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API 653 > Section 10 > Flashcards

Section 10 Flashcards

Dismantling and Reconstruction

1
Q

Who can authorize all tank reconstruction work?

A

Inspector or Engineer

API 653 par 10.1.3

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2
Q

When dismantling a tank, how close to an existing weld can the tank bottom plates be cut if they are going to be reused?

A

2”

API 653 par 10.3.2.1

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3
Q

When dismantling a tank by cutting out the existing weld, how much of the existing shell weld should be cut out?

A

Lesser of 1/2 of the weld width or 1/4” on each side of the welds, whichever is less

API 653 par 10.3.3.1a

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4
Q

When dismantling a tank without cutting out the weld, how far from the existing shell welds should the cuts be made?

A

A minimum of 6” from the weld

API 653 par 10.3.3.1c

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5
Q

If reusing bottom plates to recontruct a tank, what is the minimum distance to cut from existing bottom welds (if plates are not deseamed)?

A

2”

API 653 par 10.3.2.1

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6
Q

When dismantling a tank, how should roof plates be cut out?

A

By deseaming or 2” away from existing welds if not deseaming

API 653 par 10.3.4.1

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7
Q

How many sets of punch marks on top and bottom edges of shell plates are required to facilitate proper alignment during reconstruction?

A

2 sets

API 653 par 10.3.5.2

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8
Q

During reconstruction of a tank, what is the base metal temperature where welding is not allowed?

A

< 0°F

API 653 par 10.4.2.3

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9
Q

During reconstruction of tank, at what base metal temperature are your required to preheat to a temperature warm to the hand (~140°F)?

A

Between 0°F and 32°F

API 653 par 10.4.2.3

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10
Q

During reconstruction of a tank, what is the required preheat for before welding members over 1½” thick?

A

200°F minimum

API 653 par 10.4.2.3 & 10.4.4.3

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11
Q

During recontruction of tank, when is it necessary to remove the tack welds?

A

When a manual welding process is being used

API 653 par 10.4.2.7

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12
Q

During reconstruction of tank, when is it not necessary to remove the tack welds?

A

When joints are welded with submerged arc process

API 653 par 10.4.2.7

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13
Q

During reconstruction of tank, when is it required to weld the first shell course to the bottom plate or annular plate with low-hydrogen electrodes?

A

Shell course over ½” thick of API 650 Group I - III materials and all shell chourses of API 650 Group IV - VI

API 653 par 10.4.2.9

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14
Q

During reconstruction of a tank, what should be welded first; shell to bottom joints or bottom joints?

A

Shell to bottom joints

API 653 par 10.4.3.2

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15
Q

During reconstruction of a tank, when can misalignment at the vertical seam exceed 10% of the top shell plate thickness?

A

When upper plate is 5/8” or less thick (examplate; 0.250 top plate can be misaligned by 1/16” max, which is 25% of the 1/4” thickness).

API 653 par 10.4.4.1

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16
Q

What is the maximum allowed shell misalignment for a reconstructed tank with a 1/2” shell thickness?

A

1/16” (0.0625”)

API 653 par 10.4.4.1

17
Q

During reconstruction of a tank, when can misalignment at the horizontal seam exceed 20% of the top shell plate thickness

A

When upper plate is less than 5/16” thick

API 653 par 10.4.4.2

18
Q

What is the maximum out-of-plumness of the top of the shell relative to the bottom of the shell for a reconstructed tank?

A

Lesser of 1/100 or 5”

API 653 par 10.5.2.1

19
Q

When measuring the peaking/banding of a tank, what is the required length for a sweep board?

A

36”

API 653 par 10.5.4 & 10.5.5

20
Q

What does peaking check for?

A

Deviations from the theoretical shape at a vertical weld

API 653 par 10.5.4 and API 650 par 7.5.4

21
Q

What does banding check for?

A

Deviations from the theoretical shape at the horizontal weld

API 653 par 10.5.5 and API 650 par 7.5.4

22
Q

What is the maximum allowed peaking for a 60’ diameter reconstructed tank?

A

1/2”

API 653 par 10.5.4

23
Q

What is the maximum allowed banding for a 60’ diameter reconstructed tank?

A

1”

API 6530 par 10.5.5

24
Q

When a concrete ring wall is used, what is the maximum allowed out-of-levelness under the shell for 120’ diameter tank at any point around the shell?

A

1/8”, in any 30’ of circumference

API 653 par 10.5.6.2

25
Q

When a concrete ring wall is used, what is the total allowed out-of-levelness under the shell for 120’ diameter tank?

A

1/4” of the average elevation

API 653 par 10.5.6.2

26
Q

When a concrete ring wall is not used, what is the maximum allowed out-of-levelness under the shell for 120’ diameter tank at any point around the shell?

A

1/8”, in any 10’ of circumference

API 653 par 10.5.6.2

27
Q

When a concrete ring wall is not used, what is the total allowed out-of-levelness under the shell for 120’ diameter tank?

A

1/2” of the average elevation

API 653 par 10.5.6.2

API 653 (17 decks)

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