API 653 Test Questions and Answers-
FORMULAS
Linings- Typically anchor profile of steel surface required for the installation of a tank bottom lining 652:
7.5 - Answer-1.5-4.0 mils
Welds- Maximum undercut of a vertical weld & nozzle weld 650: 8.5.2.b - Answer-1/64"
Welds- Maximum undercut of a horizontal weld 650: 8.5.2.b - Answer-1/32"
Welds- Maximum diameter of a surface porosity cluster 650: 8.5.2.c - Answer-3/32"
Weld Qualification- Max allowed discontinuity in a bend test IX: QW-163 - Answer-1/8"
Nameplates- Minimum size of name plate letters 650: 10.1.1 & 653: 13.1.1.1 - Answer-5/32"
Bottoms- Minimum external projection of bottom plate on an existing tank (from toe of shell-to-bottom
FW) 653: 4.4.5.7 - Answer-3/8"
,Reconstruction- Max amount of peaking allowed in vertical welds 653: 10.5.4 - Answer-1/2"
Shell Calcs- When calculating tmin for shell LTA, minimum distance away from a weld where "E" is
always 1.0 653: 4.3.3.1 (definitions) - Answer-> 1" or 2t
Shell Patch- Minimum overlap of shell lap-patch used to cover a hole (edge of hole to edge of patch)
653: 9.3.2.3 - Answer-1"
NDE- When performing a PT examination, minimum distance to clean beyond the area to be examined
V: T-642.b - Answer-1"
NDE- When performing a MT examination, minimum distance to clean beyond the area to be examined
V: T-741.1.b - Answer-1"
Reconstruction- Maximum amount of banding allowed in a horizontal weld 653: 10.5.5 - Answer-1"
Bottoms- Minimum overlap required for single-welded lap joints 650: 5.1.3.5 - Answer-1"
Bottoms- Minimum external projection of bottom plate on a new tank 650: 5.4.2 - Answer-2"
Vacuum Box- Minimum overlap of previously test surfaces when using a vacuum box 650: 8.6.5 -
Answer-2"
Bottom Patch- Minimum overlap of bottom lap-patch fillet weld to the nearest existing bottom weld
653: Fig. 9.13 - Answer-2"
Bottom Patch- Minimum distance bottom lap-patch fillet weld to the nearest existing bottom weld 653:
Fig. 9.13 - Answer-2"
, Shell Patch- Minimum radius of a shell lap-patch
653: 9.3.1.4 - Answer-2"
Reconstruction- If reusing bottom plates, minimum distance to cut from existing bottom welds (if plates
are not deseamed) 653: 10.3.2.1 - Answer-2"
Reconstruction- If reusing roof plates, minimum distance to cut from existing roof welds (if plates are
not deseamed) 653: 10.3.4.1 - Answer-2"
Shell Pitting- Maximum allowed vertical length of pits on a tank shell 653: 4.3.2.2.b - Answer-2" in 8"
line
Bottom Pitting- Maximum allowed length of pits in the critical zone that can be repaired by weld-buildup
653: 9.10.1.6.a - Answer-2" in 8" arc
Bottoms- Radial length of critical zone measured from shell 653: 3.10 - Answer-3"
Bottoms- Suggested sand pad thickness 650: B.3.2 - Answer-3-4"
Welds- Minimum distance between clusters of surface porosity 650: 8.5.2.c - Answer-4"
Shell Patch- Minimum dimension of a shell lap-patch 653: 9.3.1.7 - Answer-4"
Shell Patch- Minimum radius of a shell flush-patch 653: Fig. 9.1 "R" dimension - Answer-6"
FORMULAS
Linings- Typically anchor profile of steel surface required for the installation of a tank bottom lining 652:
7.5 - Answer-1.5-4.0 mils
Welds- Maximum undercut of a vertical weld & nozzle weld 650: 8.5.2.b - Answer-1/64"
Welds- Maximum undercut of a horizontal weld 650: 8.5.2.b - Answer-1/32"
Welds- Maximum diameter of a surface porosity cluster 650: 8.5.2.c - Answer-3/32"
Weld Qualification- Max allowed discontinuity in a bend test IX: QW-163 - Answer-1/8"
Nameplates- Minimum size of name plate letters 650: 10.1.1 & 653: 13.1.1.1 - Answer-5/32"
Bottoms- Minimum external projection of bottom plate on an existing tank (from toe of shell-to-bottom
FW) 653: 4.4.5.7 - Answer-3/8"
,Reconstruction- Max amount of peaking allowed in vertical welds 653: 10.5.4 - Answer-1/2"
Shell Calcs- When calculating tmin for shell LTA, minimum distance away from a weld where "E" is
always 1.0 653: 4.3.3.1 (definitions) - Answer-> 1" or 2t
Shell Patch- Minimum overlap of shell lap-patch used to cover a hole (edge of hole to edge of patch)
653: 9.3.2.3 - Answer-1"
NDE- When performing a PT examination, minimum distance to clean beyond the area to be examined
V: T-642.b - Answer-1"
NDE- When performing a MT examination, minimum distance to clean beyond the area to be examined
V: T-741.1.b - Answer-1"
Reconstruction- Maximum amount of banding allowed in a horizontal weld 653: 10.5.5 - Answer-1"
Bottoms- Minimum overlap required for single-welded lap joints 650: 5.1.3.5 - Answer-1"
Bottoms- Minimum external projection of bottom plate on a new tank 650: 5.4.2 - Answer-2"
Vacuum Box- Minimum overlap of previously test surfaces when using a vacuum box 650: 8.6.5 -
Answer-2"
Bottom Patch- Minimum overlap of bottom lap-patch fillet weld to the nearest existing bottom weld
653: Fig. 9.13 - Answer-2"
Bottom Patch- Minimum distance bottom lap-patch fillet weld to the nearest existing bottom weld 653:
Fig. 9.13 - Answer-2"
, Shell Patch- Minimum radius of a shell lap-patch
653: 9.3.1.4 - Answer-2"
Reconstruction- If reusing bottom plates, minimum distance to cut from existing bottom welds (if plates
are not deseamed) 653: 10.3.2.1 - Answer-2"
Reconstruction- If reusing roof plates, minimum distance to cut from existing roof welds (if plates are
not deseamed) 653: 10.3.4.1 - Answer-2"
Shell Pitting- Maximum allowed vertical length of pits on a tank shell 653: 4.3.2.2.b - Answer-2" in 8"
line
Bottom Pitting- Maximum allowed length of pits in the critical zone that can be repaired by weld-buildup
653: 9.10.1.6.a - Answer-2" in 8" arc
Bottoms- Radial length of critical zone measured from shell 653: 3.10 - Answer-3"
Bottoms- Suggested sand pad thickness 650: B.3.2 - Answer-3-4"
Welds- Minimum distance between clusters of surface porosity 650: 8.5.2.c - Answer-4"
Shell Patch- Minimum dimension of a shell lap-patch 653: 9.3.1.7 - Answer-4"
Shell Patch- Minimum radius of a shell flush-patch 653: Fig. 9.1 "R" dimension - Answer-6"
