API 653 Aboveground Storage Tank Inspector
Certification Exam Prep Document 2026/2027 | Tank
Inspection, Integrity Management & Industry Codes
100 Verified Questions with Detailed Rationales
1. What is the primary purpose of API 653?
A. Design new storage tanks
B. Inspect, repair, alter, and reconstruct aboveground storage tanks
C. Regulate pipeline operations
D. Certify welding consumables
✅ Correct Answer: B
Rationale: API 653 establishes requirements for inspection, repair, alteration, and reconstruction
of aboveground storage tanks after they have been placed in service.
2. API 653 applies primarily to tanks built according to which standard?
A. API 620 only
B. API 650 and its predecessor standards
C. ASME Section VIII
D. NFPA 30 only
✅ Correct Answer: B
Rationale: API 653 covers tanks constructed to API 650 and predecessor standards such as API
12C.
3. The minimum required thickness of a tank shell is determined primarily by:
,A. Paint condition
B. Corrosion rate and design requirements
C. Color of the tank
D. Foundation type only
✅ Correct Answer: B
Rationale: Remaining shell thickness must satisfy structural requirements while accounting for
corrosion.
4. Which inspection method is commonly used to measure tank shell thickness?
A. Dye penetrant testing
B. Magnetic particle testing
C. Ultrasonic thickness testing (UT)
D. Radiographic film only
✅ Correct Answer: C
Rationale: UT is the most common method for measuring remaining wall thickness.
5. An authorized API 653 inspector is responsible for:
A. Designing foundations
B. Performing fitness-for-service evaluations only
C. Determining inspection requirements and evaluating results
D. Manufacturing tank plates
✅ Correct Answer: C
Rationale: Authorized inspectors evaluate inspection findings and determine compliance with
API 653.
6. What is the primary purpose of an external visual inspection?
A. Measure shell thickness directly
B. Identify visible signs of deterioration or damage
C. Replace UT inspections
D. Determine steel chemistry
, ✅ Correct Answer: B
Rationale: Visual inspections identify corrosion, distortion, leaks, settlement, and coating
failures.
7. Settlement of a storage tank may result in:
A. Improved tank strength
B. Shell distortion and excessive stresses
C. Reduced corrosion rates
D. Increased coating life
✅ Correct Answer: B
Rationale: Uneven settlement can create structural stresses and deformation.
8. Which NDE method is best suited for detecting surface cracks in ferromagnetic
materials?
A. Ultrasonic testing
B. Vacuum box testing
C. Magnetic particle testing (MT)
D. Hydrostatic testing
✅ Correct Answer: C
Rationale: MT effectively detects surface and near-surface discontinuities in ferromagnetic
materials.
9. A hydrostatic test is primarily used to:
A. Verify leak-tightness and structural integrity
B. Determine corrosion rates
C. Measure coating thickness
D. Assess cathodic protection performance
✅ Correct Answer: A
Rationale: Hydrostatic testing evaluates a tank's ability to safely contain liquid.
Certification Exam Prep Document 2026/2027 | Tank
Inspection, Integrity Management & Industry Codes
100 Verified Questions with Detailed Rationales
1. What is the primary purpose of API 653?
A. Design new storage tanks
B. Inspect, repair, alter, and reconstruct aboveground storage tanks
C. Regulate pipeline operations
D. Certify welding consumables
✅ Correct Answer: B
Rationale: API 653 establishes requirements for inspection, repair, alteration, and reconstruction
of aboveground storage tanks after they have been placed in service.
2. API 653 applies primarily to tanks built according to which standard?
A. API 620 only
B. API 650 and its predecessor standards
C. ASME Section VIII
D. NFPA 30 only
✅ Correct Answer: B
Rationale: API 653 covers tanks constructed to API 650 and predecessor standards such as API
12C.
3. The minimum required thickness of a tank shell is determined primarily by:
,A. Paint condition
B. Corrosion rate and design requirements
C. Color of the tank
D. Foundation type only
✅ Correct Answer: B
Rationale: Remaining shell thickness must satisfy structural requirements while accounting for
corrosion.
4. Which inspection method is commonly used to measure tank shell thickness?
A. Dye penetrant testing
B. Magnetic particle testing
C. Ultrasonic thickness testing (UT)
D. Radiographic film only
✅ Correct Answer: C
Rationale: UT is the most common method for measuring remaining wall thickness.
5. An authorized API 653 inspector is responsible for:
A. Designing foundations
B. Performing fitness-for-service evaluations only
C. Determining inspection requirements and evaluating results
D. Manufacturing tank plates
✅ Correct Answer: C
Rationale: Authorized inspectors evaluate inspection findings and determine compliance with
API 653.
6. What is the primary purpose of an external visual inspection?
A. Measure shell thickness directly
B. Identify visible signs of deterioration or damage
C. Replace UT inspections
D. Determine steel chemistry
, ✅ Correct Answer: B
Rationale: Visual inspections identify corrosion, distortion, leaks, settlement, and coating
failures.
7. Settlement of a storage tank may result in:
A. Improved tank strength
B. Shell distortion and excessive stresses
C. Reduced corrosion rates
D. Increased coating life
✅ Correct Answer: B
Rationale: Uneven settlement can create structural stresses and deformation.
8. Which NDE method is best suited for detecting surface cracks in ferromagnetic
materials?
A. Ultrasonic testing
B. Vacuum box testing
C. Magnetic particle testing (MT)
D. Hydrostatic testing
✅ Correct Answer: C
Rationale: MT effectively detects surface and near-surface discontinuities in ferromagnetic
materials.
9. A hydrostatic test is primarily used to:
A. Verify leak-tightness and structural integrity
B. Determine corrosion rates
C. Measure coating thickness
D. Assess cathodic protection performance
✅ Correct Answer: A
Rationale: Hydrostatic testing evaluates a tank's ability to safely contain liquid.
