Aoperate with only a small amount of axial thrust
Boperate at relatively low pressures
Cutilize carbon packing rings at the low pressure end
Dexhaust to pressures above atmospheric pressure
AI Explanation
The correct answer is D) exhaust to pressures above atmospheric pressure. Auxiliary turbine feed pumps, which are used to supply water to the boiler, do not require an external source of gland sealing steam because they exhaust to pressures above atmospheric pressure. This means that the pressure at the pump's exhaust is high enough to provide the necessary gland sealing without the need for additional steam. The other answer choices, while potentially relevant to turbine feed pumps in general, do not directly address the issue of gland sealing requirements.
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