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api 653 chapter 8 > lockhart day 3 training > Flashcards

lockhart day 3 training Flashcards

1
Q

single lap welded joint are allowed?

A
  1. bottom plates

2. roof plates

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2
Q

min size of fillets? T > 3/16 and t < 3/16

A
  1. t >3/16 = shall be less than 1/3 of thickness of thinner plate and ATLEAST 3/16”
  2. t &laquo_space;3/16 = full fillet
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3
Q

when is a lap patch not allowed? what thickness?

A

when t > 1/2”

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4
Q

what is min lap patch thickness?

A

3/16” but not greater than 1/2”

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5
Q

Max size for lap patch?

A

48” x 72”

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6
Q

min size for lap patch

A

4”

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7
Q

joint efficiency for a lap patch ? (2)

A

0.7 / 0.35

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8
Q

lap patch overlap min/ max?

A 
min = 1"
max = 8t
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9
Q

hot tapping requirements? (3)

A
  1. 3feet below liquid level
  2. <7000 psi
  3. reinforcement thickness = shell thickness
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10
Q

hot tapping with unknown metal limitation?

A
  1. limited to 4”
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11
Q

what is hot tapping procedure?

A

API 2201

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12
Q

when do you need a reinforcement pad ?

A

when NPS > 2”

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13
Q

when is hot tap not allowed?

A

not allowed when PWHT is required

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14
Q

how to calculate hydro pressure?

A

1.5 X 0.433 X liquid height

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15
Q

min radius for a lap patch ?

A

2”

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16
Q

overlap distance requirement for lap patch CROSSES an existing butt weld?

A

6”

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17
Q

how close can the horizontal weld of a repair plate be to the shell to bottom weld?

A

6”

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18
Q

min required overlap of a bottom lap patch to cover a corroded area?

A

2”

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19
Q

min dimension for a welded on patch for the tank bottom that overlaps a 3 lap seam?

A

12”

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20
Q

max dimension of a bottom lap patch that is within the critical zone

A

24”

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21
Q

min required distance a bottom lap patch must be from an existing bottom plate weld

A

2”

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22
Q

max taper for a shell patch

A

1:4

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23
Q

require shape of a floor patch that is within 6” of a shell

A

tombstone

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24
Q

max thickness of a lap patch in critical zone

A

1/4”

25
Q

min allow roof rim thickness before replacing? new roof thickness?

A

0.1” / 3/16” + CA

26
Q

when should settlement survey be conducted?

A

prior to hydro, EXCEPT for tanks with acceptable settlement history.

27
Q

max measurement points OD / ID for bottom settlement

A

32 feet / 10 feet

28
Q

NDE method for hot tap nozzles?

A

MT or PT (for all attachment welds)

29
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”

30
Q

when dismantling a tank, how much of the existing weld should be cut out?

A

lessor of( 1/2” of weld metal width OR 1/4 each side)

31
Q

shell rings maybe be dismantle by cutting a min of what distance form existing welds?

A

6”

32
Q

when dismantling a tank how should roof plates be cut out?

A

deseaming 2” away

33
Q

how many set of punch work required to facilitate proper alignment during reconstruction

A

2 set

34
Q

At what temp is welding not allowed

A

Less than 0 F

35
Q

when are settlement measurement support to be measure? (2)

A
  1. during filling

2. when water is 100%

36
Q

Welding consumables conform to which specs?

A

AWS

37
Q

new material for tank reconstruction shall comply with?

A

current applicable standards

38
Q

when is it necessary to remove tack welds?

A

when manual welding process is used

39
Q

When is it not necessary to remove the tank welds?

A

SAW process (submerged arc process)

40
Q

when to use low h2 electrodes for what materials (2)

A
  1. Group Iv , Iva , v, Vi

2. group I / II/ III if t > 1/2”

41
Q

max out of plumbess?

A

1/100 of tank total height MAX - 5”

42
Q

lowest design metal temperature

A

15 F ABOVE lowest one day mean temp

43
Q

concrete ring wall NOT used out of levelness allowed?

A

1/8’ in any 10 feet circumference and 1/2” of average elevation

44
Q

concrete ring wall IS used out of levelness allowed?

A

1/8’ in any 30 feet circumference and 1/4” of average elevation

45
Q

WPS / PQR is accordance to?

A

ASME IX, API 653, API650

46
Q

when can preheat or CDW in lieu of PWHT be used for a tank repair?

A

repairs on nozzles

47
Q

impact test NOT required, preheat requirement applicable to which material?

A

P1

48
Q

impact test IS required, applicable to which material and use what method?

A

CDW , P1/P2/P3

49
Q

what welding process can be substitute preheat for the code required PWHT?

A

SMAW, GMAW, FCAW, GTAW

50
Q

what min require preheat temp and max interpass temp? if impact testing is not required and CDW?

A

300F / 600 F

51
Q

impact testing is not required (CDW) how far past the weld must preheat be checked?

A

4” or 4t (greater)

52
Q

NDE method for new/existing penetration

A

PT or MT

53
Q

projection of the bottom plate beyond the outside toe of the shell to bottom weld shall be at least….

A

3/8”

54
Q

when can lap patch not be used?

A

When presence of the produce in the crevice between the lap patch AND shell prevent gas from freeing

55
Q

lap patch repairs should be? (type of welds)

A

Full fillet welds - (match the thickness of thinner plate)

56
Q

NDe required for (2)existing bottom to shell weld

A
  1. MT or PT for fulling length under a welded on patch plate

2. additional 6” on each side examined

57
Q

NDe requirement for bottom plate repair?

A

VI –> MT/PT –>vaccum box and tracer

58
Q

what can lap patches NOT be installed over?

A

rivets, unrepaired cracks, other lap patches , lap welded seams

59
Q

what is critical zone min thickness requirement?

A

small of (1/2 t bottom or 50% of tmin of lower shell course), NOT less than 0.1”

api 653 chapter 8 (36 decks)

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