API 510 Pressure Vessel Inspector Certification
Exam practice test with Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What is the main purpose of the API 510 code?
a) To design new pressure vessels
b) To construct new pressure vessels
c) To inspect, repair, alter, and rerate in-service pressure vessels
d) To operate pressure vessels
The API 510 code provides requirements for inspection, repair,
alteration, and rerating of in-service pressure vessels, not for
initial design.
2. Which of the following is considered a pressure-retaining part of a
vessel?
a) Support legs
b) Shell, heads, and nozzles
c) External insulation
d) Skirt support
Only parts that retain pressure, like shells, heads, and nozzles, fall
under API 510 inspection.
3. What is the minimum thickness a pressure vessel shell can have
before it requires a detailed inspection?
a) 1/16 inch
, b) 1/8 inch
c) Thickness per API 510 calculations or code minimum
d) 1/4 inch
Inspection requirements depend on calculated or code minimum
thickness; there is no fixed universal thickness.
4. Which inspection method is required for detecting surface cracks
on pressure vessels?
a) Radiography
b) Hydrostatic testing
c) Liquid penetrant or magnetic particle testing
d) Ultrasonic thickness only
Liquid penetrant and magnetic particle methods are effective for
detecting surface-breaking cracks.
5. How often must internal inspections be conducted according to
API 510?
a) Every 6 months
b) Every 5 years
c) Based on risk assessment and previous inspection results
d) Only at the end of vessel life
Inspection frequency is determined by risk assessment, service
conditions, and prior inspection findings.
6. What is the primary purpose of a hydrostatic test?
a) Measure thickness
b) Check internal temperature
c) Verify structural integrity under pressure
d) Detect surface cracks
, Hydrostatic testing ensures the vessel can safely withstand its
design pressure.
7. When is a pressure vessel considered “out of service”?
a) During normal operation
b) When all pressure has been released and isolation is
confirmed
c) When valves are closed
d) During hot work
A vessel is “out of service” only after proper depressurization and
isolation.
8. What is the allowable corrosion allowance for a carbon steel
vessel operating at 400°F?
a) 0.01 in
b) As specified in the original design or code minimum
c) 0.25 in
d) 0.50 in
Corrosion allowance is determined by the original design,
operating conditions, and API code.
9. Which type of weld is most likely to require radiographic
inspection?
a) Fillet weld on non-pressure part
b) Butt weld in pressure-retaining component
c) Tack welds
d) Overlay welds
Pressure-retaining butt welds are critical and require volumetric
examination like radiography.
Exam practice test with Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the main purpose of the API 510 code?
a) To design new pressure vessels
b) To construct new pressure vessels
c) To inspect, repair, alter, and rerate in-service pressure vessels
d) To operate pressure vessels
The API 510 code provides requirements for inspection, repair,
alteration, and rerating of in-service pressure vessels, not for
initial design.
2. Which of the following is considered a pressure-retaining part of a
vessel?
a) Support legs
b) Shell, heads, and nozzles
c) External insulation
d) Skirt support
Only parts that retain pressure, like shells, heads, and nozzles, fall
under API 510 inspection.
3. What is the minimum thickness a pressure vessel shell can have
before it requires a detailed inspection?
a) 1/16 inch
, b) 1/8 inch
c) Thickness per API 510 calculations or code minimum
d) 1/4 inch
Inspection requirements depend on calculated or code minimum
thickness; there is no fixed universal thickness.
4. Which inspection method is required for detecting surface cracks
on pressure vessels?
a) Radiography
b) Hydrostatic testing
c) Liquid penetrant or magnetic particle testing
d) Ultrasonic thickness only
Liquid penetrant and magnetic particle methods are effective for
detecting surface-breaking cracks.
5. How often must internal inspections be conducted according to
API 510?
a) Every 6 months
b) Every 5 years
c) Based on risk assessment and previous inspection results
d) Only at the end of vessel life
Inspection frequency is determined by risk assessment, service
conditions, and prior inspection findings.
6. What is the primary purpose of a hydrostatic test?
a) Measure thickness
b) Check internal temperature
c) Verify structural integrity under pressure
d) Detect surface cracks
, Hydrostatic testing ensures the vessel can safely withstand its
design pressure.
7. When is a pressure vessel considered “out of service”?
a) During normal operation
b) When all pressure has been released and isolation is
confirmed
c) When valves are closed
d) During hot work
A vessel is “out of service” only after proper depressurization and
isolation.
8. What is the allowable corrosion allowance for a carbon steel
vessel operating at 400°F?
a) 0.01 in
b) As specified in the original design or code minimum
c) 0.25 in
d) 0.50 in
Corrosion allowance is determined by the original design,
operating conditions, and API code.
9. Which type of weld is most likely to require radiographic
inspection?
a) Fillet weld on non-pressure part
b) Butt weld in pressure-retaining component
c) Tack welds
d) Overlay welds
Pressure-retaining butt welds are critical and require volumetric
examination like radiography.
