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API-571 Practice Questions

Corrosion and Materials Professional

Last Update 3 months ago
Total Questions : 149

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Question # 21

Which of the following is a contributing factor in caustic corrosion?

Options:

A.  

Iron oxide concentration

B.  

Boiler feed water hardness

C.  

Heat traced equipment

D.  

Alkalinity of superheated steam

Discussion 0
Question # 22

(A section of vacuum bottom outlet piping is being replaced because of naphthenic acid corrosion (NAC). Which of the following potential replacement materials would be most resistant to NAC?)

Options:

A.  

Titanium

B.  

9 Cr-1 Mo steel

C.  

317 stainless steel

D.  

321 stainless steel

Discussion 0
Question # 23

(Resistance to oxidation of steel is best provided by alloying with:)

Options:

A.  

Molybdenum

B.  

Chromium

C.  

Nickel

D.  

Manganese

Discussion 0
Question # 24

Sulfidation of iron-based alloys usually:

Options:

A.  

Occurs in equipment handling sour water

B.  

Occurs only when moisture contacts the surface scale

C.  

Causes wet hydrogen sulfide cracking of hard welds

D.  

Occurs at metal temperatures above 500°F (260°C)

Discussion 0
Question # 25

In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH₄?

Options:

A.  

Hydrogen blistering

B.  

Hydrogen embrittlement

C.  

Hydrogen-induced cracking

D.  

High temperature hydrogen attack

Discussion 0
Question # 26

(Corrosion of carbon steel in sulfuric acid increases significantly below what percent acid concentration?)

Options:

A.  

65

B.  

75

C.  

86

D.  

95

Discussion 0
Question # 27

Which of the following is the main concern for the potential of brittle fracture in typical process service?

Options:

A.  

Start-up and shutdown of equipment

B.  

Overpressure during abnormal operation

C.  

Abnormal, transient stresses on typical process piping

D.  

Cyclic or intermittent services

Discussion 0
Question # 28

In a naphthenic acid corrosive (NAC) environment, what is the effect of sulfur?

Options:

A.  

No effect

B.  

Sulfide cracking

C.  

Inhibition

D.  

Corrosion accelerator

Discussion 0
Question # 29

Carbonate stress corrosion cracking and alkaline stress corrosion cracking are:

Options:

A.  

Not preventable by post-fabrication stress relieving of weldments.

B.  

Closely related corrosion mechanisms.

C.  

Mechanisms that affect carbon steels and austenitic stainless steels.

D.  

Different only in the level of alkalinity needed to initiate attack.

Discussion 0
Question # 30

In steam-generating equipment, caustic corrosion is best prevented through:

Options:

A.  

keeping temperature below the maximum of 250°F (120°C).

B.  

use of 300 series stainless steels.

C.  

proper design.

D.  

acid injection to balance pH.

Discussion 0
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