API 653 EXAM 1 QUESTIONS AND ANSWERS 2024

Who Determines to use RBI methodologies? - ANSWERS Owner/Operator RBI Document - API Code? - ANSWERS API 580 What are the two factors of Risk? - ANSWERS Consequence of failure and Likelihood of Failure RBI Assessments must be thoroughly___________? - ANSWERS Documented Who conducts an RBI Assessment? - ANSWERS Team of Knowledgeable of RBI Principles RBI Assessments shall be repeated at least every ______ Years? - ANSWERS 10 years Two Primary Factors of Consequence of Failure are? - ANSWERS Product Type and Volume Minimum thickness of a NEW tank bottom plate? - ANSWERS 0.250" Minimum thickness of an existing tank bottom plate without coating or detection/contain leak? - ANSWERS 0.100" Minimum thickness of an existing tank bottom plate with a thick reinforced coating (50 mils) - ANSWERS 0.050" Minimum thickness of an existing tank bottom plate with detection and contain a leak? - ANSWERS 0.050" Typical Shell Floor plates are welded how? - ANSWERS Lap Welded Annular Shell floor plates are welded how? - ANSWERS Butt Welded Minimum size of a new bottom fillet weld? - ANSWERS Full fillet Three-plate Laps must be ______ inches from everything else? - ANSWERS 12" What is the minimum radial width of an annular plate? (Shell to nearest Lap Weld) - ANSWERS 24" What is the minimum width of a bottom plate extension on outside of shell? (Answer for both New & Existing) - ANSWERS New - 2", Existing - 3/8" What is the minimum thickness allowed of an existing bottom plate extension at the shell-bottom weld? - ANSWERS 0.100" Most existing tank bottoms are inspected with _________. Areas of concern found are normally checked with ____________. - ANSWERS MFL, UT What is the width of the Critical Zone on existing tank bottoms? - ANSWERS 3" What is the minimum thickness of an existing tank bottom in a Critical Zone? - ANSWERS Less of 1/2 of original floor or. 1/2 T-min of 1st Shell Course, Typically it is 0.125"