API 653 Practice Test

The API 653 Practice Test is a free advanced-level, 25-minute skill test from Science of Apps. Practice for the API 653 Aboveground Storage Tank Inspector exam — inspection intervals and practices, tank shell and bottom evaluation with corrosion and remaining-life calculations, repair, alteration and reconstruction, welding and nondestructive examination, and damage mechanisms, cathodic protection and linings — written to API Std 653, API 650, API RP 575, RP 651, RP 652, API RP 571 and ASME Sections V and IX as listed in the API 653 body of knowledge for 2026. Score 70% or more on its 25 questions to earn a verifiable API 653 Readiness certificate (SOA-API6). Every question is based on published standards and research — including API 653 Aboveground Storage Tank Inspector certification and API Std 653 Tank Inspection, Repair, Alteration and Reconstruction (with API 650, RP 575, RP 651 and RP 652 in the body of knowledge) (American Petroleum Institute), ASME BPVC Section IX: Welding, Brazing and Fusing Qualifications (ASME), API RP 571: Damage Mechanisms Affecting Fixed Equipment in the Refining Industry (American Petroleum Institute) — and each answer is explained with its source.

Yes. Science of Apps has a free API 653 Practice Test built on the current API exam outline for 2026 and 2027. It covers inspection practices and intervals, shell and bottom evaluation, repair, alteration and reconstruction, welding and NDE and damage mechanisms, cathodic protection and linings, scores you instantly and issues a verifiable certificate.

Read the five skill areas on this page, then take the 25-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a API 653 Readiness certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: API 653 Aboveground Storage Tank Inspector certification and API Std 653 Tank Inspection, Repair, Alteration and Reconstruction (with API 650, RP 575, RP 651 and RP 652 in the body of knowledge) (American Petroleum Institute); ASME BPVC Section IX: Welding, Brazing and Fusing Qualifications (ASME); API RP 571: Damage Mechanisms Affecting Fixed Equipment in the Refining Industry (American Petroleum Institute). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Five skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Inspection Practices and Intervals (Routine, external and internal inspection, Inspector roles and Records); Shell and Bottom Evaluation (Corrosion rates, Shell minimum thickness and Bottom limits); Repair, Alteration and Reconstruction (Shell and bottom repairs, Hydrostatic testing and Reconstruction); Welding and NDE (WPS, PQR and welder qualification, NDE methods and Acceptance); Damage Mechanisms, Cathodic Protection and Linings (Corrosion mechanisms, Cathodic protection and Internal linings). Every question is an original scenario written to the 2026–2027 standard, with the published source named under it.

Aboveground storage tank inspector, Mechanical integrity engineer, Terminal or refinery inspection supervisor, NDE technician moving into tank inspection and Tank repair contractor QA/QC. It suits anyone who wants a quick, verifiable way to show API 653 knowledge in 2026 and 2027, from students and career switchers to experienced professionals.

API 653 is the American Petroleum Institute's certification for aboveground storage tank inspectors. It covers inspection, repair, alteration and reconstruction of welded steel tanks built to API 650 and similar standards, and uses a body of knowledge that includes API 650, RP 575, RP 651, RP 652, RP 571 and ASME Sections V and IX.

API 653 sets routine in-service inspections by owner/operator staff at least monthly, external inspections by an authorised inspector at least every 5 years (or sooner based on corrosion rate), and internal inspection intervals based on bottom corrosion rates, with maximum limits unless a risk-based assessment supports longer.

No. It is an independent practice test written to the publicly available API 653 content outline for 2026 and 2027, for checking your readiness before you book the real exam. Passing earns a Science of Apps certificate rather than the official credential.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

25 questions — 5 from each of 5 skill areas — with a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

We rate it Advanced: assumes years in the role or deep specialist knowledge. It has 25 scenario questions — 5 from each of 5 skill areas — and a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.