API 653 Aboveground Storage Tank
Inspector 100 Questions And Correct
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Rationales 2026 Q&A Instant
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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
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
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
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
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
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
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
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
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
Hydrostatic testing evaluates a tank's ability to safely contain liquid .
10. According to API 653, what is the maximum interval between external
inspections for an aboveground storage tank in atmospheric service without
a change in service?
A. 5 years
B. 10 years
C. 15 years
Inspector 100 Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant
Download Pdf
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
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
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
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
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
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
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
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
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
Hydrostatic testing evaluates a tank's ability to safely contain liquid .
10. According to API 653, what is the maximum interval between external
inspections for an aboveground storage tank in atmospheric service without
a change in service?
A. 5 years
B. 10 years
C. 15 years
