API 653 Exam Questions And Correct
Answers
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" - CORRECT ANSWER>>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 - CORRECT ANSWER>>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%. - CORRECT
ANSWER>>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 - CORRECT ANSWER>>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" - CORRECT ANSWER>>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"
C. 25"
D. 40" - CORRECT ANSWER>>B. 24"
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 required thickness "tmin" in this corroded area?
A. 0.407"
B. 0.418"
C. 0.452"
D. 0.464"
E. 0.492" - CORRECT ANSWER>>B. 0.418"
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".
API 653 sets a limit on the thickness of "t2". In order to provide a 10 year run,
what is the minimum thickness that "t2" can be during this inspection?
A. 0.211"
B. 0.251"
C. 0.281"
D. 0.301"
Answers
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" - CORRECT ANSWER>>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 - CORRECT ANSWER>>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%. - CORRECT
ANSWER>>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 - CORRECT ANSWER>>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" - CORRECT ANSWER>>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"
C. 25"
D. 40" - CORRECT ANSWER>>B. 24"
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 required thickness "tmin" in this corroded area?
A. 0.407"
B. 0.418"
C. 0.452"
D. 0.464"
E. 0.492" - CORRECT ANSWER>>B. 0.418"
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".
API 653 sets a limit on the thickness of "t2". In order to provide a 10 year run,
what is the minimum thickness that "t2" can be during this inspection?
A. 0.211"
B. 0.251"
C. 0.281"
D. 0.301"
