API 510 certification: requirements, total cost and how long it takes

API 510 exam requirements

API's qualification page gives these minimum combinations:

• Engineering or technology bachelor's degree or higher, or at least three years of technical military service: one year performing or supervising API 510 inspection activities.
• Two-year engineering or technology associate degree or certificate, or two years of technical military service: two years of relevant vessel work, including one year performing or supervising inspection.
• High-school diploma or equivalent: three years of relevant vessel work, including one year performing or supervising inspection.
• No formal education: five or more years of relevant vessel work, including one year performing or supervising inspection.

Relevant vessel work covers design, fabrication, repair, operation or inspection. Experience must fall within the previous ten years and be acquired while employed by, or contracted to, an authorized inspection agency under API 510. Dishonorable discharge disqualifies military-service credit. API verifies the experience documented in your application. These routes come from API 510 Appendix B.

Not sure the work suits you yet? Read what a pressure vessel inspector does day to day first, or see which employers ask for the credential in API 510 jobs: who hires. Qualification depends on duties and dates, not just a job title. Make a work-history checklist showing employers, dates, vessel duties and inspection responsibilities, and who can verify each period. If your experience is on piping or tanks rather than vessels, the API 510 vs 570 vs 653 comparison sets the three programs' requirements side by side.

How to get API 510 certified

1. Check you qualify. Match your education to the routes above, then run your dates through the API 510 eligibility checker. It shows whether you appear eligible now, or when, and lists the next testing windows with their deadlines.
2. Document your experience and references. List employers, dates, vessel duties and who can verify each period. The post on how to document your experience for the API 510 application walks through it.
3. Apply for a window. Pick a testing window and apply before its deadline. The exam schedule and fees guide lists every window, deadline and fee.
4. Sit the exam. After API authorizes you, you book a seat at a Prometric center. The API 510 exam guide covers the format and sections, and the free 10-question check shows where to start studying.
5. Clear your application and receive your certificate. Certification waits until any application deficiencies are cleared, even after a passing result, so check your ICP Portal status.
6. Recertify every three years. Renewal needs work and continuing professional development evidence, plus a web quiz every second renewal. See the API 510 recertification requirements and the recertification quiz guide.

Build the total certification cost

API's fee page lists initial fees of $890 member / $1,140 non-member under its 2027 Fees tab and $875 / $1,125 under its 2026 Fees tab. Every API 510 window still taking applications tests in 2027, and our exam schedule and fees guide lists each one with its deadline.

Use this budget worksheet, or total your own fee, retakes, books and travel in the API exam cost calculator:

• API initial fee: the amount for your application and membership category.
• Authorized references: books or authorized access you still need after checking employer-provided materials.
• Preparation: any course, practice product or other study support you choose.
• Attendance: transport, lodging and meals where needed, plus any unpaid time away from work.
• Contingency: appointment-change, application or repeat-attempt costs.

For example, using the 2027 non-member fee, your planned total is $1,140 plus references, preparation and attendance costs. Subtract any employer reimbursement separately so the full cost and your personal share both stay visible. If your employer may pay, print a one-page cost estimate and hand it in with your request.

API lists a $200 late-application fee and $350 reschedule-application fee. The schedule and fees guide explains these alongside the separate Prometric appointment-change charges.

How long does API 510 certification take?

The timeline has four parts: qualifying experience, application preparation, study and certification processing. The experience requirement is measured in years. Once you qualify, your pace depends on your existing knowledge, your study hours, a complete application and the window you can attend.

A good starting plan is eight weeks with several consistent study sessions each week, adjusted after the free check. Shift work, unfamiliar calculations or missing references may call for more.

API policy makes an application valid for six months from the first exam date requested. The period does not restart with each attempt. Certification also waits until application deficiencies are cleared, even after a passing result, so keep your application complete and check your ICP Portal status before making work or travel commitments.

Turn the requirements into a study plan

Use the Body of Knowledge to organize preparation around calculations, welding qualification review, nondestructive examination and general and specific inspection knowledge. Record whether each weakness is a method, a concept or locating a reference.

For the exam itself, the API 510 exam guide covers the format, sections and windows on one page. The Body of Knowledge guide explains that structure, and the effectivity-sheet guide helps match editions to your window. Use those reference identifiers with your own licensed publications.

Start with the free 10-question check

The free 10-question check takes a few minutes, needs no signup and tells you which Body of Knowledge domains to study first. The Long Seam course turns that result into a study plan built from your exam date, with a lesson for each domain and timed practice exams.

If your experience is on piping, the free API 570 practice test gives you 10 original questions on piping inspection and calculations, explained as you answer.

Already an API 510 inspector? The free API 510 recert check refreshes the rules and RP 571 sections the six-year recertification quiz can reach.

FAQ

What experience do you need for API 510?

It depends on your education. An engineering or technology bachelor's degree needs one year performing or supervising API 510 inspection activities, and a high-school diploma needs three years of relevant vessel work, including one year performing or supervising inspection.

Can you get API 510 certified without a degree?

Yes. A high-school diploma or equivalent needs three years of relevant vessel work, and no formal education needs five or more years, each including one year performing or supervising inspection. Experience must fall within the previous ten years.

How much does the API 510 exam cost?

API's fee page lists $890 for members and $1,140 for non-members under its 2027 Fees tab, and $875 and $1,125 under its 2026 Fees tab. Budget separately for references, preparation and travel.

How long is an API 510 application valid?

Six months from the first exam date requested, and the period does not restart with each attempt. Certification also waits until application deficiencies are cleared, even after a passing result.

Sources

Show the list

• API 510 Pressure Vessel Inspector: Qualification, American Petroleum Institute
• ICP Schedules & Fees, American Petroleum Institute
• ICP Policies: Applications & Exams, American Petroleum Institute
• API 510 Body of Knowledge, September 2026 to May 2027, American Petroleum Institute