Mechanical Seals

Question 1

Accelerated seal face wear is caused by………………?

Answer 1

Misalignment, Shaft out of Roundness, Excessive end play, Excessive Torque, Surface Finish deterioration

Question 2

If the mechanical seal face is “open” in the axial direction, this is caused by…………..?

Answer 2

End Play, Thrust movement, Temperature growth, Impeller adjustment error.

Question 3

If the mechanical seal face is “open” in the radial direction, this is caused by…………..?

Answer 3

Bent shaft, Shaft Whip, Shaft deflection.

Question 4

Typical O-ring failure modes are………………..?

Answer 4

Excessive Temperature > 55 C, Excessive Fluid Pressure, Installation Error

Question 5

A small leakage in the Mechanical Seal is caused by………….?

Answer 5

Insufficient squeeze, Installation Damage

Question 6

Mechanical Seal Embrittlement is caused by………….?

Answer 6

Contaminants, Fluid/seal incompatibility, Thermal degradation, Idle periods between use.

Question 7

A Fractured Spring in a mechanical seal is caused by……….?

Answer 7

Material flaws, Stress concentration due to tooling marks, Corrosion, Misalignment.

Question 8

Mechanical Seal compression set and low pressure leakage is caused by……………?

Answer 8

Extreme temperature operation

Question 9

Mechanical Seal face distortion is caused by………..?

Answer 9

Excessive fluid pressure on the seal, Foreign Materials trapped between the faces, Insufficient seal lubricant.

Question 10

Mechanical Seal Axial Shear is caused by………….?

Answer 10

Excessive pressure loading