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653 > Dimensions > Flashcards

Dimensions Flashcards

1
Q

Linings - Typical anchor profile of steel required for install of a tank bottom lining.

A

1.5-4.0 mils

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2
Q

Welds - Max undercut of a vert weld & nozzle weld

A

1/64”

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3
Q

Welds - Max undercut of a horizontal weld

A

1/32”

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4
Q

Max diameter of a surface porosity cluster

A

3/32”

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5
Q

Weld Qual - Max allowed discontinuity in a bend test

A

1/8”

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6
Q

Nameplates - Min. size of nameplate letters

A

5/32”

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7
Q

Bottoms - Min 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, min 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 MT or PT exam, min distance to clean beyond inspection area.

A

1”

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12
Q

Reconstruction - Max amount of banding allowed in horizontal welds

A

1”

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13
Q

Bottoms - Min overlap required for single-welded lap joints

A

1”

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14
Q

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

A

2”

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15
Q

Vac Box - Min overlap of previously tested areas

A

2”

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16
Q

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

A

2”

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17
Q

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

A

2”

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18
Q

Shell Patch - Min radius of a shell lap-patch

A

2”

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19
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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20
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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21
Q

Shell Pitting - Max allowed vert length of pits on shell

A

2” in 8” line

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22
Q

Bottom Pitting - Max allowed length of pits in crit zone that can be repaired by weld buildup

A

2” in 8” arc

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23
Q

Bottoms - Radial length of crit zone measured from shell

A

3”

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24
Q

Bottoms - Suggested sand pad thickness

A

3-4”

25
Q

Welds - Min distance between clusters of surface porosity

A

4”

26
Q

Shell Patch - Min dimension of a shell lap-patch

A

4”

27
Q

Shell Patch - Min radius of a shell flush-patch

A

6”

28
Q

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

A

6”

29
Q

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

A

6”

30
Q

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

A

6”

31
Q

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

A

6”

32
Q

RT - Min length of a RT for a vert or hori. weld

A

6”

33
Q

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

A

6”

34
Q

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

A

6”

35
Q

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

A

6”

36
Q

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

A

6-12”

37
Q

NDE - Distance of eye to part to count as a visual exam

A

6-24”

38
Q

Vac Box - Typical size of a vac box

A

6x30”

39
Q

Shell Patch - Min dimension of a shell flush-patch

A

12”

40
Q

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

A

12”

41
Q

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

A

12”

42
Q

Foundations - Suggested height above grade for new tank bottoms

A

12”

43
Q

Shell Patch - When adding a shell flush-patch that extends to a horizontal shell weld, min distance to cut the horizontal weld past the new vertical welds

A

12”

44
Q

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

A

> 12”

45
Q

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

A

> 12”

46
Q

Bottom Patch - Max width of bottom patch in the crit zone

A

24”

47
Q

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

A

24”

48
Q

NDE - Max distance of eye to part to count as visual exam

A

24”

49
Q

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

A

36”

50
Q

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

A

36”

51
Q

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

A

36”

52
Q

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

A

36”

53
Q

Shell Patch - Max size of a shell lap-patch (vert & hori)

A

48” x 72”

54
Q

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

A

10’

55
Q

Roofs - Max shunt spacing on floating roof

A

10’

56
Q

CP - Typical tank size for Galvanic CP systems

A

<20’

57
Q

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

A

> 200’

58
Q

Shell - Min offset between vert welds in adjacent courses

A

5t

59
Q

Bottoms - Min size of bottom welds

A

Full Fillet

653 (10 decks)

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