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API Data sheets > Dimensions > Flashcards

Dimensions Flashcards

1
Q

Definitions- Length of shell-to-bottom weld that if repaired is considered either a major repair or alteration

A

> 0”

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2
Q

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

A

1.5- 4.0 mils

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3
Q

Welds- Maximum undercut of a vertical weld & nozzle weld

A

1/64”

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4
Q

Welds- Maximum undercut of horizontal weld

A

1/32”

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5
Q

Welds- Maximum diameter of a surface porosity cluster

A

1/32”

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6
Q

Weld Qualification- Max allowed discontinuity in a Bend Test

A

1/8”

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7
Q

Nameplates- Minimum size of nameplate letters

A

5/32”

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8
Q

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

A

3/8”

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9
Q

Reconstruction - Max amount of peaking allowed in vert welds

A

1/2”

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10
Q

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

A

> 1” or 2t

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11
Q

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

A

1”

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12
Q

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

A

1”

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13
Q

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

A

1”

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14
Q

Reconstruction- Maximum amount of banding allowed in a horizontal weld

A

1”

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15
Q

Bottoms- Minimum overlap required for single-lwelded lap joints

A

1”

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16
Q

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

A

2”

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17
Q

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

A

2”

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18
Q

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

A

2”

19
Q

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

A

2”

20
Q

Shell Patch- Minimum radius of a shell lap-patch

A

2”

21
Q

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

A

2”

22
Q

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

A

2”

23
Q

Shell Pitting- Maximum allowed vertical length of pits on a tank shell

A

2” in 8” line

24
Q

bottom pitting- maximum allowed length of pits in the critical zone that can be repaired by weld-buildup

A

2” in 8” arc

25
Q

Bottoms- Radial length of critical zone measured from shell

A

3”

26
Q

Bottoms- Suggested pad thickness

A

3-4”

27
Q

Welds- Min distance between clusters of surface porosity

A

4”

28
Q

Shell Patch- Minimum dimension of a shell lap-patch

A

4”

29
Q

Shell Patch- Minimum radius of a shell flush-patch

A

6”

30
Q

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

A

6”

31
Q

Bottom Patch- Minimum radius of a shell flush-patch

A

6”

32
Q

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

A

6”

33
Q

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

A

6”

34
Q

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

A

6”

35
Q

Weld Qualification- Minimum length of a RT for vertical or horizontal welds

A

6”

36
Q

Weld Qualification- Minimum length of RT when qualifying a welding operator with RT of a test coupon

A

6”

37
Q

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

A

6”

38
Q

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

A

6-12”

39
Q

Vacuum Box- Typical size of a vacuum box

A

6” x 30”

40
Q

Shell Patch- Minimum dimension of a shell flush-patch

A

12”

41
Q

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

A

12”

42
Q

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

A

12”

43
Q

Foundations- Suggested height above grade for new tank bottoms

A

12”

44
Q

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

A

12”

API Data sheets (3 decks)

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