API 653 RECERTIFICATION QUIZ
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? - 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: - 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: - 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? - 20,000 lbf/in2
In regards to underside corrosion on tank bottoms, the corrosion rate of steel in a
wet environment. - 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: - 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: - 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? - API RP 579, section 4, 5 or 6.
