API 653 Closed Book Exam Mastery Guide: Aboveground Storage Tank
(AST) Inspection, API 650 Construction Standards, Shell-to-Bottom Weld
Integrity, Tank Bottom Corrosion Assessment, Cathodic Protection
Systems, Release Prevention Barriers (RPB), Risk-Based Inspection (RBI)
Methodology, Storage Tank Engineer Responsibilities, Authorized
Inspector Duties, Fitness-for-Service (API 579) Evaluation, Hydrostatic
Testing Procedures, Settlement Analysis, Nozzle Insert Plate Design, Shell
Reinforcement Calculations, Weld Procedure Specification (WPS),
Procedure Qualification Record (PQR), Welder Performance Qualification
(WPQ), Nondestructive Examination (RT, UT, MT, PT), Vacuum Box Testing,
Radiographic IQI Standards, Controlled Deposition Welding Techniques,
Post Weld Heat Treatment (PWHT) Alternatives, Lapped Patch Repairs,
Flange and Nozzle Installation Rules, Structural Integrity and Fatigue
Analysis, Corrosion Rate Determination, Material Selection and Toughness
Requirements, API 2201 Hot Tapping Safety, API 578 Material Verification
Exam Questions Verified and Provided with Complete A+ Graded Answers
Latest Updated 2026
An insert plate is required for a new 4 NPS nozzle (4.5" O.D.) in the shell. What is the minimum
diameter for this insert?
A. 4.5"
B. 9"
C. 12"
D. 16.5"
D. 16.5"
,A welder is qualified on a plate in the 3G position. The welder is qualified for what fillet weld
position(s)?
A. None
B. F, H
C. F, H, V
D. All fillets
C. F, H, V
When must a shim be placed under an Image Quality Indicator?
A. When the area of interest is darker.
B. When the area of interest is darker by more than 15%.
C. When the area of interest is lighter
D. When the area of interest is lighter by more than 15%.
D. When the area of interest is lighter by more than 15%.
A welder passes a qualification test using a 3 NPS pipe with a groove weld. What is the
maximum pipe diameter that the welder is now qualified to weld?
A. 2-7/8"
B. 4"
C. 8"
D. Unlimited
D. Unlimited
, A portion of a 1/2" thick shell plate is replaced. What is the closest distance allowed between
this plate and the adjacent vertical weld?
A. 3"
B. 6"
C. 10"
D. 12"
B. 6"
Tank Number: T-100
Diameter: 114'
Specific Gravity: 0.9
Plate Material: A-283 gr C
Shell Corrosion Rate: 0.003"/yr
Allowable Liquid Height: 40'
Construction Code: API 650 4th Edition
A corroded area is found 3' from the bottom and 4" from the nearest weld. The lowest reading
in the locally corroded area is 0.368".
What is the critical length "L" in the corroded area?
A. 12"
B. 24"
(AST) Inspection, API 650 Construction Standards, Shell-to-Bottom Weld
Integrity, Tank Bottom Corrosion Assessment, Cathodic Protection
Systems, Release Prevention Barriers (RPB), Risk-Based Inspection (RBI)
Methodology, Storage Tank Engineer Responsibilities, Authorized
Inspector Duties, Fitness-for-Service (API 579) Evaluation, Hydrostatic
Testing Procedures, Settlement Analysis, Nozzle Insert Plate Design, Shell
Reinforcement Calculations, Weld Procedure Specification (WPS),
Procedure Qualification Record (PQR), Welder Performance Qualification
(WPQ), Nondestructive Examination (RT, UT, MT, PT), Vacuum Box Testing,
Radiographic IQI Standards, Controlled Deposition Welding Techniques,
Post Weld Heat Treatment (PWHT) Alternatives, Lapped Patch Repairs,
Flange and Nozzle Installation Rules, Structural Integrity and Fatigue
Analysis, Corrosion Rate Determination, Material Selection and Toughness
Requirements, API 2201 Hot Tapping Safety, API 578 Material Verification
Exam Questions Verified and Provided with Complete A+ Graded Answers
Latest Updated 2026
An insert plate is required for a new 4 NPS nozzle (4.5" O.D.) in the shell. What is the minimum
diameter for this insert?
A. 4.5"
B. 9"
C. 12"
D. 16.5"
D. 16.5"
,A welder is qualified on a plate in the 3G position. The welder is qualified for what fillet weld
position(s)?
A. None
B. F, H
C. F, H, V
D. All fillets
C. F, H, V
When must a shim be placed under an Image Quality Indicator?
A. When the area of interest is darker.
B. When the area of interest is darker by more than 15%.
C. When the area of interest is lighter
D. When the area of interest is lighter by more than 15%.
D. When the area of interest is lighter by more than 15%.
A welder passes a qualification test using a 3 NPS pipe with a groove weld. What is the
maximum pipe diameter that the welder is now qualified to weld?
A. 2-7/8"
B. 4"
C. 8"
D. Unlimited
D. Unlimited
, A portion of a 1/2" thick shell plate is replaced. What is the closest distance allowed between
this plate and the adjacent vertical weld?
A. 3"
B. 6"
C. 10"
D. 12"
B. 6"
Tank Number: T-100
Diameter: 114'
Specific Gravity: 0.9
Plate Material: A-283 gr C
Shell Corrosion Rate: 0.003"/yr
Allowable Liquid Height: 40'
Construction Code: API 650 4th Edition
A corroded area is found 3' from the bottom and 4" from the nearest weld. The lowest reading
in the locally corroded area is 0.368".
What is the critical length "L" in the corroded area?
A. 12"
B. 24"
