API 653 Certification Exam Prep Study Guide with
Practice Questions,Detailed Explanations and
Rationale
How does a welder maintain his or her qualification in a particular process?
A) The welder must use the process in Code construction at least once every 12 months
B) The welder must use the process in Code construction at least once every 6 months
C) The welder must use the process at least once every 12 months
D) The welder must use the process at least once every 6 months - ANSWER-D
Why is it recommended that inspectors not walk on insulated roofs?
A) The inspector may damage the insulation
,B) The Insulation may contain hazardous substances
C) The Roof Plates may not be strong enough to support the inspector's weight
D) The inspector may cause indention in the insulation where water can collect - ANSWER-C
If the owner/operator elects to utilize a fitness-for-service evaluation to exempt a repair from
hydrosatic testing, who must perform the evaluation?
A) Fitness-for-service evaluations may not be used to exempt hydrostatic testing following a
repair
B) The authorized Inspector
C) Engineer experienced in storage tank design and the evaluation methods used
D) Exemption of hydrostatic testing for repairs can only be given by the jurisdiction - ANSWER-C
,Tack welds used in the assembly of vertical joints in tank shells may remain in place when the
joints are welded manually provided:
A) They are properly cleaned of all weld slag
B) They are sound
C) Liquid Penetrant or Magnetic Particle examination is performed D) They shall not reamain -
ANSWER-D
New reinforcing plates shall be installed in accordance with Fig 9-3 of API 653. However, in order
to maintain weld spacing, what reinforcing plate is permitted?
A) Oval
B) Diamond
C) Tombstone
D) Circular is the only permitted shape - ANSWER-C
, The owner/operator requires and NPS 3-1/2 nozzle to be installed in an in-service tank. The tank
is 110 feet in diameter, 60 feet maximum fill height, shell thickness at the point of hot tap is
0.75", and the material is of unknown toughness with a minimum design metal temperature of
38 F. This nozzle is to be installed adjacent to an existing nozzle. Using the formula Spacing =
√(RT) what is the minimum spacing between these nozzles?
A) 22.24"
B) 9.08"
C) 19.08"
D) 2.24" - ANSWER-A
What is the maximum surface temperature, of the part being examined, permitted for Magnetic
Particle examination using dry particles?
A) As determined by the particles manufacturer
Practice Questions,Detailed Explanations and
Rationale
How does a welder maintain his or her qualification in a particular process?
A) The welder must use the process in Code construction at least once every 12 months
B) The welder must use the process in Code construction at least once every 6 months
C) The welder must use the process at least once every 12 months
D) The welder must use the process at least once every 6 months - ANSWER-D
Why is it recommended that inspectors not walk on insulated roofs?
A) The inspector may damage the insulation
,B) The Insulation may contain hazardous substances
C) The Roof Plates may not be strong enough to support the inspector's weight
D) The inspector may cause indention in the insulation where water can collect - ANSWER-C
If the owner/operator elects to utilize a fitness-for-service evaluation to exempt a repair from
hydrosatic testing, who must perform the evaluation?
A) Fitness-for-service evaluations may not be used to exempt hydrostatic testing following a
repair
B) The authorized Inspector
C) Engineer experienced in storage tank design and the evaluation methods used
D) Exemption of hydrostatic testing for repairs can only be given by the jurisdiction - ANSWER-C
,Tack welds used in the assembly of vertical joints in tank shells may remain in place when the
joints are welded manually provided:
A) They are properly cleaned of all weld slag
B) They are sound
C) Liquid Penetrant or Magnetic Particle examination is performed D) They shall not reamain -
ANSWER-D
New reinforcing plates shall be installed in accordance with Fig 9-3 of API 653. However, in order
to maintain weld spacing, what reinforcing plate is permitted?
A) Oval
B) Diamond
C) Tombstone
D) Circular is the only permitted shape - ANSWER-C
, The owner/operator requires and NPS 3-1/2 nozzle to be installed in an in-service tank. The tank
is 110 feet in diameter, 60 feet maximum fill height, shell thickness at the point of hot tap is
0.75", and the material is of unknown toughness with a minimum design metal temperature of
38 F. This nozzle is to be installed adjacent to an existing nozzle. Using the formula Spacing =
√(RT) what is the minimum spacing between these nozzles?
A) 22.24"
B) 9.08"
C) 19.08"
D) 2.24" - ANSWER-A
What is the maximum surface temperature, of the part being examined, permitted for Magnetic
Particle examination using dry particles?
A) As determined by the particles manufacturer
