21 Questions
What is the main purpose of field metallographic replication (FMR) when inspecting nozzles?
To determine the onset of fatigue damage
What is the required RT Category for a nozzle butt weld with a joint thickness of 1.75 in. (44.5 mm)?
Full
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?
0.055 in (1.4 mm)
In controlled deposition welding with special hardness limits for stress corrosion cracking resistance, where should the hardness requirements be included?
WPQ and WPS
What can cause cracking in deaerators in boiler feedwater systems?
Corrosion fatigue mechanism
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?
Imperfection
Which of the following factors contribute most to brittle fracture?
High ductility
Which of the following is not required in pressure vessel records pertinent to its mechanical integrity?
National Board registration
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?
5 ft. (1.5m)
What is the main purpose of field metallographic replication (FMR) when inspecting nozzles?
To detect brittle fracture
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?
Mid-wall delamination
Which of the following factors contribute most to brittle fracture?
Corrosion fatigue mechanism
What is the required RT Category for a nozzle butt weld with a joint thickness of 1.75 in. (44.5 mm)?
None
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?
$0.667$ in. (16.93 mm)
What can cause cracking in deaerators in boiler feedwater systems?
Repeated pressure cycling
Which of the following is used to verify the density of stop wedge comparison films and densitometer calibration?
ASTM-certified step wedge
What factor contributes most to brittle fracture?
Applied stress
What term describes an interruption of the typical structure of a material?
Discontinuity
Which insulation system can increase corrosion rates under insulation?
Contain chloride salts
What type of information is NOT required in pressure vessel records pertinent to its mechanical integrity?
National Board registration
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?
3 ft. (0.9 m)
Test your knowledge of pressure vessel inspection with this quiz. Questions cover topics like field metallographic replication, RT category requirements for nozzle butt welds, and construction specifications for vertical vessels.
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