Mechanical Seals in Pumps

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Questions and Answers

What is the purpose of 'O' ring type gaskets in a stationary mechanical seal?

  • Prevent leakage between the casing and the mating ring. (correct)
  • Support the rotation of the mating ring.
  • Prevent leakage between the shaft and the sealing ring.
  • Provide cooling to the seal housing.

What materials are commonly used for sealing and mating rings in mechanical seals?

  • Bronze, carbon graphite, ceramics, StelliteTM, and tungsten carbide. (correct)
  • Stainless steel and aluminum.
  • Copper and zinc.
  • Rubber and plastic.

Why is it important to ensure an adequate flow of quenching or cooling liquid to the seal?

  • To prevent overheating, grooving, and scoring of sealing surfaces. (correct)
  • To reduce pump shaft vibration.
  • To create a squealing sound indicating proper operation.
  • To prevent distortion of pump parts.

What can cause a leaking seal in a stationary mechanical seal?

<p>Scored or grooved seal faces. (C)</p> Signup and view all the answers

What is the consequence of running mechanical seals dry?

<p>Distorted sealing surfaces due to overheating, grooving, and scoring. (B)</p> Signup and view all the answers

What prevents leakage between the casing and the mating ring in a stationary mechanical seal?

<p>“O” ring type gaskets (A)</p> Signup and view all the answers

What is the function of the stationary sealing ring in a stationary mechanical seal?

<p>Presses against the rotating mating ring to prevent leakage (D)</p> Signup and view all the answers

What can happen if mechanical seals run dry?

<p>Sealing surfaces become overheated, grooved, and scored (C)</p> Signup and view all the answers

What is the indication of a dry seal in a mechanical pump?

<p>A squealing sound (B)</p> Signup and view all the answers

What can cause a leaking seal in a mechanical pump?

<p>Scored or grooved seal faces (C)</p> Signup and view all the answers

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