Question 313General Subjects - QMED70% to pass
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?
AI Explanation
The correct answer is B) Double mechanical seal.
A double mechanical seal is the most effective type of seal for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into the atmosphere. Double mechanical seals have two separate sealing faces, creating a sealed chamber between them that can be pressurized or connected to a buffer fluid system. This design prevents any leakage of the pumped liquid to the atmosphere.
The other options are not as suitable for this application. A conventional stuffing box (A) is a less effective seal that can allow some leakage. Rubber bellows mechanical seals (C) and external mechanical seals (D) also do not provide the same level of containment as a double mechanical seal for handling hazardous liquids.
Related Questions
#311 One disadvantage of using a mechanical shaft seal instead of mechanical packing is that _______________.#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? #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 _______________.#316 A distinguishing feature of an eductor, when compared to other pumps, is the _______________.