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API 653 > Section 12 > Flashcards

Section 12 Flashcards

Examination and Testing

1
Q

What NDE method must be used to examine cavities caused by grinding/gouging off a reinforcement plate for an existing penetration?

A

PT or MT

API 653 par 12.1.2.2

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2
Q

What NDE method(s) should be used to examine welds for a new reinforced penetration?

A

PT or MT

API 653 par 12.1.2.3

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3
Q

What NDE method(s) should be used when installing a new reinforced penetration, if it installed into an unknown shell material?

A

PT or MT and consideration should be given to be used WFMT or UT

API 653 par 12.1.2.3

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4
Q

What NDE method(s) must be used to examine a stress-relieved assembly?

A

PT or MT

API 653 par 12.1.2.4

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5
Q

What type of NDE is required after removing a temporary or permanent attachment from a shell?

A

VT - NOTE: Only when the material is low strength steel (i.e. Type IIIA or less per API 650)

API 653 par 12.1.4.1

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6
Q

A permanent attachment is being installed to a tank constructed with A516-70 shell material. What type of NDE is required for the new attachment welds?

A

VT and MT
NOTE: PT can be used if approved by owner.

API 653 par 12.1.4.2

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7
Q

What is the pressure that is required when air testing the shell-to-bottom weld?

A

15 psig

API 653 par 12.1.6.2

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8
Q

What thickness of shell plate requires 100% radiography and MT or PT, when welding existing plates?

A

> 1”

API 653 par 12.1.5.1

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9
Q

What is the pressure that is required when air testing the shell-to-bottom weld?

A

15 psig

API 653 par 12.1.6.2

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10
Q

What is the minimum number of radiographs required on a square of rectangular shell replacement plate?

A

6

API 653 par 12.2.1.6.2

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11
Q

A lap patch is being installed to the tank bottom plate such that the outer edge of the patch will be welded to the existing shell-to-bottom weld. What NDE is required for the existing bottom-to-shell- weld?

A

MT or PT of entire section of weld that will be covered by the patch and 6” on either side of patch (before patch is installed)

API par 12.1.6.3

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12
Q

A lap patch is being installed over a corroded section of plate. What NDE is required?

A

VT and MT or PT

API 653 par 12.1.8.2

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13
Q

A corroed section of plate is being repaired by welding building up the corroded area. What NDE is required?

A

VT and MT or PT

API 653 par 12.1.8.1

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14
Q

What NDE is required when a repair is made to a ‘steel’ floating roof?

A

VT and any of the following (leak test, vacuum box, penetrating oil, tracer gas, NDE).
NOTE: NDE method is left up to the owner/inspector

API 653 par 12.1.10.1

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15
Q

A 8’ long section of 3/8” thick shell plate is being installed to replace a corroded section of shell plate. The height of the vertical joint is 4’, How many radiographs are required for the vertical joints if all welds are made by one welder?

A

3
NOTE: (1 per 10’ of weld per API 650 par 8.1.2.2a & Figure 8.1, then API 653 par 12.2.1.1 requires 1 additional for each joint). Ignore the junctions because the question was restricted to ‘vertical’ weld only

API 653 par 12.2.1.1b and API 650 par 8.1.2

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16
Q

A 8’ long section of 3/8” thick shell plate is being installed to replace a corroded section of shell plate. How many radiographs are required for the horizontal joints if all welds are made by more than welder?

A

2
NOTE: One per first 10’ of weld, then 1 per each additional 200’ of weld per API 650 par 8.1.2.3 and does not require radiographs to be taken for each welder for a ‘horizontal’ joint.) API 653 only requires an additional radiograph for each 50’ of weld.

17
Q

What is the maximum distance between radiographs for horizontal welds when welding a new plate to and existing plates?

A

50’

API 653 par 12.2.1.2

18
Q

A 8’ long section of shell plate is being installed to replace a corroded section of shell plate. How many radiographs are required for the junctions between vertical and horizontal joints?

A

4
NOTE: API 653 par 12.2.1.3b requires each junction to be examined

API 653 par 12.2.1.3

19
Q

What % of RT is required for butt-welded annular plate joints on a reconstructed tank?

A

10%

API 653 PAR 12.2.1.4 AND api 650 8.1.2.9

20
Q

What & of RT is required where a new butt-welded in annular plate joints intersects and existing annular plate weld on a reconstructed tank?

A

25%

API 653 par 12.2.1.5

21
Q

A 8’ long section of 1” thick shell plate is being installed to replace a corroded section of shell plate and both vertical joints intersect existing horizontal welds. How many radiographs are required?

A

6 (1 in each of the 4 corners, 1 in horzontal weld and 1 in a vertical weld)

API 653 par 12.2.1.6 thru 12.2.1.6.2

22
Q

How many radiographs are required for a round shell patch?

A

1

API 653 par 12.2.1.6.1

23
Q

What is the minimum diagnostic length for a radiograph per API 653?

A

6”

API 653 par 12.2.1.7

24
Q

An insert patch is being installed for a penetration. What is the % of radiography that is required?

A

100%

API 653 par 12.2.1.8

25
Q

What lead letter is used during radiographing to indicate a repair?

A

R

API 653 par 12.2.3.2

26
Q

When a hydrostatic test is required, what is the minimum duration for the test?

A

24 hours

API 653 par 12.3.1

27
Q

When is a settlement survery required prior to performing a hydrostatic test?

A

When there is no service history of acceptable settlement

API 653 par 12.5.1

28
Q

When a settlement survery is required, what is the minimum required number of settlement measurement points around perimeter of tank?

A

8

API 653 par 12.5.2

29
Q

When a settlement survery is required, what is the maximum spacing allowed between setleement measurement points?

A

32’

API 653 par 12.5.2

30
Q

When a settlement survery is required during a hydrotest, how often do measurement points need to be checked?

A

During fillinf and at 100% water test level

API 653 par 12.5.3

API 653 (17 decks)

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