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api 570 > API 571 > Flashcards

API 571 Flashcards

1
Q

Amine Stress Corrosion Cracking - most often found at? and appearance

A
  1. found at or adjacent to non-postweld-heat-treated carbon steel welds or in
    highly cold worked parts.
  2. localized corrosion
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2
Q

Amine Stress Corrosion Cracking-Affected Material?

A

Carbon steel and low-alloy steels.

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3
Q

ATMOspheric Corrosion-description?

A

Corrosion that occurs from moisture associated with atmospheric conditions. Marine environments and moist, polluted industrial environments with airborne contaminants are the most severe.

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4
Q

Atmospheric Corrosion-Affected Material?

A

Carbon steel, low-alloy steels, and copper alloyed aluminum

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5
Q

Boiler Water and Stream Condensate Corrosion-due to?

A

result of dissolved oxygen and/or carbon dioxide, Flow accelerated corrosion (FAC) in these systems may occur either as general wall thinning corrosion or localized corrosion at high velocity, high turbulence, or change of flow direction locations

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6
Q

Boiler Water and Stream Condensate Corrosion-Affected Material?

A

Carbon steel and low-alloy steels.

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7
Q

Caustic Corrosion-Affected Material?

A

Primarily carbon steel, low-alloy steels, and 400 series SS.

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8
Q

Caustic Corrosion-likely to occur at what temp?

A

In high-solution-strength caustic, temperatures above about 170 °F (75 °C)

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9
Q

Caustic Corrosion-damage appearance?

A

Caustic gouging is typically characterized by localized metal loss,

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10
Q

Caustic Stress Corrosion Cracking

A

equipment exposed to caustic at elevated temperature, primarily adjacent to non-PWHT’d welds.

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11
Q

Caustic Stress Corrosion Cracking-Affected Material?

A

Carbon steel, low-alloy steels, and 300 series SS are susceptible.

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12
Q

Caustic Stress Corrosion Cracking-Prevention/Mitigation

A

A heat treatment at 1150 °F (620 °C) minimum with a minimum holding time of 1 hr is considered an effective stress relieving heat treatment for carbon steel.

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13
Q

Corrosion Under Insulation-critical factors (temps)

A
  1. carbon steel, low-alloy steel, and 400 series SS equipment operating between 10 °F (−12 °C) and 350 °F (175 °C).
  2. For 300 series SS, where Cl− SCC is the concern, refiners generally focus on the temperature range of
    140 °F (60 °C) to 350 °F (175 °C).
  3. or duplex stainless steel, where Cl− SCC is the concern, refiners generally focus on the temperature
    range of 280 °F (140 °C) to 350 °F (175 °C).
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14
Q

Corrosion Under Insulation-Affected Material?

A

Carbon steel, low-alloy steels, 300 series SS, 400 series SS, and duplex stainless steels.

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15
Q

Sulfidation-damage description?-Affected Material?

A

carbon steel, low-alloy steels, 400 series SS, and 300 series SS. Nickel-based alloys

NOT ALUMINUM

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16
Q

Sulfidation-Inspection and Monitoring?

A

UT thickness measurement or RT

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17
Q

Thermal Fatigue-appearance of damage

A

dagger shaped, transgranular, and oxide filled, transverse

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18
Q

Erosion/Erosion – Corrosion-Affected Material?

A

All metals, but mostly carbon steel and copper alloys in refining. Refractories are also affected.

aluminum susceptible too

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19
Q

Erosion/Erosion – appearance of damage

A

localized loss in thickness in the form of

grooves, gullies, waves, rounded holes, valleys,

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20
Q

Hydrochloric Acid Corrosion-affected materials

A

all common materials

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21
Q

Mechanical Fatigue (Including Vibration-induced Fatigue) - appearance of damage

A

clam shapes / beach marks

22
Q

Galvanic corrosion-damage appearance (3)

A

crevic, groove or pitting

23
Q

Galvanic corrosion-affect metal?

A

all metals except noble metals

24
Q

Corrosion Under Insulation-appearance (3)

A

loose flaky scale, pitting, localized thickness loss

25
Q

Microbiologically Influenced Corrosion-description of damage

A

Corrosion caused by living organisms such as bacteria, algae, or fungi.

26
Q

Microbiologically Influenced Corrosion-affect metal?

A

carbon and alloy steels, 300 series SS and 400 series SS, aluminum alloys, copper alloys, and some nickel alloys.

Titanium appears to be highly resistant.

27
Q

Microbiologically Influenced Corrosion-affect equipments

A

MIC is often found in water-cooled heat exchangers,

low flow i

28
Q

Microbiologically Influenced Corrosion-damage appearance (3)

A

localized pitting under deposits or tubercles that shield the organisms.

AND

Cup shapes pits

29
Q

Soil Corrosion-affected metals

A

Carbon steel, cast iron, and ductile iron.

30
Q

Soil Corrosion-damage appearance (2)

A

localized pitting, thinning

31
Q

Sulfidation-Appearance (2)

A

uniform thinning, high velocity erosion/corrosion

32
Q

Corrosion rates increase with increasing metal temperature up to the point where the water evaporates quickly at wat temp?

A

212F

33
Q

CUI is most severe at?

A

above 212F

34
Q

Boiler Water and Stream Condensate Corrosion-damage appearance

A

pitting

35
Q

chloride SCC method of inspection

A

PT and Phase analysis eddy current

36
Q

chloride SCC - nickel content % = highly resistant?

A

Alloys with nickel contents above 35 % are highly resistant

37
Q

brittle fracture - affect metals

A

CS, low alloys, 400 SS

38
Q

thermal fatigue/ mechanical fatigue- affected metals

A

all metals

39
Q

resistance to sulfidation increase with?

A

chromium

40
Q

fatigue cracking cause by high cycle fatigue can be difficult to detect b/c

A

time between crack initiation and failure is too short

41
Q

brittle fracture occurs (2)

A
  1. less than 8ksi

2. greater than 25% of test pressure

42
Q

threaded connections are especially susceptible to ?

A

boiler water and steam condensate

43
Q

atm corrosion rate increase with metal temp (F)

A

up 250F

44
Q

what is resistance to chloride cracking

A

nickel based

45
Q

size of the fillet weld name is

A

leg

46
Q

sulfication accelerate by the presense

A

of hydrogen

47
Q

hydrochloric acid increase with increasing

A

temp

48
Q

chloride stress corrosion cracking occurs above

A

140F

49
Q

predominate factor for mechanical fatigue

A

surface notices

50
Q

BNH

A 
Carbon Steel 200
C-1/2 Mo 225
1-1/4 Cr-1/2 Mo 225
2-1/4 Cr-1 Mo 241
5, 7, 9, Cr-Mo 241
12 Cr 241
51
Q

Best inspection for CSS

A

phase array and PT

api 570 (17 decks)

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