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API 653 > Dimensions > Flashcards

Dimensions Flashcards

1
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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2
Q

Welds – maximum undercut of a vertical weld and nozzle weld

A

1/64”

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3
Q

Welds – maximum undercut of a horizontal weld

A

1/32”

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4
Q

Welds – maximum diameter of a surface porosity cluster

A

3/32”

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5
Q

Weld qualification – max allowed discontinuity in a bend test

A

1/8”

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6
Q

Nameplates – minimum size of nameplate letters

A

5/32”

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7
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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8
Q

Reconstruction – max amount of peaking allowed in vert welds

A

1/2”

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9
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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10
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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11
Q

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

A

1”

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12
Q

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

A

1”

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13
Q

Reconstruction - Maximum amount of banding allowed in a horizontal welds

A

1”

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14
Q

Bottoms - Minimum overlap required for single-welded lap joints

A

1”

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15
Q

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

A

2”

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16
Q

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

A

2”

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17
Q

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

A

2”

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18
Q

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

A

2”

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19
Q

Shell Patch - Minimum radius of a shell lap-patch

A

2”

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20
Q

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

A

2”

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21
Q

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

A

2”

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22
Q

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

A

2” in 8” line

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23
Q

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

A

2” in 8” arc

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24
Q

Bottoms - Radial length of critical zone measured from shell

A

3”

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25
Q

Bottoms – Suggested pad thickness

A

3-4”

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26
Q

Welds - Min distance between clusters of surface porosity

A

4”

27
Q

Shell Patch - Minimum dimension of a shell lap-patch

A

4”

28
Q

Shell Patch - Minimum radius of a shell flush-patch

A

6”

29
Q

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

A

6”

30
Q

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

A

6”

31
Q

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

A

6”

32
Q

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

A

6”

33
Q

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

A

6”

34
Q

Weld Qualification - Minimum length of RT when qualifying a welder with RT using a coupon or 1st production weld

A

6”

35
Q

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

A

6”

36
Q

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

A

6”

37
Q

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

A

6-12”

38
Q

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

A

6-24”

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”

45
Q

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

A

> 12”

46
Q

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

A

> 12”

47
Q

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

A

24”

48
Q

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

A

24”

49
Q

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

A

24”

50
Q

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

A

36”

51
Q

Weld Qualification - Minimum length of RT when qualifying a welding operator with RT of first production weld

A

36”

52
Q

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

A

36”

53
Q

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

A

36”

54
Q

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

A

48” x 72”

55
Q

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

A

10’

56
Q

Roofs – Maximum shunt spacing on floating roof

A

10’

57
Q

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

A

32’

58
Q

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

A

50’

59
Q

CP – Typical tank size for Galvanic CP systems

A
60
Q

Shell Calcs - Tank diameter when variable point design method should always be used to calc shell minimum thickness

A

> 200’

61
Q

Shell – Minimum offset between vertical welds in adjacent courses

A

5t

62
Q

Bottoms – Minimum size of bottom welds

A

Full Fillet

63
Q

Definitions – length of Shell–to–bottom weld that if repaired is considered a major repair or alteration

A

> 0”

API 653 (14 decks)

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