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API 653 > Section 4 > Flashcards

Section 4 Flashcards

Suitability for Service

1
Q

A tank roof shall be repaired or replaced when the thickness in a 100 in2 area is less than?

A

0.09”

API 653 par 4.2.1.2

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2
Q

Who determines the inspection method to be used to evaluate roof support members?

A

Tank Inspector

API 653 par 4.2.2.1

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3
Q

What performing an internal inspection, close attention must be made to what members?

A

Pipe columns

API 653 par 4.2.2.1

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4
Q

What must be repaired on a floating roof if discovered during inspections?

A

Cracked, punctured areas or areas that may hole through before the next inspection

API 653 par 4.2.3.1 thru 4.2.3.4

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5
Q

What code and code section(s) should be used to evaluate floating roofs?

A

API 650 Annex C for external floating roofs and API 650 Annex H for internal floating roofs

API 653 par 4.2.3.4

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6
Q

What code can be used to evaluate pits or Localized Thin Areas (LTAs) as an alternative to evaluation using API 653?

A

ASME Section VIII, Div 2

API 653 par 4.3.3.6

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7
Q

What API 650 Appendix is used to evaluate frangible roof joints

A

Appendix F

API 653 par 4.2.4.1

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8
Q

What is the temperature range when API 650 Annex M is required to evaluate a tank?

A

> 200°F, but less than 500°F

API 653 par 4.3.10

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9
Q

When evaluating a LTA, how many UT reading are required to be taken over each vertical line?

A

Minimum of 5

API 653 par 4.3.2.1c

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10
Q

What joint efficiency should be used when evaluating the retirement thickness in a corroded plate, and the (Locally Thinned Area) LTA is away from welds or joints by at least the greater of 1” or twice the plate thickness?

A

1

API 653 par 4.3.3.1 (‘E’ description)

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11
Q

What is the minimum required thickness allowed for Tmin of a shell course

A

0.100”

API 653 par 4.3.3.1 (Tmin description)

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12
Q

What is the ‘standard’ joint efficiency in API 650 when evaluating the retirement thickness of an unknown material for a butt weld?

A

1

API 653 par 4.3.3.1 & Table 4.2

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13
Q

Above what tank diameter should the varible design point method be used to calculate the minimum required shell thickness?

A

> 200’ in diameter

API 653 par 4.3.3.4 & API 650 par 5.6.4

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14
Q

What joint efficiency should be used when evaluating the retirement thickness in a corroded plate, and the LTA (Locally Thinned Area) is 6” or more away from the rivets?

A

1

API 653 par 4.3.4.1

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15
Q

When calculating the minimum required thickness for a corroded section of tank shell, what is the minimum distance that corrosion must be away from a rivet to get a joint efficiency of 1?

A

6”

API 653 par 4.3.4.1

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16
Q

What codes can be used to evaluate shell welds?

A
  • API 653
  • API 650
  • API 579

API 653 par 4.3.8

17
Q

A welded tank is considered to be in ‘evelated temperature’ service when the operating themperature exceeds ____°F, but less than _ °F?

A

200°F & 500°F

API 653 par 4.3.10

18
Q

What yield strength should be used if the shell material is unknown?

A

30,000 PSI

API 653 par 4.3.10.1.1a

19
Q

How often must the tank bottom be evaluated?

A

Less than or equal to Internal Inspection Internal

API 653 par 4.4.1

20
Q

Can the tank bottom be evaluated without entry into the tank? If so, how?

A

YES, by use of leak detection test/monitoring systems that could detect a leak

API 653 par 4.4.1

21
Q

Why would you monitor foundation settlement?

A

To assess the integrity of the tank bottom

API 653 par 4.4.1

22
Q

What is the meaning of RPS?

A

Release Prevention System

API 653 par 4.4.3

23
Q

What is the purpose of a Tank Bottom Release Prevention System (RPS)?

A

To maintain tank integrity and protect the environment

API 653 par 4.4.3

24
Q

What is the meaning of RPB?

A

Release Prevention Barrier

API 653 par 4.4.3.5

25
Q

What is the purpose of a RPB?

A

Prevent a release of material and enable leak detection

API 653 par 4.4.3.5

26
Q

What are two NDE methods that are normally used to determine tank bottom corrosion?

A

UT & MFL

API 653 par 4.4.4

27
Q

What is the minimum thickness allowed for a tank’s bottom plate by the next inspection when there is a mean of detection and containment?

A

0.05”

API 653 par 4.4.5.3 and Tab

28
Q

What is the minimum thickness allowed for a tank’s bottom plate by the next inspection when there is no means of detection and containment?

A

0.100”

API 653 par 4.4.5.3 & Table 4.4

29
Q

What is the minimum thickness allowed for a tank’s bottom plate by the next inspection when there is a applied tank bottom reinforced lining that is greater than 0.05” thick?

A

0.05”

API 653 par 4.4.5.3 & Table 4.4

30
Q

What is the thinnest that a shell botom plate can be in the critical zone?

A

Smaller of ½ of the original plate thickness (not including corrosion allowance) or 50% of tmin, but not less than 0.100”

API 653 par 4.4.5.4

31
Q

What is the minimum required thickness of the projection of the bottom plate outside the bottom-to-shell, for an inservice tank?

A

0.100”

API 653 par 4.4.5.7

32
Q

How far must the bottom plate extend past the bottom-to-shell (toe of the botom-to-shell weld), for an in-service tank?

A

3/8”

API 653 par 4.4.5.7

33
Q

What is the minimum required thickness of the annular plate?

A

0.100”

API 653 par 4.4.6.1

34
Q

What is the minimum required thickness of the annualar plate that contain a product with a specific gravity of less than 1?

A

0.170”

API 653 par 4.4.6.2 & Table 4.5

API 653 (17 decks)

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