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For inspectors and engineers taking the API 571 exam

API 571: name the damage mechanism

Free API 571 practice: 10 questions, answers explained as you go, score by domain.

Free 10-question check

Full course $149: 249 practice questions, each explained. See the course

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Question 1 of 10 · free checkUntimed

Terms, definitions and acronyms

A repair record notes cracking in the HAZ next to a weld. What does HAZ stand for?

Press A-D or 1-4 to choose an answer while this question is on screen.

Choose an answer to begin

API 571 is closed book, so each mechanism's materials, causes and look come from memory. Take the free 10-question check and see which area to study first.

  • 10 questions, untimed
  • Answers explained as you go
  • Scored by domain
Ask Patch AI Explains your misses, answers from this course, and builds practice from your weak spots.Try it free: 3 asks on the free check, 10 more with your email. What Patch can do

Want a timed run? Try the free 25-question mini-mock. The first 5 need no email.

Original practice material. Not affiliated with API.

How it works

  1. Answer 10 questions, freeUntimed. Check each answer to see why it's right, with a hint where one helps.
  2. See your score by domainBroken down by outline domain, with your weakest one named.
  3. Study what you missedAdd your email and exam date for a study plan, or practice at exam pace.

    Want exam pace? Take the 25-question practice test (about 44 minutes)

The API 571 course

Available now · instant access

Learn each family of damage mechanisms, then prove it on closed-book timed exams.

  • 6modules of lessonsEvery task on the outline
  • 2full-length timed exams110 questions in 195 minutes each
  • 249practice questionsEach one explained
  • 1week-by-week study planSet to your exam date

Patch, your AI study assistant, comes with the API 571 course: a week-by-week plan from your exam date and weak areas, step-by-step walk-throughs and a weak-spot quiz. Up to 40 messages a day.

  • My study plan: a week-by-week course from your exam date and weak areas, with today's set ready. Lose a week and I re-plan it
  • Stuck on a question? Tap Walk me through it, Explain like I'm new or Show a worked example
  • A quiz on your weak spots, your misses back on a spaced review, and explain it back to me to lock it in
  • After 30 answers, I show you the patterns in your misses and a practice set for each one
  • Exam week: a day-by-day plan for your last 7 days
See all 6 modules
  1. How RP 571 describes damage: terms, acronyms and the eight attributes
  2. Metal loss in the atmosphere, soil and water
  3. Mechanical and metallurgical damage
  4. High-temperature corrosion and hydrogen attack
  5. Environment-assisted cracking
  6. Process-unit corrosion in refining
API 571 course$149Get the API 571 course · $149

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Every answer comes with a full explanation.

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PatchI'll show you why the right answer works, why each other option falls short, and where to look it up.

Example of how I explain. Answer question 1, then tap Ask Patch why. 3 free asks, 10 more with your email. I'm AI, so check important details against your references. Meet Patch

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Free API 571 study plan

A week-by-week plan from today to your exam, weighted to the published exam outline. We show it here and email you a copy.

Exam at a glance

Format
110 questions in 195 minutesBook: Closed book: paper and reference materials are not allowed into the exam
Delivery
In person at test centers or through remote proctoring
Exam fee (paid to API, not us)
Initial: 2026 Fees tab $380 member / $440 non-member; 2027 Fees tab $390 / $450. Recertification: 2026 $265 / $320; 2027 $270 / $330. Late application $200. Reschedule (new window) $200

What it covers

Terms, definitions and acronyms
Damage mechanisms: description, affected materials and critical factors
Damage mechanisms: affected units and equipment
Damage mechanisms: appearance or morphology of damage
Damage mechanisms: prevention and mitigation
Damage mechanisms: inspection and monitoring

The free 10-question check follows these domains, subject to the available practice questions.

API 571 exam prep FAQ

How long is the free check?

The free check has 10 practice items, is untimed and takes about 18 minutes. You see the answer and explanation after each item.

What does the free check cover?

API RP 571's damage mechanisms: what each one is, the materials and units it affects, how it looks, and how to prevent and find it. You see which area to study first.

Is the check free?

Yes. You can start the check and see your score and weakest area for free, with no signup or payment. Your score in each area unlocks when you add your email.

What do I see after finishing?

You get your score, your weakest area and what the API 571 Corrosion and Materials course holds for it. Add your email to see your score in each area and get a free study plan.

Where do the practice questions come from?

Every question is original and written to API's API 571 Body of Knowledge. We cite RP 571 without reproducing its text. The check does not predict your exam score or certification outcome.

How long is the API 571 exam?

API lists 110 questions in 3.25 hours, closed book, at a test center or by remote proctoring. API's pages differ on how many of the 110 are scored, so we do not state a scored count.

Who can take the API 571 exam?

Holders of a current API 510, 570 or 653 certification qualify automatically. Others qualify by education and petrochemical industry experience, from 1 to 5 or more years depending on education.

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