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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
Reference: 652: 7.5

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2
Q

Welds - Maximum undercut of a vertical weld & nozzle weld

A

1/64”
Reference: 650: 8.5.2.b

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3
Q

Welds - Maximum undercut of a horizontal weld

A

1/32”
Reference: 650: 8.5.2.b

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4
Q

Welds - Maximum diameter of a surface porosity cluster

A

3/32”
Reference: 650: 8.5.2.c

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5
Q

Weld Qualification - Max allowed discontinuity in a Bend Test

A

1/8”
Reference: IX: QW-163

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6
Q

Nameplates - Minimum size of nameplate letters

A

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

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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”
Reference: 653: 4.4.5.7

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8
Q

Repairs - Max amount of peaking or banding allowed

A

1/2”
Reference: 650: 7.5.4.a & b

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9
Q

Reconstruction - Max amount of peaking allowed in vert welds

A

1/2”
Reference: 653: 10.5.4

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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
Reference: 653: 4.3.3.1 (definitions)

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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”
Reference: 653: 9.3.2.3

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12
Q

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

A

1”
Reference: V: T-642.b

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13
Q

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

A

1”
Reference: V: T-741.1.b

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14
Q

Reconstruction - Maximum amount of banding allowed in a horizontal welds

A

1”
Reference: 653: 10.5.5

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15
Q

Bottoms - Min overlap required for single-welded lap joints

A

1”
Reference: 650: 5.1.3.5

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16
Q

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

A

2”
Reference: 650: 5.4.2

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17
Q

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

A

2”
Reference: 650: 8.6.5

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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”
Reference: 653: Fig. 9.13

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19
Q

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

A

2”
Reference: 653: Fig. 9.13

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20
Q

Shell Patch - Minimum radius of a shell lap-patch

A

2”
Reference: 653: 9.3.1.4

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21
Q

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

A

2”
Reference: 653: 10.3.2.1

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22
Q

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

A

2”
Reference: 653: 10.3.4.1

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23
Q

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

A

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

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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

653: 9.11.1.6.a

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25
Q

Bottoms - Radial length of critical zone measured from shell

A

3”

653: 3.11

26
Q

Bottoms – Suggested sand pad thickness

A

3-4”

650: B.3.2

27
Q

Welds - Min distance between clusters of surface porosity

A

4”

650: 8.5.2.c

28
Q

Shell Patch - Minimum dimension of a shell lap-patch

A

4”

653: 9.3.1.7

29
Q

Shell Patch - Minimum radius of a shell flush-patch

A

6”
653: Fig 9.1 “R” dimension

30
Q

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

A

6”

653: 4.3.4.1

31
Q

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

A

6”

653: 9.11.1.1.c

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”

653: Fig 9.13
or 9.11.1.2.b

33
Q

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

A

6”

653: 10.3.3.1.c

34
Q

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

A

6”

650: 8.1.2.8
653: 12.2.1.7

35
Q

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

A

6”

IX: QW-302.2
IX: QW-304.1

36
Q

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

A

6”

IX: QW-302.2

37
Q

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

A

6”

653: 9.3.1.5

38
Q

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

A

6 – 12”

575: 8.2.11.1.1

39
Q

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

A

6 - 24”

577: 8.3.1.f

40
Q

Vacuum Box - Typical size of a vacuum box

A

6” x 30”

650: 8.6.1

41
Q

Shell Patch - Minimum dimension of a shell flush-patch

A

12”

653: 9.2.2.1

42
Q

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

A

12”

650: 5.1.5.4.2

43
Q

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

A

12”

653: 9.11.1.1.a

44
Q

Foundations - Suggested height above grade for new tank bottoms

A

12”

650: B.3.1

45
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”

653: Fig 9.1
Note 2

46
Q

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

A

> 12”

653: 3.26.c

47
Q

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

A

> 12”

653: 3.26.e

48
Q

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

A

24”

653: 9.11.1.2.i

49
Q

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

A

24”

650: 5.5.2

50
Q

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

A

36”

653: 9.15.1.2

51
Q

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

A

36”

IX: QW-305.1

52
Q

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

A

36”

653: 10.5.4 / 5

53
Q

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

A

36”

650: 9.4
653: 11.2.2

54
Q

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

A

48” x 72”

653: 9.3.1.7

55
Q

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

A

10’

653: Fig B.2

56
Q

Roofs – Maximum shunt spacing on floating roofs

A

10’

650: C.3.1.6

57
Q

CP – Typical tank size for Galvanic CP systems

A

< 20’

651: 6.2.1

58
Q

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

A

32’

653: Fig B.1 / 12.5.2

59
Q

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

A

50’

653: 12.2.1.2 b&c

60
Q

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

A

> 200’

653: 4.3.3.4

61
Q

Shell – Minimum offset between vertical welds in adjacent courses

A

5t

650: 5.1.5.2.b

62
Q

Bottoms – Minimum size of bottom welds

A

Full Fillet

650: 5.1.5.4.3

653 (12 decks)

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