Thickness Flashcards

1
Q

Linings - Thickness of a thin film lining

A

< 0.020”

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2
Q

Bottom - Min allowed bottom plate thickness when there is a reinforced liner that is > 0.050” thick

A

0.050”

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3
Q

Bottom - Min allowed bottom plate thickness when there is a means to detect and contain a leak

A

0.050”

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4
Q

Roofs - Min allowed average thickness of corroded roof plate

A

0.090” in 100in²

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5
Q

Shell - Min arbitrary shell thickness (used when calculated min thickness is below this number)

A

0.100”

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6
Q

Bottom - Min allowed thickness of bottom plate at toe of the external shell-to-bottom fillet weld

A

0.100”

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7
Q

Bottom - Min allowed bottom plate thickness away from crit zone or an annular plate

A

0.100”

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8
Q

Bottom - Min allowed plate thickness in crit zone that can be repaired by weld-buildup

A

0.100”

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9
Q

Roof Rim - Min allowed roof rim thickness

A

0.100”

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10
Q

Roof - Min thickness of new roof plate (cone & floating)

A

3/16”

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11
Q

Roof Rim - Min Thickness of new roof rim

A

3/16”

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12
Q

Bottom - Normal min thickness of new bottom plate

A

1/4”

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13
Q

Bottom Patch - Max thickness of lap-patch in crit zone

A

1/4”

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14
Q

Weld Qual - When can UT be used in lieu of RT to qualify a Welder/Welding Operator

A

≥ 1/4”

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15
Q

Brittle - Thickness when brittle fracture is NOT a concern

A

≤ 1/2”

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16
Q

Shell Patch - Max shell thickness when lap-patches are allowed

A

1/2”

17
Q

Shell Patch - Max patch thickness for a shell lap-patch

A

1/2”

18
Q

NDE - When welding existing shell plate. Thickness that requires 100% examination by RT and MT or PT

A

> 1”

19
Q

NDE - Plate thickness which requires 100% of vertical welds to be RT’d

A

> 1”

20
Q

Reconstruction - Shell plate thickness that requires all welds to be preheated to atleast 200 °F

A

> 1-1/2”

21
Q

Shell Pits - Min remaining thickness allowed below a pit

A

1/2 tmin