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API 653 Recertification Quiz with 100% Correct
Question 1: Per API 653, which of the following is
required when converting an existing tank to operation at elevated temperatures when it was not originally designed and constructed to API 650, Appendix M?
CORRECT ANSWER: The Shell to bottom joint shall
be evaluated for fatigue
Question 2: When removing an existing tank bottom, all
arc-gouged areas of the tank shell-to-bottom shall be:
CORRECT ANSWER: examined using magnetic
particle inspection, and defective areas repaired and re- examined
Question 3: If RBI assessment has been conducted and
the tank has cathodic protection plus a thin-film lining,
the maximum inspection interval is:
CORRECT ANSWER: 14 years
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Question 4: When installing a new nozzle in a tank of
unknown material, what stress value should be used to calculate the required shell thickness and reinforcement?
CORRECT ANSWER: 20,000 lbf/in2
Question 5: In regards to underside corrosion on tank
bottoms, the corrosion rate of steel in a wet environment:
CORRECT ANSWER: may double with every 18 °F
increase in temperature above 77 °F
Question 6: Grade 350W/50W is acceptable for tank plate
to a maximum thickness of:
CORRECT ANSWER: 45mm (1.75in) if fully killed
and made to a fine grain practice
Question 7: If an RBI assessment has been conducted and
the tank has a release prevention barrier, the maximum
initial inspection interval is:
CORRECT ANSWER: 25 years
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Question 8: As an alternative to the procedures in API
653 for the evaluation of any thinning of the tank shell below minimum required wall thickness may be evaluated for continued service using which code?
CORRECT ANSWER: API RP 579, section 4, 5 or 6
Question 9: When welding on a tank shell constructed of
Group I steel that is greater than 1.5 inches thick below what minimum metal temperature? preheat?
CORRECT ANSWER: 200°F
Question 10: When evaluated an existing temperature
services tank, which has a successful service history of operation but was not originally designed and constructed to the requirement of API 650, appendix M, which condition temperature has to be used?
CORRECT ANSWER: The max Operating Temperature
shall not exceed the temperature at which the tank has successfully operated in the past
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Question 11: Flange material used for tank repair and
alteration shall meet the minimum requirements for the
material specifications according to:
CORRECT ANSWER: The as built standard
Question 12: Which is an advantage of thick film UN-
REINFORCED linings?
CORRECT ANSWER: Fast curing and can be put back
in service after 24 hours at normal ambient temperature
Question 13: The perimeter welds on a welded-on patch
plate in the critical zone should be?
CORRECT ANSWER: Two-pass and examined visually
and by either MP or PT
Question 14: Existent welds on a tank shell are found to
be closer than allowed by API 650 (7th Edition). Under what conditions can these welds be considered to be acceptable for continued service?
CORRECT ANSWER: Examined by MP inspection
with no rejectable indications