API Certification: Eligibility, Exams, and Renewal

API certification is a credential issued by the American Petroleum Institute that qualifies individuals to inspect pressure vessels, piping, storage tanks, and pipelines at refineries, petrochemical plants, and related facilities. The three flagship inspector programs (API 510, 570, and 653) are administered through API’s Individual Certification Programs and accredited by the American National Standards Institute.¹ To earn one, you need to meet education and experience thresholds, submit a verified application, and pass an exam that can run as long as 7.5 hours.

Which Certification You Need

The three core inspector credentials each cover a specific equipment category and its governing inspection code.

API 510 — Pressure Vessel Inspector. Maintenance, inspection, repair, and alteration of stationary pressure vessels that hold gases or liquids under pressure.²
API 570 — Piping Inspector. In-service metallic piping systems carrying process fluids, hydrocarbons, and hazardous chemicals.³
API 653 — Aboveground Storage Tank Inspector. Inspection, repair, alteration, and reconstruction of large aboveground petroleum storage tanks.⁴

Several additional certifications sit alongside the core three. API 580 covers risk-based inspection; anyone holding a current 510, 570, or 653 automatically qualifies to sit for it.⁵ API 571 tests knowledge of damage mechanisms affecting fixed refining equipment.⁶ API 1169 is the pipeline construction inspector credential, built around federal pipeline safety regulations at 49 CFR 192 and 49 CFR 195.⁷ Narrower programs exist for source inspection (SIFE, SIRE, SIEE), thermal and electrical safety, and quality auditing; fees and formats vary.⁸

Who Qualifies to Apply

Every certification requires a combination of education and inspection experience, and the two trade off against each other. For 510, 570, and 653, the tiers are:

Bachelor’s degree or higher in engineering or technology: 1 year of relevant inspection experience.
Two-year associate’s degree or certificate in engineering or technology: 2 years.
High school diploma or equivalent: 3 to 5 years, depending on the specific certification.
No formal education: 5 or more years.

The experience must involve directly performing or supervising inspection work on the equipment type the certification covers. General industry employment without hands-on inspection does not count. For API 580, holding a current 510, 570, or 653 satisfies eligibility outright, regardless of your education.⁵

How to Apply and What It Costs

Applications go through the API Individual Certification Programs portal. You create an account, enter your employment history, and upload supporting documents.⁹ API runs random audits, and providing false information can result in a permanent ban from the program.

Employment Verification

For every employer you list, you need the name and business email address of both a supervisor and a manager or HR representative who can verify your experience. The system rejects public-domain addresses like Gmail or Hotmail. The two references cannot be the same person. Self-employed candidates may list clients instead.¹⁰ Qualification decisions rest entirely on experience your employer confirms, so line up cooperative references before you start the application.

Fees

Initial certification for 510, 570, and 653 runs $875 for API members and $1,125 for non-members. API 1169 is $435 for members and $580 for non-members. Smaller certifications like 571 and 580 run roughly $380 to $440 for non-members.¹¹ Payment is handled online by credit card or electronic funds transfer.

Deadlines

Each exam window has a fixed application deadline, typically two to three months before testing opens. The September 2026 window for API 510, for example, closes to applications on July 3, 2026. Late applications are still accepted, but a $200 late fee is added on top of the certification cost.¹¹

What the Exam Looks Like

Once your application is approved, API sends an authorization email with an Eligibility ID and instructions for scheduling through Prometric testing centers.¹² Some exams are also available in a remotely proctored online format.¹³

Core Inspector Exams

The 510, 570, and 653 exams share the same structure. Expect a 7.5-hour day: a short tutorial, a 2.75-hour closed-book section, a 45-minute lunch, and a 3.75-hour open-book section. The exam has 170 multiple-choice questions in total (110 closed-book, 60 open-book), of which 140 are scored.²

The closed-book section tests retention of fundamental inspection principles. The open-book section measures how quickly you can navigate code documents under pressure. During that portion you work from digital PDFs of the permitted references on the testing computer. Physical books, personal notes, and paper are not allowed in the room.⁸ The exact editions of the references you need appear on the Publications Effectivity Sheet for your exam window. API updates that sheet periodically, so confirm you are studying the right edition before test day.

Other Formats

Not every API exam follows the 7.5-hour pattern. API 1169, for example, runs 3 hours with 115 questions (100 scored, 15 pretest), and the references are provided on the testing computer rather than brought in by the candidate.⁷ Check the Body of Knowledge document for your specific certification to confirm question count, time limit, and permitted materials.

If You Fail

If you don’t pass, you submit a new application and schedule for a future window. API does not publish a separate retest fee; the standard application fee applies. The same process applies if you fail to schedule within your assigned window after approval.¹²

Keeping the Certification Active

API 510, 570, and 653 certifications are valid for three years.⁸ When the term is up, you can recertify either by sitting the exam again or by documenting Continuing Professional Development activities.¹⁴

The CPD path requires at least 24 hours of qualifying professional development during each three-year cycle, with no more than 16 hours from any single category. Activities must be relevant to the scope of your certification and logged in the API online portal. Separately, you need to maintain verified inspection experience for at least 20 percent of the preceding three years.

Recertification is cheaper than first-time certification. For 510, 570, and 653, members pay $745 and non-members pay $855.¹¹

Grace Period and Expiration

You can apply to recertify starting 90 days before your certification expires. If you miss that window, a 90-day grace period after expiration gives you a last chance to apply, though late fees apply. Let the grace period lapse and the certification expires completely. At that point you have to submit a new application at full price and pass the full exam again as a first-time candidate.⁸ Put the renewal date on your calendar well in advance.

1
American Petroleum Institute. Individual Certification Programs
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American Petroleum Institute. API 510 – Pressure Vessel Inspector
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American Petroleum Institute. API 570 – Piping Inspector
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American Petroleum Institute. API 653 – Aboveground Storage Tank Inspector
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American Petroleum Institute. API 580 – Risk Based Inspection
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American Petroleum Institute. API 571 – Corrosion and Materials
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American Petroleum Institute. API 1169 – Pipeline Construction Inspector
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American Petroleum Institute. API Individual Certification Programs
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American Petroleum Institute. API ICP Certification Applications
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American Petroleum Institute. ICP Application Submission User Guide
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American Petroleum Institute. API ICP Schedules and Fees
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American Petroleum Institute. API Individual Certification Programs – Schedule Exams
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Prometric. American Petroleum Institute Individual Certification Programs
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American Petroleum Institute. Recertification Requirements – Continuing Professional Development