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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 # 1

(Graphitization occurs in:)

Options:

A.  

Aluminum

B.  

Stainless steel

C.  

Carbon steel

D.  

Monel

Discussion 0
Question # 2

The stream from a crude atmospheric overhead goes to the tube side of a shell-and-tube condenser with a temperature of 300°F (149°C) and a pressure of 10 psig (69 kPa). As the stream begins to condense water, its hydrochloric acid content lowers the water pH to about 4.0. Which of the following would be the best alloy selection for the tubes with cooling water on the shell side?

Options:

A.  

410 Stainless Steel

B.  

Titanium

C.  

9 Cr-1 Mo Steel

D.  

316 Stainless Steel

Discussion 0
Question # 3

Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

Options:

A.  

Two phase

B.  

Hydrocarbon phase

C.  

Water phase

D.  

Vapor phase

Discussion 0
Question # 4

(Which of the following damage mechanisms affects most common materials of construction?)

Options:

A.  

Sour water corrosion

B.  

Microbiologically induced corrosion

C.  

Polythionic acid corrosion

D.  

Amine corrosion

Discussion 0
Question # 5

Polythionic acid stress corrosion cracking (PTASCC) can be detected by:

Options:

A.  

Hardness measurements

B.  

Magnetic particle testing

C.  

Liquid penetrant testing

D.  

Ultrasonic thickness measurements

Discussion 0
Question # 6

Which of the following will be most effective in finding sour water corrosion?

Options:

A.  

Spot ultrasonic testing

B.  

Profile radiographic testing

C.  

Guided wave ultrasonic testing

D.  

Angle beam ultrasonic testing

Discussion 0
Question # 7

H₂S content, pH, temperature, velocity, and oxygen concentration are critical factors of:

Options:

A.  

Sour water acid corrosion

B.  

Sulfuric acid corrosion

C.  

Naphthenic acid corrosion

D.  

Polythionic acid cracking

Discussion 0
Question # 8

(Caustic stress corrosion cracking can be effectively prevented by:)

Options:

A.  

The use of 300 series stainless steels

B.  

The use of a stress-relieving treatment

C.  

Limiting caustic concentration to less than 100 ppm

D.  

Limiting metal temperatures to less than 150 °F (65 °C)

Discussion 0
Question # 9

Corrosion rates associated with hydrofluoric (HF) acid would be expected to increase if:

Options:

A.  

Copper-nickel alloy is used

B.  

Temperature and water content increase

C.  

Temperatures are below 150°F (66°C) and there is less than 3% water

D.  

HF acid concentration increases

Discussion 0
Question # 10

Severe internal grooving corrosion is found at the bottom of a 4-inch (101.6 mm) carbon steel piping system in steam condensate service. Which of the following is the most likely cause?

Options:

A.  

Carbon dioxide corrosion

B.  

Carbonate corrosion

C.  

Ammonium bisulfide corrosion

D.  

Erosion-corrosion

Discussion 0
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