Question 312General Subjects - QMED70% to pass
Mechanical shaft seals used on water service pumps require lubrication of the seal faces to minimize deposits of foreign matter on those surfaces. Which of the following pressures and lubricants are required?
AI Explanation
The correct answer is B) Water under positive pressure.
Mechanical shaft seals used on water service pumps require a positive pressure water supply to the seal faces to ensure proper lubrication and prevent the buildup of foreign matter on the seal surfaces. The positive pressure helps push the water between the seal faces, keeping them lubricated and preventing contaminants from entering. Using water under negative pressure or oil under any pressure would not provide the necessary lubrication and could lead to seal failure.
Related Questions
#310 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? #311 One disadvantage of using a mechanical shaft seal instead of mechanical packing is that _______________.#313 Which of the listed types of seals is used effectively for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into the atmosphere? #314 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? #315 When installing a mechanical shaft seal on a pump, it is important to _______________.