API 653 Exam Prep | Comprehensive
Study Guide | 2026/2027
A weld-on patch plate used for repairing a tank bottom shall? - correct answer-
Never be placed over an area of global dishing.
New welds attaching existing shell plates to existing or new shell plates should
follow what two inspection methods? - correct answer-Visual and RT
When a tank bottom is removed by using arc-gauging, the areas of the tanks shell-
to- bottom weld shall be? - correct answer-Magnetic-particle examined and
defective areas repaired and re-examined
At what frequency shall visible and fluorescent light meters used with liquid
penetrant testing be calibrated. - correct answer-A min. of once a year.
Fitness for service evaluations may be used to exempt a repair from hydrostatic
testing if performed by a? - correct answer-Engineer experienced in tank design
and evaluation methodologies used.
,Flame arrestors should be inspected when? - correct answer-At appropriate
intervals.
When corrosion is found on the underside of a tank roof and the top side of the
tank shell, structural members such as roof girders and rafters will most likely be
thinning at what rate? - correct answer-Twice the rate of the roof or shell.
Assessment of internal tank settlement requires placement of measurement
points across the tank diameter at intervals of not more than? - correct answer-
10 feet
In a API standard 653 repair a replacement plate meets but does not cross a
horizontal weld. prior to welding of a new vertical joint the horizontal weld should
be cut beyond the new vertical joint at min. length of? - correct answer-12 inches
Surface prep, anchor patterns typically required for coatings are generally how
many mils. deep? - correct answer-1.5-4 Mils.
A limitation of PT is that standard penetrant systems are limited to welds having a
max temp. of? - correct answer-125°F
In calibrating magnetizing equipment ammeter, what is the max deviation
allowed relative to the actual current value as shown by the test meter? - correct
answer-+/- 10%of full scale
The max deposition rate for pulsed arc transfer mode is? - correct answer-About
200 in./min.
, Consequence factors to consider in an RBI assessment of a tank include? - correct
answer-Mode of failure
The pattern of caustic cracking observed on the steel surface appears sometimes
as cracks that? - correct answer-Have spider-web appearance initiating at weld
flaws.
When a in-service tank inspection is performed, what is the recommended
method of documenting leaks on a riveted shell? - correct answer-Locate leaks by
sketch or photo.
An example of a non-essential variable for a tank bottom scanner qualification
test is? - correct answer-Plate cleanliness.
The annual cathodic protection surveys for a impressed current system may? -
correct answer-Include one or more electrical measurements performed
previously in the initial survey.
For tank repairs, safeguards for personal health and safety, and prevention of
property damage shall be developed to the guidelines given in which standard. -
correct answer-API 2015 and API 2217A
How far beyond the outer periphery of the foundation ring wall should the drip
ring extend? - correct answer-3 inches
An examiner must be able to determine flaw depth in thin film coatings to what
degree of accuracy? - correct answer-+/- .030
Study Guide | 2026/2027
A weld-on patch plate used for repairing a tank bottom shall? - correct answer-
Never be placed over an area of global dishing.
New welds attaching existing shell plates to existing or new shell plates should
follow what two inspection methods? - correct answer-Visual and RT
When a tank bottom is removed by using arc-gauging, the areas of the tanks shell-
to- bottom weld shall be? - correct answer-Magnetic-particle examined and
defective areas repaired and re-examined
At what frequency shall visible and fluorescent light meters used with liquid
penetrant testing be calibrated. - correct answer-A min. of once a year.
Fitness for service evaluations may be used to exempt a repair from hydrostatic
testing if performed by a? - correct answer-Engineer experienced in tank design
and evaluation methodologies used.
,Flame arrestors should be inspected when? - correct answer-At appropriate
intervals.
When corrosion is found on the underside of a tank roof and the top side of the
tank shell, structural members such as roof girders and rafters will most likely be
thinning at what rate? - correct answer-Twice the rate of the roof or shell.
Assessment of internal tank settlement requires placement of measurement
points across the tank diameter at intervals of not more than? - correct answer-
10 feet
In a API standard 653 repair a replacement plate meets but does not cross a
horizontal weld. prior to welding of a new vertical joint the horizontal weld should
be cut beyond the new vertical joint at min. length of? - correct answer-12 inches
Surface prep, anchor patterns typically required for coatings are generally how
many mils. deep? - correct answer-1.5-4 Mils.
A limitation of PT is that standard penetrant systems are limited to welds having a
max temp. of? - correct answer-125°F
In calibrating magnetizing equipment ammeter, what is the max deviation
allowed relative to the actual current value as shown by the test meter? - correct
answer-+/- 10%of full scale
The max deposition rate for pulsed arc transfer mode is? - correct answer-About
200 in./min.
, Consequence factors to consider in an RBI assessment of a tank include? - correct
answer-Mode of failure
The pattern of caustic cracking observed on the steel surface appears sometimes
as cracks that? - correct answer-Have spider-web appearance initiating at weld
flaws.
When a in-service tank inspection is performed, what is the recommended
method of documenting leaks on a riveted shell? - correct answer-Locate leaks by
sketch or photo.
An example of a non-essential variable for a tank bottom scanner qualification
test is? - correct answer-Plate cleanliness.
The annual cathodic protection surveys for a impressed current system may? -
correct answer-Include one or more electrical measurements performed
previously in the initial survey.
For tank repairs, safeguards for personal health and safety, and prevention of
property damage shall be developed to the guidelines given in which standard. -
correct answer-API 2015 and API 2217A
How far beyond the outer periphery of the foundation ring wall should the drip
ring extend? - correct answer-3 inches
An examiner must be able to determine flaw depth in thin film coatings to what
degree of accuracy? - correct answer-+/- .030
