API 653 Test Questions and Correct
Answers
Who Determines to use RBI methodologies? - Answer-Owner/Operator
RBI Document - API Code? - Answer-API 580
What are the two factors of Risk? - Answer-Consequence of failure and Likelihood of Failure
RBI Assessments must be thoroughly___________? - Answer-Documented
Who conducts an RBI Assessment? - Answer-Team of Knowledgeable of RBI Principles
RBI Assessments shall be repeated at least every ______ Years? - Answer-10 years
Two Primary Factors of Consequence of Failure are? - Answer-Product Type and Volume
Minimum thickness of a NEW tank bottom plate? - Answer-0.250"
,Minimum thickness of an existing tank bottom plate without coating or detection/contain leak? -
Answer-0.100"
Minimum thickness of an existing tank bottom plate with a thick reinforced coating (>50 mils) - Answer-
0.050"
Minimum thickness of an existing tank bottom plate with detection and contain a leak? - Answer-0.050"
Typical Shell Floor plates are welded how? - Answer-Lap Welded
Annular Shell floor plates are welded how? - Answer-Butt Welded
Minimum size of a new bottom fillet weld? - Answer-Full fillet
Three-plate Laps must be ______ inches from everything else? - Answer-12"
What is the minimum radial width of an annular plate? (Shell to nearest Lap Weld) - Answer-24"
What is the minimum width of a bottom plate extension on outside of shell? (Answer for both New &
Existing) - Answer-New - 2", Existing - 3/8"
What is the minimum thickness allowed of an existing bottom plate extension at the shell-bottom weld?
- Answer-0.100"
Most existing tank bottoms are inspected with _________. Areas of concern found are normally checked
with ____________. - Answer-MFL, UT
, What is the width of the Critical Zone on existing tank bottoms? - Answer-3"
What is the minimum thickness of an existing tank bottom in a Critical Zone? - Answer-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? - Answer-6"
What is the required length of RT at Tank Intersections at:
Vertical? Horizontal? - Answer-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? - Answer-2 unless there is 3" of good
weld beyond the defect.
Method for RT: RT is shot to____________? - Answer-ASME Section V
What requirements are needed for Personnel to shoot an RT on a Tank? - Answer-ASNT SNT-TC-1A
Acceptance Criteria for RT on a tank is? - Answer-ASME Section VIII
A rounded indication is one that's length is less than or equal to ___________ times its width - Answer-
3 times
100% of new vertical welds should be RT'd if the shell thickness is greater than _______________? -
Answer-1"
How many RT's are needed when a rectangular insert plate is installed in the shell? - Answer-6 RTs
Answers
Who Determines to use RBI methodologies? - Answer-Owner/Operator
RBI Document - API Code? - Answer-API 580
What are the two factors of Risk? - Answer-Consequence of failure and Likelihood of Failure
RBI Assessments must be thoroughly___________? - Answer-Documented
Who conducts an RBI Assessment? - Answer-Team of Knowledgeable of RBI Principles
RBI Assessments shall be repeated at least every ______ Years? - Answer-10 years
Two Primary Factors of Consequence of Failure are? - Answer-Product Type and Volume
Minimum thickness of a NEW tank bottom plate? - Answer-0.250"
,Minimum thickness of an existing tank bottom plate without coating or detection/contain leak? -
Answer-0.100"
Minimum thickness of an existing tank bottom plate with a thick reinforced coating (>50 mils) - Answer-
0.050"
Minimum thickness of an existing tank bottom plate with detection and contain a leak? - Answer-0.050"
Typical Shell Floor plates are welded how? - Answer-Lap Welded
Annular Shell floor plates are welded how? - Answer-Butt Welded
Minimum size of a new bottom fillet weld? - Answer-Full fillet
Three-plate Laps must be ______ inches from everything else? - Answer-12"
What is the minimum radial width of an annular plate? (Shell to nearest Lap Weld) - Answer-24"
What is the minimum width of a bottom plate extension on outside of shell? (Answer for both New &
Existing) - Answer-New - 2", Existing - 3/8"
What is the minimum thickness allowed of an existing bottom plate extension at the shell-bottom weld?
- Answer-0.100"
Most existing tank bottoms are inspected with _________. Areas of concern found are normally checked
with ____________. - Answer-MFL, UT
, What is the width of the Critical Zone on existing tank bottoms? - Answer-3"
What is the minimum thickness of an existing tank bottom in a Critical Zone? - Answer-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? - Answer-6"
What is the required length of RT at Tank Intersections at:
Vertical? Horizontal? - Answer-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? - Answer-2 unless there is 3" of good
weld beyond the defect.
Method for RT: RT is shot to____________? - Answer-ASME Section V
What requirements are needed for Personnel to shoot an RT on a Tank? - Answer-ASNT SNT-TC-1A
Acceptance Criteria for RT on a tank is? - Answer-ASME Section VIII
A rounded indication is one that's length is less than or equal to ___________ times its width - Answer-
3 times
100% of new vertical welds should be RT'd if the shell thickness is greater than _______________? -
Answer-1"
How many RT's are needed when a rectangular insert plate is installed in the shell? - Answer-6 RTs
