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API 653 > Section 8 & 9 > Flashcards

Section 8 & 9 Flashcards

Design Considerations for Reconstructed Tanks

1
Q

What type of weld join is required for new shell joints in a reconstructed tank?

A

All new shell joints shall be butt-welded joints with complete penetration and complete fusion

API 653 par 8.2.2

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2
Q

What is the thickness used in the design calculations based upon for a reconstructed tank?

A

Thickness measurements taken 180 days prior to construction

API 653 par 8.4.1

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3
Q

What code is used to determine the allowable stress for a reconstructed tank?

A

API 650 (Tables 5-2a & 5-2b)

API 653 par 8.4.2 & 8.4.3

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4
Q

How do you determine corrosion allowance for a reconstructed tank?

A

The required corrosion allowance is deducted from the actual thickness prior to calculating max liquid level. Any extra thickness can be used as corrosion allowance.

API 653 par 8.4.4

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5
Q

What code should new and replacement penetrations meet for a reconstructed tank?

A

The current code

API 653 par 8.5.1

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6
Q

What code shall be used as the basis for repair and alterations?

A

API 650

API 653 par 9.1.1

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7
Q

What is the minimum required dimension for a shell replacement plate?

A

Greater than 12” or 12 times the replacement plate thickness

API 653 par 9.2.2.1

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8
Q

What is the minimum radius for a shell flush patch?

A

6”

API 653 par 9.2.2.1 & Figure 1

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9
Q

When does the weld for a replacement plate not have to be full-penetration and complete fusion?

A

For lap-patch repairs

API 653 par 9.2.3.1

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10
Q

What is the minimum radius allowed for door sheet?

A

6” for t ≤ ½” thick
or
Greater of 6” or 6t for t > ½” See Fig. 9.5 and Fig. 9.1

API 653 par 9.2.4.6

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11
Q

How close can the horizontal weld of a door sheet be to an existing weld in the floor plate?

A

Greater of 3” or 5V See Fig. 9.5 and Fig. 9.1

API 653 par 9.2.4.6

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12
Q

What is the maximum thickness when a shell lap-path is allowed?

A

> ½”

API 653 par 9.3.1.2

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13
Q

What is the minimum required thickness for a shell lap patch?

A

3/16”

API 653 par 9.3.1.3

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14
Q

What is the maximum allowed thickness for a shell lap patch?

A

½”

API 653 par 9.3.1.3

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15
Q

What is the minimum radius for a shell lap patch?

A

2”

API 653 par 9.3.1.4

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16
Q

What is the required overlap distance for a lap patch when it crosses an existing butt-weld in the shell?

A

6”

API 653 par 9.3.1.5 & Figure 1

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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”

API 653 par 9.3.1.6

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18
Q

What is the maximum allowed size for a shell lap patch?

A

48” high x 72” long

API 653 par 9.3.1.7

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19
Q

What is the maximum shell lap patch dimension?

A

4”

API 653 par 9.3.1.7

20
Q

What is the minimum size hole that can be repaired with a lap patch?

A

2”

API 653 par 9.3.2.1

21
Q

What is the maximum joint efficieny that can be used for a lap patch covering a hole?

A

0.70

API 653 par 9.3.2.3

22
Q

What is the maximum joint efficiency that can be used for a lap patch that is covering a severly deteriorated shell section?

A

0.35

API 653 par 9.3.3.1

23
Q

What is the maximum joint efficiency that can be used for a lap patch that is covering a leaking shell section?

A

0.35

API 653 par 9.3.4.2

24
Q

What is the maximum taper allowed for a shell insert patch?

A

1:4

API 653 par 9.8.4a

25
Q

What is the minimum required overlap of a bottom lap-patch that is used to cover a corroded area (i.e. edge of corrosion to edge ot patch)?

A

2”

API 653 pat 9.10.1.1b & Figure 9.13

26
Q

What is the minimum required distance a bottom lap-patch must be from an existing bottom plate weld?

A

2”

API 653 Figure 9.13

27
Q

What is the maximum dimension of a bottom lap-patch that is within the critical zone?

A

24”

API 653 Figure 9.13 (Note 3)

28
Q

What is the minimum dimension for a welded-on patch for the tank vottom that overlaps a seam or an existing patch?

A

12”

API 653 par 9.10.1.1a & 9.10.1.2

29
Q

What is the required shaped of a floor patch that is within 6” of the shell?

A

Tombstone

API 653 par 9.10.1.2b

30
Q

What is the minimum required thickness of the bottom plate at the lap patch attachment weld?

A

0.100”

API 653 See note above par 9.10.1.2.1

31
Q

What is the maximum thickness of lap-patch in critical zone?

A

¼”

API 653 par 9.10.1.2a

32
Q

Patch plate cannot be installed on the carbon steel tank bottom in the critical zone if the tank’s design temperature exceed what temperature?

A

200°F

API 653 par 9.10.1.2.3

33
Q

Patch plate cannot be installed on the stainless steel tank bottom in the critical zone if the tank’s design temperature exceed what temperature?

A

100°F

API 653 par 9.10.1.2.3

34
Q

Weld repair of pitting within the critical zone is prohibited when sum of the pits in an arc parallel to the shell-to-bottom weld, exceed?

A

2” in a 8” arc

API 653 par 9.10.1.6(a)

35
Q

What is the minimum required thickness of the bottom plate when making a weld repair of pitting within the critical zone?

A

0.100”

API 653 par 9.10.1.6(b)

36
Q

What is the minimum required thickness of a new cone roof (supported type roof)?

A

3/16” plus corrosion allowance

API 653 par 9.11.2.1

37
Q

What is the minimum allowed roof rim thickness for an in-service tank?

A

0.100”

API 653 par 9.13.6.2

38
Q

What is the minimum required thickness of new self-supported cone roof?

A

Greater of 3/16” plus corrosion allowance or API 650 Sections 5.10.5 and 5.10.6

API 653 par 9.11.3.1

39
Q

What is the minimum required thickness for a new roof rim (cone & floating)?

A

3/16”

API 653 par 9.13.6.2

40
Q

What is the maximum nozzle size that can be hot-tapper when the shell is > ½” thick and material is unknown?

A

NPS 4

API 653 par 9.14.1.1 (b)(1)

41
Q

What is the minimum height of tank liquid that is required to be above the hot-tap, when installing a hot-tap in a shell?

A

36”

API 653 par 9.14.1.2

42
Q

How many UT readings are required to be taken along the circumference of the proposed hot tap location?

A

4

API 653 par

43
Q

What is the required NDE for hot-tap nozzle neck-to-shell welds, when the material thoughness is known?

A

MT or PT

API 653 par 9.14.5.1 & 12.1.2.3

44
Q

What is the required thickness for hot-tap nozzles?

A

Extra Strong

API 653 par 9.14.5.1 & Figure 9.14

45
Q

After the nozzle and repad are welded to the shell, how much pressure is required for the pneumatic test of the repad?

A

15 PSI

API 653 par 9.14.5.3 & API 650 par 7.3.5

46
Q

Visual inspection be be conducted when the eye can be placed within [blank] of the surface of the part?

A

6” to 24”

API 653 9.3.1

47
Q

Visual inspection can be conducted when the eye can be placed at an angle not less that [blank] of the surface of the part?

A

30 degrees

API 653 (17 decks)

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