Pressure Vessel Inspection Quiz
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Questions and Answers

What is the main purpose of field metallographic replication (FMR) when inspecting nozzles?

  • To detect brittle fracture
  • To determine the onset of fatigue damage (correct)
  • To identify mid-wall delamination
  • To assess high temperature creep damage
  • What is the required RT Category for a nozzle butt weld with a joint thickness of 1.75 in. (44.5 mm)?

  • None
  • Full (correct)
  • Spot with a joint efficiency of 0.85
  • Spot with a joint efficiency of 0.80
  • A vertical vessel constructed with a plate thickness of 0.875 in. has a measured thickness of 0.820 in. after 5 years of service. What is the current required thickness of this vessel?

  • 1.335 in
  • 0.667 in. (16.93 mm)
  • 0.055 in (1.4 mm) (correct)
  • 0.820 in. (20.8 mm)
  • In controlled deposition welding with special hardness limits for stress corrosion cracking resistance, where should the hardness requirements be included?

    <p>WPQ and WPS</p> Signup and view all the answers

    What can cause cracking in deaerators in boiler feedwater systems?

    <p>Corrosion fatigue mechanism</p> Signup and view all the answers

    What is the term used to describe an interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical metallurgical, or physical characteristics?

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

    Which of the following factors contribute most to brittle fracture?

    <p>High ductility</p> Signup and view all the answers

    Which of the following is not required in pressure vessel records pertinent to its mechanical integrity?

    <p>National Board registration</p> Signup and view all the answers

    When it is necessary to postweld heat-treat a vessel in more than one heat due to length, what is the minimum overlap of the heated sections?

    <p>5 ft. (1.5m)</p> Signup and view all the answers

    What is the main purpose of field metallographic replication (FMR) when inspecting nozzles?

    <p>To detect brittle fracture</p> Signup and view all the answers

    What is the term used to describe an interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical, metallurgical, or physical characteristics?

    <p>Mid-wall delamination</p> Signup and view all the answers

    Which of the following factors contribute most to brittle fracture?

    <p>Corrosion fatigue mechanism</p> Signup and view all the answers

    What is the required RT Category for a nozzle butt weld with a joint thickness of 1.75 in. (44.5 mm)?

    <p>None</p> Signup and view all the answers

    When it is necessary to postweld heat-treat a vessel in more than one heat due to length, what is the minimum overlap of the heated sections?

    <p>$0.667$ in. (16.93 mm)</p> Signup and view all the answers

    What can cause cracking in deaerators in boiler feedwater systems?

    <p>Repeated pressure cycling</p> Signup and view all the answers

    Which of the following is used to verify the density of stop wedge comparison films and densitometer calibration?

    <p>ASTM-certified step wedge</p> Signup and view all the answers

    What factor contributes most to brittle fracture?

    <p>Applied stress</p> Signup and view all the answers

    What term describes an interruption of the typical structure of a material?

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

    Which insulation system can increase corrosion rates under insulation?

    <p>Contain chloride salts</p> Signup and view all the answers

    What type of information is NOT required in pressure vessel records pertinent to its mechanical integrity?

    <p>National Board registration</p> Signup and view all the answers

    What is the minimum overlap of heated sections when it is necessary to postweld heat-treat a vessel in more than one heat due to length?

    <p>3 ft. (0.9 m)</p> Signup and view all the answers

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