API 653 Aboveground Storage Tank
Inspector Certification Exam Prep
Document 2025/2026 | Tank Inspection,
Integrity Management Exam QUESTIONS
AND VERIFIED ACCURATE SOLUTION
(DETAILED & ELABORATED) |GET IT 100%
ACCURATE!! 2026 TEST
1. What is the primary purpose of API 653?
A. Pipeline inspection standards
B. Aboveground storage tank inspection, repair, alteration,
and reconstruction
C. Electrical system design
D. Offshore drilling safety
Answer: B
Rationale: API 653 governs inspection, repair, alteration, and
reconstruction of aboveground storage tanks.
2. Which API standard governs tank design?
A. API 570
B. API 650
C. API 510
D. API 1169
Answer: B
Rationale: API 650 covers design and construction of welded
steel storage tanks.
,3. What is the most common cause of tank bottom failure?
A. Overpressure
B. Corrosion
C. Wind loading
D. Paint failure
Answer: B
Rationale: Corrosion, especially under the tank bottom, is the
leading cause of failure.
4. What is typically used to evaluate bottom thickness?
A. Ultrasonic testing
B. Hydrostatic testing only
C. Radiography only
D. Magnetic particle testing
Answer: A
Rationale: Ultrasonic thickness testing is standard for
measuring plate thickness.
5. What is the main purpose of a tank settlement survey?
A. Measure corrosion
B. Evaluate foundation movement
C. Test weld quality
D. Inspect coating thickness
Answer: B
Rationale: Settlement surveys detect foundation movement
that may affect integrity.
,6. What does MFL testing detect?
A. Cracks only
B. Wall thickness only
C. Corrosion and metal loss
D. Paint defects
Answer: C
Rationale: Magnetic Flux Leakage detects corrosion and
metal loss in tank bottoms.
7. What is a major safety concern during tank entry?
A. Noise
B. Oxygen deficiency
C. Lighting
D. Heat loss
Answer: B
Rationale: Confined space entry hazards include oxygen
deficiency and toxic gases.
8. Minimum oxygen level for safe entry is typically:
A. 10%
B. 15%
C. 19.5%
D. 25%
Answer: C
Rationale: OSHA defines 19.5% oxygen as the minimum safe
level.
, 9. API 653 inspection interval is based on:
A. Tank color
B. Corrosion rate and service history
C. Operator preference
D. Tank age only
Answer: B
Rationale: Inspection intervals depend on corrosion rate and
service conditions.
10. What is the purpose of a floating roof?
A. Reduce evaporation losses
B. Increase pressure
C. Improve welding
D. Reduce corrosion only
Answer: A
Rationale: Floating roofs reduce vapor emissions and
evaporation losses.
11. Which defect is most critical in welds?
A. Paint blister
B. Crack
C. Rust stain
D. Scale
Answer: B
Rationale: Cracks are critical because they can propagate and
cause failure.
Inspector Certification Exam Prep
Document 2025/2026 | Tank Inspection,
Integrity Management Exam QUESTIONS
AND VERIFIED ACCURATE SOLUTION
(DETAILED & ELABORATED) |GET IT 100%
ACCURATE!! 2026 TEST
1. What is the primary purpose of API 653?
A. Pipeline inspection standards
B. Aboveground storage tank inspection, repair, alteration,
and reconstruction
C. Electrical system design
D. Offshore drilling safety
Answer: B
Rationale: API 653 governs inspection, repair, alteration, and
reconstruction of aboveground storage tanks.
2. Which API standard governs tank design?
A. API 570
B. API 650
C. API 510
D. API 1169
Answer: B
Rationale: API 650 covers design and construction of welded
steel storage tanks.
,3. What is the most common cause of tank bottom failure?
A. Overpressure
B. Corrosion
C. Wind loading
D. Paint failure
Answer: B
Rationale: Corrosion, especially under the tank bottom, is the
leading cause of failure.
4. What is typically used to evaluate bottom thickness?
A. Ultrasonic testing
B. Hydrostatic testing only
C. Radiography only
D. Magnetic particle testing
Answer: A
Rationale: Ultrasonic thickness testing is standard for
measuring plate thickness.
5. What is the main purpose of a tank settlement survey?
A. Measure corrosion
B. Evaluate foundation movement
C. Test weld quality
D. Inspect coating thickness
Answer: B
Rationale: Settlement surveys detect foundation movement
that may affect integrity.
,6. What does MFL testing detect?
A. Cracks only
B. Wall thickness only
C. Corrosion and metal loss
D. Paint defects
Answer: C
Rationale: Magnetic Flux Leakage detects corrosion and
metal loss in tank bottoms.
7. What is a major safety concern during tank entry?
A. Noise
B. Oxygen deficiency
C. Lighting
D. Heat loss
Answer: B
Rationale: Confined space entry hazards include oxygen
deficiency and toxic gases.
8. Minimum oxygen level for safe entry is typically:
A. 10%
B. 15%
C. 19.5%
D. 25%
Answer: C
Rationale: OSHA defines 19.5% oxygen as the minimum safe
level.
, 9. API 653 inspection interval is based on:
A. Tank color
B. Corrosion rate and service history
C. Operator preference
D. Tank age only
Answer: B
Rationale: Inspection intervals depend on corrosion rate and
service conditions.
10. What is the purpose of a floating roof?
A. Reduce evaporation losses
B. Increase pressure
C. Improve welding
D. Reduce corrosion only
Answer: A
Rationale: Floating roofs reduce vapor emissions and
evaporation losses.
11. Which defect is most critical in welds?
A. Paint blister
B. Crack
C. Rust stain
D. Scale
Answer: B
Rationale: Cracks are critical because they can propagate and
cause failure.
