API 653 FORMULAS QUESTIONS AND CORRECT ANSWERS

API 653 FORMULAS QUESTIONS AND CORRECT ANSWERS 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