-
Linings- Typically anchor profile of steel surface required for the installation of a tank bottom lining 652: 7.5
1.5-4.0 mils
-
Welds- Maximum undercut of a vertical weld & nozzle weld 650: 8.5.2.b
1/64"
-
Welds- Maximum undercut of a horizontal weld
-
Welds- Maximum diameter of a surface porosity cluster 650: 8.5.2.c
3/32"
-
Weld Qualification- Max allowed discontinuity in a bend test IX: QW-163
1/8"
-
Nameplates- Minimum size of name plate letters 650: 10.1.1 & 653: 13.1.1.1
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
3/8"
-
Reconstruction- Max amount of peaking allowed in vertical welds 653: 10.5.4
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)
> 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
1"
-
NDE- When performing a PT examination, minimum distance to clean beyond the area to be examined V: T-642.b
1"
-
NDE- When performing a MT examination, minimum distance to clean beyond the area to be examined V: T-741.1.b
1"
-
Reconstruction- Maximum amount of banding allowed in a horizontal weld 653: 10.5.5
1"
-
Bottoms- Minimum overlap required for single-welded lap joints 650: 5.1.3.5
1"
-
Bottoms- Minimum external projection of bottom plate on a new tank 650: 5.4.2
2"
-
Vacuum Box- Minimum overlap of previously test surfaces when using a vacuum box
-
Bottom Patch- Minimum overlap of bottom lap-patch fillet weld to the nearest existing bottom weld 653: Fig. 9.13
2"
-
Bottom Patch- Minimum distance bottom lap-patch fillet weld to the nearest existing bottom weld 653: Fig. 9.13
2"
-
Shell Patch- Minimum radius of a shell lap-patch 653: 9.3.1.4
2"
-
Reconstruction- If reusing bottom plates, minimum distance to cut from existing bottom welds (if plates are not deseamed)
-
Reconstruction- If reusing roof plates, minimum distance to cut from existing roof welds (if plates are not deseamed)
-
Shell Pitting- Maximum allowed vertical length of pits on a tank shell 653: 4.3.2.2.b
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
2" in 8" arc
-
Bottoms- Radial length of critical zone measured from shell 653: 3.10
3"
-
Bottoms- Suggested sand pad thickness
-
Welds- Minimum distance between clusters of surface porosity 650: 8.5.2.c
4"
-
Shell Patch- Minimum dimension of a shell lap-patch 653: 9.3.1.7
4"
-
Shell Patch- Minimum radius of a shell flush-patch 653: Fig. 9.1 "R" dimension
6"
-
Shell Calcs- When calculating tmin for shell LTA, minimum distance away from the rivet where "E" is always 1.0 653: 4.3.4.1
6"
-
Bottom Patch- Minimum size of bottom lap-patch that does NOT cross a bottom seam
-
Bottom Patch- Minimum distance between a bottom lap-patch and the shell for patches that do NOT extend to the shell
- 653: Fig. 9.13 or 9.10.1.2.b
- 6"
-
Reconstruction- If reusing shell plates, minimum distance to cut from existing shell welds (if plates are not deseamed)
-
RT- Minimum diagnostic length of a RT for vertical or horizontal welds
- 650: 8.1.2.8
- 653: 12.2.1.7
- 6"
-
Weld Qualify- Minimum weld length when qualifying a welder with RT/UT using a coupon or 1st production weld
- IX: QW-302.2
- IX: QW-304.1
- 6"
-
Weld Qualify-Minimum weld length when qualifying a welding operator with RT/UT of a test coupon IX: QW-302.2
6"
-
Shell Patch- Minimum distance to overlap a shell weld when using a lap-patch
-
Corrosion- Area to dig when checking for soil-to-air corrosion 575: 8.2.10
6-12"
-
NDE- Distance of eye-to-part to count as visual exam 577: 9.3.1.e
6"-24"
-
Vacuum Box- Typical size of a vacuum box
-
Shell Patch- Minimum dimension of a shell flush-patch 653: 9.2.2.1
12"
-
Bottoms- Minimum dimension that a 3-lap joint can be from: other 3-laps, the shell, or annular plate joints 650: 5.1.5.4.2
12"
-
Bottom Patch- Minimum dimension of bottom lap-patch that crosses a bottom seam
-
Foundations- Suggested height above grade for new tank bottoms 650: B.3.1
12"
-
Shell Patch- When adding a shell flush-patch that extends to a horizontal shell weld, minimum distance to cut the horizontal weld past the new vertical welds
-
Shell Patch- Dimension of a shell flush-patch that is considered either a major repair or alteration 653: 3.20.c
> 12"
-
Definition- Dimension of a shell vertical weld if repaired or replaced is considered a major repair of major alteration 653: 3.20.e
> 12"
-
Bottom Patch- Maximum width of bottom patch in the critical zone
-
Bottoms- Minimum radial width of annular plate (distance between shell and nearest bottom fillet weld) 650: 5.1.5.4.3 & 5.5.2
24"
-
NDE- Maximum distance of eye-to-part to count as visual exam 575: 9.2.1
24"
-
Hot Tap- Minimum height of liquid above new nozzle during the hot tap operation
-
Weld Qualify- minimum weld length when qualifying a welding operator with RT/UT of first production weld IX: QW-305.1
36"
-
NDE- Length of sweep board used when checking for banding or peaking
-
Welds- Maximum distance between welder ID stamps on a tank weld
-
Shell Patch- Maximum size of shell lap-patch (vertical & horizontal dimensions)
-
Settlement- Maximum distance between tank settlement survey points across the inside of the tank 653: Fig. B.2
10'
-
Roofs- Maximum shunt spacing on floating roof
-
CP- Typical tank size for Galvanic CP systems
-
Settlement- Maximum distance between tank settlement survey points around the outside diameter of the tank 653: Fig. B.1/12.5.2
32'
-
NDE- Maximum distance between RT's in horizontal welds when welding to existing shell plates 653: 12.2.1.2.b & c
50'
-
Shell Calcs- Tank diameter when Variable Point Design method should always be used to calc shell minimum thickness 653: 4.3.3.4
> 200'
-
Shell- Minimum offset between vertical welds in adjacent courses 650: 5.1.5.2.b
5t
-
Bottoms- Minimum size of bottom welds
- 650: 5.1.5.4.3
- Full Fillet
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