Question 391General Subjects - Assistant Engineer
70% to passAir leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by _______________.
Alantern rings between the packing rings
Ba compressed packing gland
Ca liquid seal
Dthe stuffing box gland
AI Explanation
The correct answer is C) a liquid seal. A liquid seal in the stuffing box prevents air leakage between the shaft and the packing. The liquid seal is created by the pressure of the liquid being pumped, which forces the packing against the shaft, creating an effective seal. This prevents air from being drawn into the pump through the stuffing box. The other options are incorrect because: A) lantern rings only provide a path for lubrication, not a seal; B) a compressed packing gland alone does not prevent air leakage; and D) the stuffing box gland tightens the packing, but does not create a liquid seal.
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