API 510, 570 & 653 Exam Schedule 2026: Windows, Deadlines & Dates

Every 2026 API ICP exam window, application deadline, Body of Knowledge (BoK) edition, and result-release date for API 510 (Pressure Vessel Inspector), API 570 (Piping Inspector), and API 653 (Tank Inspector) in one table. Paper-based testing (PBT) runs in three fixed 3-week windows; computer-based testing (CBT) is offered year-round at Prometric centers. Always verify final dates at api.org before locking in your prep schedule.

2026 API ICP Exam Schedule (All Three Certifications)

API 510, API 570, and API 653 share the same 2026 calendar:

Quick read: three PBT windows — May 5–23, August 4–22, and November 3–21, 2026. Applications close 6–8 weeks before each window; results arrive roughly 8 weeks after it closes. CBT is the fastest path if you have already missed a PBT deadline. See the official API ICP pages for current application and exam fees.

PBT vs CBT: How the API Exam Windows Work

• Paper-Based Testing (PBT): three fixed windows per year; hard-copy reference standards with personal tabs and highlighting allowed; pass rates around 45–55%; preferred by veterans who study with marked-up code books.
• Computer-Based Testing (CBT): rolling year-round at Prometric; seats typically bookable within 2–6 weeks; electronic (unmarked) standards; pass rates around 40–50%; best for flexibility or a missed PBT deadline.

Both deliveries award the identical ICP certificate from the same question bank and Body of Knowledge.

Application Deadline Math: How Far Ahead to Plan

• Application window opens ~14 weeks before the exam window starts
• Application window closes 6–8 weeks before the exam window starts
• API review and approval takes 2–4 weeks after submission
• Authorization to Test (ATT) issued 4–6 weeks before the exam
• Recommended submission buffer: 10–12 weeks before the window

Worked example — August 2026: exam Aug 4–22 → application closes ~Jun 17 → submit by ~May 27 for safety → start gathering employer attestation by mid-April. Late applications are never accepted; a missed deadline means the next window (3–4 months) or a CBT pivot.

Which Body of Knowledge Edition Applies in 2026?

All three 2026 windows (May, August, November) use the 2026 BoK, locked roughly six months before the first window. Standards in force:

• API 510: 11th Edition + 2026 Addenda, with ASME Section V, VIII Div. 1, and B31.3
• API 570: 5th Edition + 2026 Addenda, with ASME B31.3 and API 574/577/578
• API 653: 6th Edition + 2026 Addenda, with API 650 and API 579-1/ASME FFS-1
• Common references: ASME Section V (NDE) and Section IX (Welding Qualifications)

Buying the wrong edition is the most expensive avoidable prep mistake — read our API 510 BoK 2026 changes breakdown before purchasing standards.

Registration: APIcheck + Prometric in 7 Steps

1. Create an APIcheck account at my.api.org/icp (verification takes 1–2 business days)
2. Complete the experience attestation, signed by your employer
3. Upload resume, education documents, and government-issued photo ID
4. Pay the application and exam fees (see api.org for current fee amounts)
5. Wait 2–4 weeks for API approval and your Authorization to Test (ATT)
6. CBT only: schedule a seat at prometric.com/api; PBT seats are auto-assigned for your window
7. On exam day bring your ATT, matching photo ID, and (PBT only) tabbed reference standards

What to Do If You Miss a 2026 Window

• Switch to CBT: Prometric seats are usually available within 2–6 weeks with the same question pool and BoK
• Defer to the next PBT window: May → August → November; fee transfers can be requested via APIcheck within 30 days
• Use the gap for deeper prep: candidates with 400+ study hours reach 80%+ pass rates versus ~25% at 100–150 hours
• Stack a second certification: triple-crown holders (510+570+653) earn $130K–$180K versus $105K–$140K for single-cert inspectors — see our API 653 certification guide for the tank track

Recommended 26-Week Prep Timeline

Countdowns: August 4–22 window → start by Feb 2, 2026. November 3–21 → start by May 4, 2026. May 2027 → start by Nov 2, 2026. Compare difficulty across the three exams in our API ICP pass-rate comparison.

Frequently Asked Questions

When is the next API 510 exam in 2026?

The remaining 2026 PBT windows are August 4–22 (apply by June 17) and November 3–21 (apply by September 16); the Q2 window ran May 5–23. CBT seats at Prometric are available year-round, usually within 2–6 weeks. Verify final dates at api.org.

What is the API 570 exam schedule for 2026?

API 570 follows the same three 2026 PBT windows: May 5–23, August 4–22, and November 3–21, with applications closing roughly March 18, June 17, and September 16 respectively. Results arrive about 8–10 weeks after each window closes. CBT delivery is also available year-round.

When is the API 653 exam window in 2026?

API 653 uses the standard API ICP calendar: May 5–23, August 4–22, and November 3–21, 2026. Application windows open ~14 weeks before each exam and close 6–8 weeks before. Most tank-inspector candidates choose PBT for the tabbed hard-copy standards advantage.

What are the application deadlines for 2026 API exams?

Approximately March 18, 2026 for the May window, June 17, 2026 for August, and September 16, 2026 for November. Applications require experience documentation, employer attestation, and ID. Late applications are not accepted — API recommends submitting at least 10 weeks before the window opens.

How much do the API exams cost in 2026?

API sets separate application, examination, retake, and recertification fees that change periodically — see the official API ICP pages (api.org) for current fee amounts. Prep-course pricing varies by region and scope; request a tailored quote for Atlantis NDT cohort training.

What happens if I miss an API exam window?

There are no late registrations or makeups. Your options: switch to CBT (seats within 2–6 weeks), apply early for the next PBT window 3–4 months later, or use the gap to extend prep — the strongest predictor of passing is total study hours.

How early should I start studying for the November 2026 window?

Start by May 4, 2026 for a full 26-week runway, matching the 300–400 study hours successful candidates invest. Experienced vessel, piping, or tank inspectors can compress to 12–16 weeks. Structured cohorts with weekly live sessions materially raise pass rates — Atlantis prep students see 96% first-attempt success.

Atlantis NDT Products & Services

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