API 653 Exam Questions with 100%
Correct Answers
A weld-on patch plate used for repairing a tank bottom shall? - 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? - 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? - 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. - 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? - Answer-Engineer experienced in tank design and evaluation methodologies used.
Flame arrestors should be inspected when? - 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? - 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? - 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? - Answer-12 inches
Surface prep, anchor patterns typically required for coatings are generally how many mils. deep? -
Answer-1.5-4 Mils.
A limitation of PT is that standard penetrant systems are limited to welds having a max temp. of? -
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? - Answer-+/- 10%of full scale
The max deposition rate for pulsed arc transfer mode is? - Answer-About 200 in./min.
Consequence factors to consider in an RBI assessment of a tank include? - Answer-Mode of failure
The pattern of caustic cracking observed on the steel surface appears sometimes as cracks that? -
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? - Answer-Locate leaks by sketch or photo.
Correct Answers
A weld-on patch plate used for repairing a tank bottom shall? - 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? - 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? - 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. - 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? - Answer-Engineer experienced in tank design and evaluation methodologies used.
Flame arrestors should be inspected when? - 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? - 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? - 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? - Answer-12 inches
Surface prep, anchor patterns typically required for coatings are generally how many mils. deep? -
Answer-1.5-4 Mils.
A limitation of PT is that standard penetrant systems are limited to welds having a max temp. of? -
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? - Answer-+/- 10%of full scale
The max deposition rate for pulsed arc transfer mode is? - Answer-About 200 in./min.
Consequence factors to consider in an RBI assessment of a tank include? - Answer-Mode of failure
The pattern of caustic cracking observed on the steel surface appears sometimes as cracks that? -
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? - Answer-Locate leaks by sketch or photo.
