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- Total Questions: 151
- Updated on: Nov 03, 2026
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API-571 Desktop Test Engine
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- Total Questions: 151
- Updated on: Nov 03, 2026
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- Total Questions: 151
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API API-571 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mechanical and Metallurgical Failure Mechanisms | 15% | - Brittle Fracture - Creep and Stress Rupture - Thermal Fatigue - Mechanical Fatigue |
| Topic 2: Other Damage Mechanisms | 15% | - Erosion and Erosion-Corrosion - Microbiologically Influenced Corrosion - Liquid Metal Embrittlement - Cavitation Damage |
| Topic 3: Environmentally Assisted Cracking | 25% | - Sulfide Stress Cracking - Caustic Stress Corrosion Cracking - Hydrogen Embrittlement - Chloride Stress Corrosion Cracking |
| Topic 4: Uniform or Localized Loss of Thickness | 25% | - Corrosion Under Insulation (CUI) - Sulfidation - Hydrochloric Acid Corrosion - Oxidation and Scaling - Ammonium Bisulfide Corrosion |
| Topic 5: Terms, Definitions, and Acronyms | 5% | |
| Topic 6: High-Temperature Corrosion and Degradation | 15% | - Carburization - Graphitization - Decarburization - Metal Dusting |
API-571 Exam Essentials and Our Service System
Currently, the API-571 exam's passing score is 70% / Scaled score determined by API and the registration fee is $440 USD. Both are API's figures and subject to revision — verify them on the official site before you schedule.
API recommends these official training resources:
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Reliability here is built, not claimed. The API-571 bank is written by a team of IT experts and certified trainers with a wealth of knowledge in the API Corrosion and Materials Professional field, and we constantly keep it updated. The online test engine is the signature service: it fits the atmosphere of the actual test in advance, supports Windows, Mac, Android, and iOS, carries no installation limits, and lets you practice anytime, anywhere — perfectly suited to IT workers. Download the free sample first to learn about the product, and know that after purchase you may request the latest version at any time on top of 365 days of automatic updates.
The API Corrosion and Materials Professional blueprint covers these core domains:
- Other Damage Mechanisms (15%)
- Uniform or Localized Loss of Thickness (25%)
- High-Temperature Corrosion and Degradation (15%)
Further domains complete the official outline; the bank addresses every one.
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API states the following prerequisites for the API Corrosion and Materials Professional: Hold current API 510, 570 or 653 certification; or meet education + experience requirements: BS/BS in engineering/tech + 1 year, 2-year degree + 2 years, high school + 3 years industry experience (past 10 years).
Confirm the details on the official certification page before registering.
According to the latest exam information, the API-571 exam includes 110 (100 scored, 10 unscored pretest) questions and allows 195 minutes minutes. The online engine reproduces those conditions so practice matches the formal test's atmosphere.
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API Corrosion and Materials Professional Sample Questions:
Naphthenic acid corrosion (NAC) is most severe in what phase of flow?
- A. Hydrocarbon phase
- B. Two phase
- C. Vapor phase
- D. Water phase
Correct Answer: B 🗳️
Explanation: Only visible for TestKingsIT members. You can sign-up / login (it's free).
Differential expansion in bimetallic welds can give rise to:
- A. Galvanic cracking
- B. Reheat cracking
- C. Stress corrosion cracking
- D. Thermal fatigue
Correct Answer: D 🗳️
Explanation: Only visible for TestKingsIT members. You can sign-up / login (it's free).
Microbiologically induced corrosion is largely independent of the:
- A. Water content of the process
- B. Velocity of the flow stream
- C. Presence of hydrogen sulfide
- D. pH of the fluid
Correct Answer: B 🗳️
Explanation: Only visible for TestKingsIT members. You can sign-up / login (it's free).
The type of organic acids in crude feedstocks that are of most concern for corrosion in crude unit overheads are those:
- A. With low molecular weight
- B. That are not soluble in naphtha
- C. With naphthenic acids
- D. That condense above the water dew point
Correct Answer: D 🗳️
Explanation: Only visible for TestKingsIT members. You can sign-up / login (it's free).
Aggressive ammonium chloride corrosion often occurs:
- A. When excess water washing dissolves too much ammonium chloride.
- B. When the salts precipitate from high-temperature streams as they cool.
- C. When dry salts are exposed to a small amount of free water.
- D. In the absence of a free water phase.
Correct Answer: C 🗳️
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