Question 311General Subjects - QMED70% to pass
One disadvantage of using a mechanical shaft seal instead of mechanical packing is that _______________.
AI Explanation
The correct answer is A) seal failure usually requires the immediate removal of the pump from service.
Mechanical shaft seals are designed to provide a tight seal between the rotating shaft and the stationary pump housing. Unlike mechanical packing, which can be tightened to maintain the seal, a mechanical shaft seal does not have this adjustment capability. If the seal fails, it typically requires the immediate removal of the pump from service to replace the seal, as continuing to operate the pump with a failed seal could lead to further damage to the pump.
The other answer choices are incorrect because: B) mechanical seals do not require periodic disassembly and adjustment like packing, C) mechanical seals can be designed for high-pressure applications, and D) mechanical seals can also be used in high-temperature applications.
Related Questions
#309 Which of the devices listed is used to maintain a snug interface between the rotating and stationary seal members shown in the illustration? Illustration GS-0071 #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? #312 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? #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?