API 510 Pressure Vessel Inspector
Certification Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. What is the primary purpose of API 510?
A. Design of vessels
B. Fabrication of vessels
C. In-service inspection, repair, alteration, and rerating of pressure vessels
D. Welding procedures
Answer: C
Rationale: API 510 governs inspection and maintenance of vessels already in
service.
2. Which code is primarily used for pressure vessel design?
A. API 510
B. ASME Section VIII
C. API 570
D. API 653
Answer: B
Rationale: ASME Section VIII provides rules for pressure vessel design and
construction.
, 3. MAWP stands for:
A. Maximum allowable weld pressure
B. Minimum allowable working pressure
C. Maximum allowable working pressure
D. Maximum applied working pressure
Answer: C
Rationale: MAWP is the maximum pressure a vessel can safely handle.
4. Corrosion allowance is:
A. Extra thickness for welding
B. Extra thickness added to compensate for corrosion loss
C. Thickness required by ASME
D. Minimum thickness required
Answer: B
Rationale: It accounts for expected material loss over time.
5. Who is responsible for inspection intervals?
A. Manufacturer
B. Operator
C. Authorized inspector with owner/user
D. Government
Answer: C
Rationale: Determined by inspector in coordination with owner/user.
6. Risk-Based Inspection is defined in:
A. API 570
B. API 580/581
C. API 653
D. ASME IX
Answer: B
Rationale: API 580/581 cover RBI methodology.
, 7. Hydrostatic testing uses:
A. Air
B. Steam
C. Water
D. Nitrogen
Answer: C
Rationale: Water is safer due to low compressibility.
8. A pressure relief valve protects against:
A. Corrosion
B. Cracking
C. Overpressure
D. Leakage
Answer: C
Rationale: It releases pressure to prevent vessel failure.
9. Which NDE method detects surface cracks?
A. RT
B. UT
C. MT/PT
D. VT
Answer: C
Rationale: Magnetic particle and dye penetrant detect surface flaws.
10.UT is best for:
A. Surface defects
B. Thickness measurement
C. Leak detection
D. Visual inspection
Answer: B
Rationale: Ultrasonic testing measures wall thickness.
Certification Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. What is the primary purpose of API 510?
A. Design of vessels
B. Fabrication of vessels
C. In-service inspection, repair, alteration, and rerating of pressure vessels
D. Welding procedures
Answer: C
Rationale: API 510 governs inspection and maintenance of vessels already in
service.
2. Which code is primarily used for pressure vessel design?
A. API 510
B. ASME Section VIII
C. API 570
D. API 653
Answer: B
Rationale: ASME Section VIII provides rules for pressure vessel design and
construction.
, 3. MAWP stands for:
A. Maximum allowable weld pressure
B. Minimum allowable working pressure
C. Maximum allowable working pressure
D. Maximum applied working pressure
Answer: C
Rationale: MAWP is the maximum pressure a vessel can safely handle.
4. Corrosion allowance is:
A. Extra thickness for welding
B. Extra thickness added to compensate for corrosion loss
C. Thickness required by ASME
D. Minimum thickness required
Answer: B
Rationale: It accounts for expected material loss over time.
5. Who is responsible for inspection intervals?
A. Manufacturer
B. Operator
C. Authorized inspector with owner/user
D. Government
Answer: C
Rationale: Determined by inspector in coordination with owner/user.
6. Risk-Based Inspection is defined in:
A. API 570
B. API 580/581
C. API 653
D. ASME IX
Answer: B
Rationale: API 580/581 cover RBI methodology.
, 7. Hydrostatic testing uses:
A. Air
B. Steam
C. Water
D. Nitrogen
Answer: C
Rationale: Water is safer due to low compressibility.
8. A pressure relief valve protects against:
A. Corrosion
B. Cracking
C. Overpressure
D. Leakage
Answer: C
Rationale: It releases pressure to prevent vessel failure.
9. Which NDE method detects surface cracks?
A. RT
B. UT
C. MT/PT
D. VT
Answer: C
Rationale: Magnetic particle and dye penetrant detect surface flaws.
10.UT is best for:
A. Surface defects
B. Thickness measurement
C. Leak detection
D. Visual inspection
Answer: B
Rationale: Ultrasonic testing measures wall thickness.
