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" What is the required length of RT on a Vert or Horizontal Tank Weld? - ANSWERS 6" What is the required length of RT at Tank Intersections at: Vertical? Horizontal? - ANSWERS 3" on Verts weld seam and 2" on each side of verts If there is a weld defect in a spot RT, how many RTs are required? - ANSWERS 2 unless there is 3" of good weld beyond the defect. Method for RT: RT is shot to____________? - ANSWERS ASME Section V What requirements are needed for Personnel to shoot an RT on a Tank? - ANSWERS ASNT SNT-TC-1A Acceptance Criteria for RT on a tank is? - ANSWERS ASME Section VIII A rounded indication is one that's length is less than or equal to ___________ times its width - ANSWERS 3 times 100% of new vertical welds should be RT'd if the shell thickness is greater than _______________? - ANSWERS 1" How many RT's are needed when a rectangular insert plate is installed in the shell? - ANSWERS 6 RTs Which RT exposure technique is preferred? - ANSWERS Single Wall What is the minimum # of RTs required for a nozzle/pipe butt weld being completed using a double-wall technique with a single view? - ANSWERS 3 - 120 degrees apart What is the minimum # of RTs required for a nozzle/pipe butt weld being RT'd using a double wall technique with a double-wall view? - ANSWERS 2- 0 degree and 90 degree The maximum pipe size when RT'ing a pipe using docuble-wall technique with a double-wall view is _________? - ANSWERS NPS 3 or 3.5" OD