API 653 Recertification Quiz with
verified questions and answers
Per API 653 , with 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? -
ANSWER✔✔✨---The Shell to bottom joint shall be evaluated for fatigue
When removing an existing tank bottom, all arc-gouged areas of the tank shell-to-bottom shall be: -
ANSWER✔✔✨---examined using magnetic particle inspection, and defective areas repaired and re-
examined.
If RBI assessment has been conducted and the tank has cathodic protection plus a thin-film lining, the
maximum inspection interval is: - ANSWER✔✔✨---14 years
When installing a new nozzle in a tank of unknow material, what stress value should be used to calculate
the required shell thickness and reinforcement? - ANSWER✔✔✨---20,000 lbf/in2
In regards to underside corrosion on tank bottoms, the corrosion rate of steel in a wet environment. -
ANSWER✔✔✨---may double with every 18 °F increase in temperature above 77 °F.
Grade 350W/50W is acceptable for tank plate to a maximum thickness of: - ANSWER✔✔✨---45mm
(1.75in) if fully killed and made to a fine grain practice.
If an RBI assessment has been conducted and the tank has a release prevention barrier, the maximum
initial inspection interval is: - ANSWER✔✔✨---25 years
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? -
ANSWER✔✔✨---API RP 579, section 4, 5 or 6.
verified questions and answers
Per API 653 , with 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? -
ANSWER✔✔✨---The Shell to bottom joint shall be evaluated for fatigue
When removing an existing tank bottom, all arc-gouged areas of the tank shell-to-bottom shall be: -
ANSWER✔✔✨---examined using magnetic particle inspection, and defective areas repaired and re-
examined.
If RBI assessment has been conducted and the tank has cathodic protection plus a thin-film lining, the
maximum inspection interval is: - ANSWER✔✔✨---14 years
When installing a new nozzle in a tank of unknow material, what stress value should be used to calculate
the required shell thickness and reinforcement? - ANSWER✔✔✨---20,000 lbf/in2
In regards to underside corrosion on tank bottoms, the corrosion rate of steel in a wet environment. -
ANSWER✔✔✨---may double with every 18 °F increase in temperature above 77 °F.
Grade 350W/50W is acceptable for tank plate to a maximum thickness of: - ANSWER✔✔✨---45mm
(1.75in) if fully killed and made to a fine grain practice.
If an RBI assessment has been conducted and the tank has a release prevention barrier, the maximum
initial inspection interval is: - ANSWER✔✔✨---25 years
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? -
ANSWER✔✔✨---API RP 579, section 4, 5 or 6.
