Flashcards in Mechanical Seals and Packing Deck (5)
What is the rule of thumb for leakage in a compression packing?
A rate of 40 - 60 drops per minute leakage.
Where are mechanical seals never permitted?
On pumps used for fire safety.
This is because when a mechanical fails, it fails completely.
What are the four components that make up mechanical seals?
1.) A set of primary sealing surfaces.
2.) A mechanism for holding the seal faces together to form a seal.
3.) A set of secondary seals (commonly known as shaft packing or insert mounts)
4.) Metal components -
Eg. Set screws, Springs, Drive lugs, Collars, Pins, Retainers And Snap Rings
Where is the primary sealing point?
Between the stationary face and the rotating face.