Operating Characteristics of Positive Displacement Pumps Quiz
10 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main principle of operation for positive displacement pumps?

  • Creating a void at the suction inlet, filling it with incompressible fluid, and then moving the fluid to the discharge (correct)
  • Filling the void with compressible fluid
  • Moving the fluid from the discharge to the suction inlet
  • Creating a void at the discharge inlet

    • What happens if a positive displacement pump is driven at a constant speed?

  • It supplies a variable volume of fluid based on the discharge head
  • It causes damage to the pump or piping system
  • It fails to develop any pressure
  • It supplies a constant volume of fluid regardless of the discharge head (correct)

    • Why must positive displacement pumps be equipped with a pressure relief device in the discharge line?

  • To prevent any fluid flow to the storage tank
  • To prevent damage to the pump or piping system if the discharge valve is inadvertently closed (correct)
  • To avoid developing considerable vacuum at the suction inlet
  • To increase the discharge pressure

    • What distinguishes positive displacement pumps from centrifugal pumps in terms of clearance between impeller and casing?

    <p>Positive displacement pumps have minute clearance compared to centrifugal pumps</p> Signup and view all the answers

    Why do positive displacement pumps develop considerable discharge pressure?

    <p>Due to minute clearance between pressure-imposing element and pump housing</p> Signup and view all the answers

    What is the reason positive displacement pumps are considered self-priming?

    <p>They can develop great vacuum and draw fluids to considerable height</p> Signup and view all the answers

    Why is it advisable to manually prime rotary types of positive displacement pumps before starting?

    <p>They do not develop great suction lift like reciprocating pumps do</p> Signup and view all the answers

    What should be checked prior to removing a lockout when starting positive displacement pumps?

    <p>Examine the coupling and ensure it is secure and does not have excessive play</p> Signup and view all the answers

    What should be monitored after starting a pump according to the text?

    <p>Suction and discharge pressures, pump temperature, pump vibration, connections, and seals for leakage</p> Signup and view all the answers

    What is a recommended routine check for all pumps according to the text?

    <p>Monitoring lubricator levels, adding oil when required, monitoring suction and discharge pressures, checking for leaks in mechanical seals or packing, tightening the packing if required, reporting maintenance concerns</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser