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api 653 chapter 8 > API 653 Chap 12 - Examination / Testing > Flashcards

API 653 Chap 12 - Examination / Testing Flashcards

1
Q

What is Annex G

A

guidance on MFL

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2
Q

What kind of NDE to perform on cavities resulting from gouging or grinding operation to when remove attachment welds of existing reinforcing paltes?

A

MT or LP

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3
Q

Type of NDE for completed welds?

A

MT or LP

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4
Q

What additional exam for unknown toughness having a t > 1/2”?

A

Fluorescent MT and/or UT

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5
Q

NDE for completed welds of stress relieved?

A

MT or LP after stress relieve BEFore hydro

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6
Q

NDE for complete repair butt / fillet welds?

A

Butt Weld - full length by RT or UT

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7
Q

NDE - Removal of attachments?(exclude shell to bottom welds)

A

Visual

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8
Q

NDE - new permanent attachments? (exclude shell to bottom welds)

A

MT or LP

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9
Q

NDE - new welds attaching existing shell plate to new or existing? and if t>1”?

A

RT, root/final pass full length by MT or LP

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10
Q

NDE for NEW shell to bottom joint welds? (3)

A
  1. Full length by using a right angle vacuum box and a solution film
  2. applying light diesel oil
  3. tested by pressurizing the volume with 15 PSIG (air) and applying a solution film to inside and outside welds.
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11
Q

NDE for existing weld shell to bottom joint ?

A

visual + MT or LP, for full length under a Weld on patch plate. An additional 6” of each side of the weld shall be examined.

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12
Q

NDE - critical zone welding , bottom repair welding

A

root/final pass full length by MT or LP

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13
Q

NDE for shell plate repairs, by weld deposit, lap welded patches?

A

visual + MT or LP

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14
Q

NDE for floating roof ? (2)

A
  1. VT from top and bottom

2. air leak, vacuum box, penetrating oil, tracer gas, (annex f)

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15
Q

How many RT is need for vertical joints?

  1. for new replacement shell to new shell plates
  2. new replacement to existing
  3. repair joints in existing?
A
  1. 0
  2. 1 additional
  3. 1 additional
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16
Q

How many RT is need for horizontal joints?

  1. for new replacement shell to new shell plates
  2. new replacement to existing
  3. repair joints in existing?
A
  1. 0
  2. 1 for each 50 ft additonal
  3. 1 for each 50 ft addtional
17
Q

How many RT is need for vertical/horizontal joints?

  1. for new replacement shell to new shell plates
  2. new replacement to existing
  3. repair joints in existing?
A
  1. 0
  2. each intersection
  3. all repair section
18
Q

What does RT additional mean?

A

In addition required by API 650 for new construction

19
Q

What does API650 new construction states for RT for vertical? for «3/8”

A
  1. butt weld joints &laquo_space;3/8”, one spot first 10 feet of completed vertical joint, thereafter 100ft , 25% at intersection + spot RT
20
Q

What does API650 new construction states for RT for horizontal?

A

butt weld joints &laquo_space;3/8”, one spot first 10 feet of completed vertical joint, thereafter 200ft.

21
Q

What does API650 new construction states for RT for vertical? for&raquo_space;3/8” but &laquo_space;1”

A

following «3/8” + spot RT at the bottom course + spot RT at intersections + «3/8” requirements

22
Q

What does API650 new construction states for RT for vertical? for&raquo_space; 1”

A

full length RT + everything in&raquo_space;3/8 but «1”

23
Q

RT record of all repair welds shall be marked with?

A

“R”

24
Q

RT requirement for circular replacement plates?

A

1 RT regardless of thickness, t >1” weld full length RT

25
Q

shell plate and door sheet welds RT requirement?

A

all junction need to be RT, 100% if defects are found

26
Q

square and rectangle RT requirement?

A

at least 1 RT in vertical joint, horizontal, corner

27
Q

min diagnostic length of RT?

A

6”

28
Q

full hydro test held for how many hours?

A

24 hours

29
Q

When should hydro be performed?

A
  1. any reconstructed tank
  2. major repairs/alteration
  3. severity of service increase
30
Q

When do you not need a hydro ? (5)

A

If engineer + owner signs off , AND

  1. new material meet section 4 API650 requirement
  2. no impact test needed
  3. not exceed 7000 PSI
  4. full penetration butt weld
  5. RT root/final pass weld
31
Q

shell to bottom weld repair requirements (2)

A
  1. weld can be removed and replace as long as it meet 650 5.1.5.7
  2. weld on one side of shell can be completely removed not exceeding 12”.
32
Q

tank settlement survery?(5)

A
  1. should be uniformly distributed, around circumference
  2. N=D/10,
  3. rounded to the EVEN number
  4. min is 8 points,
  5. max spacing is 32feet

api 653 chapter 8 (36 decks)

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