Free API API-571 Practice Test & Real Exam Questions

Exam Code/Number: API-571
Exam Name/Title: Corrosion and Materials Professional
Certification Provider: API
Corresponding Certification: ICP Programs

Exam Questions: 151
Updated On: Jun 24, 2026

Question #51

What arbitrary value of hydrogen sulfide in water is often used as the defining concentration where cracking damage becomes a problem in carbon steel pipe?

A. 50 ppmw

B. 0.5%

C. 0.05%

D. 1 ppmw

Discussion 0

Correct Answer: A Vote an answer

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Question #52

In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?

A. Carbonates

B. Cyanides

C. Amines

D. Polythionic acid

Discussion 0

Correct Answer: B Vote an answer

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Question #53

Short-term stress rupture is a/an:

A. cracking failure caused by sulfides formed at elevated temperature that convert to acids on exposure to moisture and oxygen.

B. elevated temperature failure caused by diffusion of hydrogen into the material, typically characterized by blistering and cracking.

C. failure caused by repeated cycling from elevated temperature, typically characterized by through-wall oxide filled ruptures with little bulging.

D. elevated temperature failure caused by localized overheating, typically characterized by bulging and thinning.

Discussion 0

Correct Answer: D Vote an answer

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Question #54

How can temper embrittlement be prevented if a material contains critical levels of the appropriate impurity elements and is exposed in the embrittling temperature range?

A. Embrittlement cannot be prevented

B. Use of a controlled pressurization sequence

C. Specification of Charpy V-notch impact test

D. Postweld heat treatment (PWHT) of repairs

Discussion 0

Correct Answer: C Vote an answer

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Question #55

Internal galvanic corrosion in piping near the joint of two dissimilar metals is best detected by external:

A. Ultrasonic thickness testing

B. Metallographic examination

C. Eddy-current testing

D. Liquid-penetrant testing

Discussion 0

Correct Answer: A Vote an answer

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Question #56

Which of the following is a critical factor for chloride stress corrosion cracking?

A. Presence of nickel content higher than 35%

B. Presence of oxygen

C. Presence of nickel content less than 8%

D. Use in an alkaline pH region

Discussion 0

Correct Answer: B Vote an answer

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Question #57

The type of organic acids in crude feedstocks that are of most concern for corrosion in crude unit overheads are those:

A. With naphthenic acids

B. That condense above the water dew point

C. That are not soluble in naphtha

D. With low molecular weight

Discussion 0

Correct Answer: B Vote an answer

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Question #58

Caustic corrosion is most often associated with:

A. Caustic storage tanks (non-postweld heat treated)

B. Caustic treaters

C. Boilers and steam generating equipment

D. Caustic injections in crude units

Discussion 0

Correct Answer: D Vote an answer

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Question #59

Dissimilar metal weld cracks (between ferritic and austenitic materials) form:

A. At the toe of the weld in the heat-affected zone of the ferritic material.

B. In the parent metal on the austenitic side of the weld.

C. In the center of the dissimilar weld.

D. At the toe of the weld in the heat-affected zone of the austenitic material.

Discussion 0

Correct Answer: A Vote an answer

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Question #60

(Which of the following is the appropriate method for monitoring hydrochloric acid corrosion susceptibility in an atmospheric crude unit?)

A. Ultrasonic thickness measurements of water injection points

B. Using strategically placed corrosion probes or corrosion coupons

C. Measuring the pH of the water in the boot of the overhead accumulator

D. Manual or automatic ultrasonic scanning or profile radiographing of piping, vessels, and exchangers in the system

Discussion 0

Correct Answer: C Vote an answer

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