Question 391General Subjects - Assistant Engineer70% to pass
Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by _______________.
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.
Related Questions
#389 Which of the following statements is true regarding mechanical seals? #390 A recirculating, or bleed-off line is installed on a centrifugal pump in order to _______________.#392 Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrifugal pump? #393 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? #394 Item "B" in the pump illustration is the _______________. Illustration GS-0129