Dimensions Flashcards by Carlos Alegria

Linings - Typically anchor profile of steel surface required for the installation of a tank bottom lining

1.5 – 4.0 mils
Reference: 652: 7.5

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Welds - Maximum undercut of a vertical weld & nozzle weld

1/64”
Reference: 650: 8.5.2.b

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Welds - Maximum undercut of a horizontal weld

1/32”
Reference: 650: 8.5.2.b

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Welds - Maximum diameter of a surface porosity cluster

3/32”
Reference: 650: 8.5.2.c

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Weld Qualification - Max allowed discontinuity in a Bend Test

1/8”
Reference: IX: QW-163

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Nameplates - Minimum size of nameplate letters

5/32”
References: 650: 10.1.1 & 653: 13.1.1.1

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Bottoms - Minimum external projection of bottom plate on an existing tank (from toe of shell-to-bottom FW)

3/8”
Reference: 653: 4.4.5.7

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Repairs - Max amount of peaking or banding allowed

1/2”
Reference: 650: 7.5.4.a & b

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Reconstruction - Max amount of peaking allowed in vert welds

1/2”
Reference: 653: 10.5.4

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Shell Calcs – When calculating tmin for shell LTA, minimum distance away from a weld where “E” is always 1.0

> 1” or 2t
Reference: 653: 4.3.3.1 (definitions)

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Shell Patch - Minimum overlap of shell lap-patch used to cover a hole (edge of hole to edge of patch)

1”
Reference: 653: 9.3.2.3

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NDE - When performing a PT examination, minimum distance to clean beyond the area to be examined

1”
Reference: V: T-642.b

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NDE - When performing a MT examination, minimum distance to clean beyond the area to be examined

1”
Reference: V: T-741.1.b

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Reconstruction - Maximum amount of banding allowed in a horizontal welds

1”
Reference: 653: 10.5.5

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Bottoms - Min overlap required for single-welded lap joints

1”
Reference: 650: 5.1.3.5

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Bottoms - Minimum external projection of bottom plate on a new tank

2”
Reference: 650: 5.4.2

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Vacuum Box - Minimum overlap of previously test surfaces when using a vacuum box

2”
Reference: 650: 8.6.5

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Bottom Patch - Minimum overlap of bottom lap-patch used to cover corroded area (edge of corrosion to edge of patch)

2”
Reference: 653: Fig. 9.13

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Bottom Patch - Minimum distance bottom lap-patch fillet weld to the nearest existing bottom weld

2”
Reference: 653: Fig. 9.13

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Shell Patch - Minimum radius of a shell lap-patch

2”
Reference: 653: 9.3.1.4

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Reconstruction - If reusing bottom plates, min distance to cut from existing bottom welds (if plates are not deseamed)

2”
Reference: 653: 10.3.2.1

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Reconstruction - If reusing roof plates, min distance to cut from existing roof welds (if plates are not deseamed)

2”
Reference: 653: 10.3.4.1

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Shell Pitting - Maximum allowed vertical length of pits on a tank shell (amount below corrosion allowance)

2” in 8” line
Reference: 653: 4.3.2.2.b

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Bottom Pitting - Maximum allowed length of pits in the critical zone that can be repaired by weld-buildup

2” in 8” arc

653: 9.11.1.6.a

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Bottoms - Radial length of critical zone measured from shell

3” 653: 3.11

Bottoms – Suggested sand pad thickness

3-4” 650: B.3.2

Welds - Min distance between clusters of surface porosity

4” 650: 8.5.2.c

Shell Patch - Minimum dimension of a shell lap-patch

4” 653: 9.3.1.7

Shell Patch - Minimum radius of a shell flush-patch

6” 653: Fig 9.1 “R” dimension

Shell Calcs – When calculating tmin for shell LTA, minimum distance away from a rivet where “E” is always 1.0

6” 653: 4.3.4.1

Bottom Patch - Minimum size of bottom lap-patch that does NOT cross a bottom seam

6” 653: 9.11.1.1.c

Bottom Patch - Minimum distance between a bottom lap-patch and the shell for patches that do NOT extend to the shell

6” 653: Fig 9.13 or 9.11.1.2.b

Reconstruction - If reusing shell plates, min distance to cut from existing shell welds (if plates are not deseamed)

6” 653: 10.3.3.1.c

RT - Minimum diagnostic length of a RT for vertical or horizontal welds

6” 650: 8.1.2.8 653: 12.2.1.7

Weld Qualify - Minimum weld length when qualifying a welder with RT/UT using a coupon or 1st production weld

6” IX: QW-302.2 IX: QW-304.1

Weld Qualify - Minimum weld length when qualifying a welding operator with RT/UT of a test coupon

6” IX: QW-302.2

Shell Patch – Minimum distance to overlap a shell weld when using a lap-patch

6” 653: 9.3.1.5

Corrosion – Area to dig when checking for soil-to-air corrosion

6 – 12” 575: 8.2.11.1.1

NDE – Distance of eye-to-part to count as a Visual Exam

6 - 24” 577: 8.3.1.f

Vacuum Box - Typical size of a vacuum box

6” x 30” 650: 8.6.1

Shell Patch - Minimum dimension of a shell flush-patch

12” 653: 9.2.2.1

Bottoms - Minimum dimension that a 3-lap joint can be from: other 3-laps, the shell, or annular plate joints

12” 650: 5.1.5.4.2

Bottom Patch - Minimum dimension of bottom lap-patch that crosses a bottom seam

12” 653: 9.11.1.1.a

Foundations - Suggested height above grade for new tank bottoms

12” 650: B.3.1

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

12” 653: Fig 9.1 Note 2

Shell Patch - Dimension of a shell flush-patch that is considered either a major repair or alteration

> 12” 653: 3.26.c

Definition - Dimension of a shell vertical weld if repaired or replaced is considered a major repair or major alteration

> 12” 653: 3.26.e

Bottom Patch – Max width of bottom patch in the critical zone

24” 653: 9.11.1.2.i

Bottoms - Minimum radial width of annular plate (distance between shell and nearest bottom fillet weld)

24” 650: 5.5.2

Hot Tap - Minimum height of liquid above new nozzle during the hot tap operation

36” 653: 9.15.1.2

Weld Qualify - Minimum weld length when qualifying a welding operator with RT/UT of first production weld

36” IX: QW-305.1

NDE - Length of sweep board used when checking for banding or peaking

36” 653: 10.5.4 / 5

Welds - Maximum distance between welder ID stamps on a tank weld

36” 650: 9.4 653: 11.2.2

Shell Patch - Maximum size of shell lap-patch (vertical & horizontal dimensions)

48” x 72” 653: 9.3.1.7

Settlement - Maximum distance between tank settlement survey points across the inside of the tank

10’ 653: Fig B.2

Roofs – Maximum shunt spacing on floating roofs

10’ 650: C.3.1.6

CP – Typical tank size for Galvanic CP systems

< 20’ 651: 6.2.1

Settlement - Maximum distance between tank settlement survey points around the outside diameter of the tank

32’ 653: Fig B.1 / 12.5.2

NDE - Maximum distance between RT’s in horizontal welds when welding to existing shell plates

50’ 653: 12.2.1.2 b&c

Shell Calcs - Tank diameter when Variable Point Design method should always be used to calc shell minimum thickness

> 200’ 653: 4.3.3.4

Shell – Minimum offset between vertical welds in adjacent courses

5t 650: 5.1.5.2.b

Bottoms – Minimum size of bottom welds

Full Fillet 650: 5.1.5.4.3