Compressor Lubrication Methods
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Questions and Answers

Why is leakage of compressed gases around the shaft of a compressor considered detrimental?

  • It improves the performance of the compressor
  • It results in energy wastage (correct)
  • It increases the efficiency of the compressor
  • It causes safety hazards only

    • Where are labyrinth seals typically used?

  • In air compressors where some gas leakage is acceptable (correct)
  • In environments where zero gas leakage is permissible
  • In compressors handling combustible gases
  • In compressors handling toxic gases

    • What is a characteristic feature of labyrinth seals that makes them effective at preventing gas leakage?

  • They present an intricate path for escaping gases (correct)
  • They allow direct escape of gases
  • They have a wide clearance to the shaft
  • They have smooth edges

    • How are carbon ring seals different from labyrinth seals?

    <p>They wear considerably due to the near zero clearance design</p> Signup and view all the answers

    Why can the entire seal assembly of carbon ring seals be removed from the compressor?

    <p>To replace broken segments or worn seals</p> Signup and view all the answers

    What type of seal creates a thin liquid film between the seal and the rotating shaft?

    <p>Liquid film seal</p> Signup and view all the answers

    Why is it important to cool the air in between compression stages and after the last stage?

    <p>To remove water and oil vapours</p> Signup and view all the answers

    What could happen if oil vapour is not condensed and removed from the compressed air?

    <p>It could ignite and explode in pipes and reservoirs</p> Signup and view all the answers

    How do intercoolers contribute to the compression process?

    <p>By decreasing the power needed for compression</p> Signup and view all the answers

    What type of aftercooler is typically used when the compressor itself is air-cooled?

    <p>Air-cooled</p> Signup and view all the answers

    What purpose does the cyclone separator serve in relation to the aftercooler?

    <p>To remove moisture and particles from the air stream</p> Signup and view all the answers

    Which of the following is a role of adsorbents in an air dryer system?

    <p>Attracting moisture from the air volume</p> Signup and view all the answers

    What is one potential consequence of moist control air in instrumentation lines?

    <p>Risk of plugging nozzles in controllers and positioners</p> Signup and view all the answers

    Why is it crucial to have separators installed close to aftercoolers?

    <p>To remove condensed moisture and particles</p> Signup and view all the answers

    What is a primary function of an air dryer filled with adsorbents like silica gel in an air dryer system?

    <p>Attracting moisture via a condensation process</p> Signup and view all the answers

    What is the purpose of regenerating the adsorbent in air dryers?

    <p>To drive off the adsorbed moisture by evaporation</p> Signup and view all the answers

    Why are absorbents not commonly used in air dryers?

    <p>Absorbents add significant pressure loss to the system</p> Signup and view all the answers

    What is the function of an air receiver in a compressed air system?

    <p>To reduce pulsations in the discharge pressure of a reciprocating compressor</p> Signup and view all the answers

    Why should safety valves in air receivers be tested regularly?

    <p>To ensure they are functioning correctly</p> Signup and view all the answers

    What can result from overpressure conditions in an air receiver?

    <p>Rupture of piping or equipment</p> Signup and view all the answers

    Why are check valves used in a compressed air distribution system?

    <p>To prevent high-pressure air backflow</p> Signup and view all the answers

    How do refrigerated air dryers work to remove moisture from compressed air?

    <p>By cooling and condensing the water vapors</p> Signup and view all the answers

    What is one of the functions of an air-to-air heat exchanger in a refrigerated air dryer system?

    <p>To warm up the outgoing dry compressed air</p> Signup and view all the answers

    Which of the following is NOT typically a component of an air receiver?

    <p>An intercooler</p> Signup and view all the answers

    What is a crucial reason for keeping safety valves in an air receiver properly maintained?

    <p>To ensure proper operation and prevent overpressure conditions in the system</p> Signup and view all the answers

    What is the purpose of the oil injected between the rings in a seal?

    <p>To prevent wear and heat generation</p> Signup and view all the answers

    Why are mechanical seals preferred over labyrinth or carbon ring seals?

    <p>They provide better sealing capabilities</p> Signup and view all the answers

    In what type of compressors are oil-free packing ring seals commonly used?

    <p>Reciprocating gas compressors</p> Signup and view all the answers

    What is a characteristic of dry gas seals compared to other seal types?

    <p>They use sealing or separation gas</p> Signup and view all the answers

    Why are tandem dry gas seals used with flammable and toxic gases?

    <p>To prevent leakage into the atmosphere</p> Signup and view all the answers

    Which type of bearing material is typically used in smaller compressors?

    <p>Bronze</p> Signup and view all the answers

    How are compressor bearings lubricated in the splash system?

    <p>By splashing oil from the bottom part of the crankcase</p> Signup and view all the answers

    Which type of compressor does not require internal lubrication?

    <p>Centrifugal compressors</p> Signup and view all the answers

    What is the purpose of an intercooler in a compressor system?

    <p>To cool the gas before compression</p> Signup and view all the answers

    In reciprocating compressors, how is cylinder lubrication mainly provided?

    <p>By splash lubrication</p> Signup and view all the answers

    What is the function of the pressure relief valve in a compressor?

    <p>To prevent overpressure in the discharge line</p> Signup and view all the answers

    Why do some applications, like in food processing and medical industries, require oil-free compressors?

    <p>To ensure compressed air quality</p> Signup and view all the answers

    For small single-acting reciprocating compressors, what lubrication system is frequently used?

    <p>Splash system</p> Signup and view all the answers

    What part of a compressor system is responsible for removing some heat of compression after the first stage?

    <p>Intercooler</p> Signup and view all the answers

    How is lubricating oil delivered to the cylinder walls in reciprocating compressors?

    <p>By mechanical lubricator</p> Signup and view all the answers

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