For inspectors and engineers sitting API 571
API 571 course and practice exams
Closed-book recall on RP 571 damage mechanisms, on the clock.
Plans and prices
Exam dateOptional
Pick one and we'll suggest a plan.
Ask Patch about this course AI
Tap a question, or type your own. With API 571 course: up to 40 messages a day.
Answers come from this course's own plans and contents.
- 6 modules of lessons, each with a short check
- 2 timed exams at real length: 110 questions, 195 minutes
- 101 flashcards with spaced review
Lifetime access, including your retake
Not ready? Try the free 10-question check
Other options
Have my manager pay instead
Everything in API 571 course
Learn each family of damage mechanisms, then prove it on closed-book timed exams.
- 6 lesson modules covering every task in API's API 571 outline
- A week-by-week study plan built from your free check and exam date
- 249 original questions, each explained with the reference it uses
- 2 full-length timed exams (110 questions, 195 minutes), weighted like the real exam
- After each timed exam, see how each domain moved since your last one
- Domain scores after every drill show what to study next
- Exam-day checklist: what to bring, allowed references and the calculator rules
- Today's 10: ten a day, and every miss comes back until you get it right
- Listen to Today's 10 on the go
- Readiness by domain, from your own practice results
- Every question, reshuffled into new sets aimed at your weakest domain
- Flashcards for every domain, with spaced review
- Patch, your AI study assistant
Best if: You want a structured path through RP 571 for the API 571 exam.
What's covered
- How RP 571 describes damage: terms, acronyms and the eight attributes
- Metal loss in the atmosphere, soil and water
- Mechanical and metallurgical damage
- High-temperature corrosion and hydrogen attack
- Environment-assisted cracking
- Process-unit corrosion in refining
In API 571 course
- 249original questions
- 2timed exams at real length
- 6modules of lessons
- 101flashcards
See how Patch answers
Working out a corrosion rate
A wall reads 0.500 inch, then 0.480 inch four years later. What is the corrosion rate?
You: How do I get a corrosion rate from two thickness readings?
Patch: Subtract the later reading from the earlier one to get the metal lost, then divide by the years between the readings. Losing 0.020 inch over 4 years is 0.005 inch a year.
Key point: Corrosion rate is metal lost divided by the time between readings.
An original example, not an exam question. AI can be wrong, so check it against your course.
What members get
With the course.
Today's 10 10 questions a day from your misses and your weakest domain, so what you got wrong comes back. Plus a missed set of up to 50.
A plan to your exam date Set your date and get a week-by-week plan you can add to your calendar in one tap.
Readiness by domain Your practice results against a 75% study target, and how they moved this week. A study target, not a pass prediction.
- Timed exams on the real clock. A live pace line, and Save and exit when you need a break. You pick up with the time you had left.
- An exam-day guide. What to bring, the references you may use and the calculator rules.
- 249 original questions, every one explained. Review every miss after each timed exam. Practice sets show you the ones you haven't seen first.
- Wrong answer key? We fix it within 2 business days and log it publicly.
- One payment. No subscription, nothing renews.
- Didn't pass? Every plan except the 7-day pass has lifetime access. Your retake prep is already paid for.
Practice drawn to the API 571 outline: every domain at its exam weight
- Terms, definitions and acronyms13%
- Damage mechanisms: description, affected materials and critical factors30%
- Damage mechanisms: affected units and equipment13%
- Damage mechanisms: appearance or morphology of damage17%
- Damage mechanisms: prevention and mitigation13%
- Damage mechanisms: inspection and monitoring14%
See the numbers
Each domain's weight on the API 571 outline, as our timed exams draw it, beside its share of the 249-question bank.
| Domain | Outline | Bank |
|---|---|---|
| Terms, definitions and acronyms | 13% | 13% |
| Damage mechanisms: description, affected materials and critical factors | 30% | 30% |
| Damage mechanisms: affected units and equipment | 13% | 13% |
| Damage mechanisms: appearance or morphology of damage | 17% | 17% |
| Damage mechanisms: prevention and mitigation | 13% | 13% |
| Damage mechanisms: inspection and monitoring | 14% | 14% |
Next API 571 window: Apr 2027. API's application deadline is 4 Feb 2027.
Instant access. Everything in the plan you choose opens as soon as checkout completes.
See the teaching before you buyRead a complete lesson from the course, “Metal loss in the atmosphere, soil and water”, and try a short practice set with full explanations. Free, no signup.
Read the free lessonWhat the course covers
6 modules covering every task in the API 571 outline.
- How RP 571 describes damage: terms, acronyms and the eight attributes (4 sections)
- Metal loss in the atmosphere, soil and water (5 sections)
- Mechanical and metallurgical damage (5 sections)
- High-temperature corrosion and hydrogen attack (5 sections)
- Environment-assisted cracking (5 sections)
- Process-unit corrosion in refining (5 sections)
Questions
When do I get access?
Straight away. Checkout takes you to your course, and the receipt email has the same link.
How do I get back into my course?
Use the link in your receipt email. If you can't find it, enter your email on the course page and we resend it to the address on your order.
Is 249 questions enough?
Each one comes with a worked explanation and its reference. You also get 18 end-of-module checks. Today's 10 and your missed set bring your misses back on later days, so you work the bank instead of reading it once.
Can I get a refund?
Eligibility depends on your plan, when you request a refund and your paid use. See the refund terms for the conditions and exceptions.
What if I need a retest?
Keep studying in the same course. Your access has no end date, so your retake prep is already paid for, and your practice history, missed questions and readiness by domain are still there. The 7-day pass is the exception: it ends after 7 days.
How long do I keep access?
Lifetime access: your access has no end date. Updates are included, so if American Petroleum Institute moves this exam to a newer code edition while you have access, your course moves with it. The 7-day pass is the exception. 7-day pass: access ends 7 days after payment, to the minute. It does not renew and is not a subscription. A timed practice exam started before then can still be finished.
More questions (6)
If I buy the 7-day pass now, is its price taken off a bigger plan later?
No. Each plan is a separate purchase at its listed price, and the $39 paid for the 7-day pass is not credited toward another plan. With more than a week before your exam, a full plan is the better buy.
Are the questions copied from the exam?
No. Every question is original and written to American Petroleum Institute's published content outline. Exam content is confidential and we never use it. We are not affiliated with or endorsed by American Petroleum Institute.
How are the questions written?
In our own words, to API's current published outline. See how many questions cover each domain.
Can my employer pay?
Yes. Pay at checkout and we email a receipt you can expense, or download a reimbursement request to send your manager.
Is Patch AI?
Yes. Patch is an AI study assistant, not a person or an instructor. Check important details against your lessons and references.
Can you promise I will pass?
No, and nobody honest can. We promise everything listed in your plan, and a fix within 2 business days for any wrong answer key.
Employer paying?
Many employers fund API 571 prep. Generate a reimbursement request PDF to send to your manager. Buying for a crew? Request a quote