API 510, 570 and 653 vs AMPP CIP: which certification fits coating inspection work?
Teams that handle both coatings and corrosion often have to decide which certification to sponsor: one of API's inspector certifications, or AMPP's Coating Inspector Program, formerly NACE CIP. They are not two routes to the same job. Here is what each one certifies, who can sit it, and how the exams and renewals compare, taken from API's and AMPP's own program documents.
The short answer: they certify different work. API 510, 570 and 653 certify in-service inspection of pressure vessels, process piping and aboveground storage tanks to API's inspection codes: the maintenance, inspection, repair and alteration of the equipment itself. AMPP CIP certifies coating inspection: surface preparation, ambient conditions, film thickness, holiday testing and the reports around them. For coating inspection work, CIP is the certification that matches, or FROSIO where a specification asks for it. An API certification suits people who also inspect that equipment's integrity, and it is their experience with the equipment that qualifies them to sit it.
What each one certifies
| Certification | What it certifies | Coatings in the exam's body of knowledge |
|---|---|---|
| API 510 Pressure Vessel Inspector | Maintenance, inspection, repair and alteration of pressure vessels in service | None listed: no coating topic, and no coating standard among the exam publications |
| API 570 Piping Inspector | Maintenance, inspection, alteration and repair of in-service metallic piping systems | None listed: no coating topic, and no coating standard among the exam publications |
| API 653 Aboveground Storage Tank Inspector | Inspection, repair, alteration and reconstruction of aboveground storage tanks | One reference of ten: API RP 652, on linings for tank bottoms |
| AMPP CIP Level 1, Basic Coatings Inspector | Basic non-destructive inspection of liquid coatings applied to steel by brush, roller or spray, under the supervision of a Level 2 or 3 inspector in a shop, or a Level 3 in the field | All of it |
| AMPP CIP Level 2, Certified Coatings Inspector | Performing and documenting inspections of liquid and non-liquid coatings on a range of substrates, including concrete, with less supervision | All of it |
The API 510 and 570 exams do test corrosion: both include sections of API RP 571 on damage mechanisms such as atmospheric corrosion and corrosion under insulation. That is the inspector judging the metal, not the coating. Of the three, API 653 goes furthest into coatings. Its body of knowledge expects a practical understanding of RP 652: the types of tank-bottom lining and their pros and cons, when to recommend one, why linings fail, lining materials, surface preparation requirements, and what affects application. That is one reference of the ten the exam is drawn from.
Who can sit each one
API 510, 570 and 653 share one eligibility table. Only the equipment changes:
| Education | Experience needed | What counts |
|---|---|---|
| Bachelor's degree or higher in engineering or technology, or 3+ years of technical military service | 1 year | Supervising or performing inspection activities as the code describes them |
| 2-year degree or certificate in engineering or technology, or 2 years of technical military service | 2 years | Design, fabrication or construction, repair, operation or inspection of that equipment, with at least 1 year supervising or performing inspection as the code describes it |
| High school diploma or equivalent | 3 years | |
| No formal education | 5 or more years |
The experience has to be from the last 10 years, gained while employed by, or under contract with, an authorized inspection agency as the code defines it, and API verifies it after you apply. For a coating team, that is the deciding rule: API counts experience with the vessels, piping or tanks, and the inspection year must be the inspection the code describes. Years spent inspecting paint jobs are a different kind of experience.
AMPP CIP Level 1 has no prerequisites and no experience requirement. Level 2 needs an active Level 1 certification and at least two years of verifiable coatings-related work experience.
The exams compared
| API 510, 570, 653 | AMPP CIP Level 1 | |
|---|---|---|
| Training | No course required; eligibility rests on education and documented experience | The CIP Level 1 course is required |
| Theory exam | 170 multiple-choice questions, 140 scored: 110 closed-book, then 60 open-book with the codes on screen as PDFs | 120 multiple-choice questions, 100 scored |
| Time | 6.5 hours of exam time on a 7.5-hour day: a tutorial, 2.75 hours closed-book, a 45-minute lunch, 3.75 hours open-book | 170 minutes; 3 hours of seat time with the tutorial |
| Where | Prometric test centres, in person only | Pearson VUE test centres |
| When | Three windows a year per exam, about three weeks each; applications close about two months before a window | Booked after the course; the exam authorisation is valid for a year |
| Practical exam | None | 8 instrument stations on the last day of the course |
The CIP Level 1 path, step by step, is in how to get NACE (now AMPP) CIP Level 1.
Renewal: both schemes check that you still do the work
- API 510, 570 and 653 renew every three years. The inspector must show that at least 20 % of their time over those three years went on performing or supervising that equipment's inspection, or sit the full exam again. They also need 24 hours of continuing professional development per cycle, and an online, open-book quiz every six years. Applications open 90 days before expiry, with a 90-day grace period and late fees after it.
- AMPP CIP renews every three years too. Level 1 asks for 1.5 years of coating-inspection work in the cycle; Level 2 for 18 months of coatings-related work and 24 professional development hours. Ethics training is a one-time requirement. The renewal guide has the details.
The practical upshot: a certification held by someone who does not do that work is hard to keep.
Other API certifications that touch coatings
- API SIFE, Source Inspector Fixed Equipment, covers quality surveillance at suppliers' shops: vessels, columns, heat exchangers, piping, valves, pressure-relief devices, tubulars and structural fabrications. Its reference list includes SSPC-PA 2 and the SSPC surface preparation standards (SP 1, SP 3, SP 5, SP 6, SP 7, SP 10 and SP 11). It is open to anyone with petroleum or petrochemical experience, and to people who want to gain it. The exam has 110 scored questions and 10 pretest questions in 3 hours 15 minutes, with no references, at a test centre or by remote proctoring.
- API 1169, Pipeline Construction Inspector, covers new onshore pipeline construction. Coating is one topic in it, alongside stringing, bending, welding, lowering-in and backfill. The exam is 115 questions in 3 hours.
- API 571, Corrosion and Materials, tests the damage mechanisms in API RP 571: knowledge of corrosion processes, not coating inspection. Holders of API 510, 570 or 653 qualify automatically; others qualify on education plus any petrochemical industry experience. The exam is 110 closed-book questions, 100 scored, in 3.25 hours.
Choosing for your team
- They inspect surface preparation and coating application, in new construction or maintenance painting: AMPP CIP Level 1, then Level 2 after two years of coating work. Where a specification names FROSIO instead, see FROSIO vs NACE (AMPP) CIP.
- They inspect in-service vessels, piping or tanks to the API codes: the API certification for that equipment, once their experience qualifies.
- They do both: both. CIP for the coating work and the API certification for the equipment, kept up by ongoing work in each field.
- They check fabricated equipment at suppliers' shops, coatings included: API SIFE is built for source inspection, and its references reach surface preparation and DFT. CIP goes much deeper into coating inspection itself.
- Corrosion engineers who want a damage-mechanism credential: API 571.
An offshore group splits the same way. API 510 and 570 certify integrity inspection of pressure vessels and piping; inspecting the coatings on the structure and its equipment is CIP or FROSIO work, depending on what the project's specification names.
CoatMentor prepares coating inspectors for the AMPP CIP Level 1 and Level 2 exams and the FROSIO written exam, with original questions, blueprint-weighted timed mocks and a worked explanation for every question. It does not cover the API exams. The free sampler shows the question style before anyone buys.
Try the free sampler See the CIP bundle →Sources
- API — API 510 Pressure Vessel Inspector, API 570 Piping Inspector and API 653 Aboveground Storage Tank Inspector — scope, exam structure, test centres, eligibility, recertification
- API 510 body of knowledge and publications effectivity sheet, September 2026 – May 2027 exams (PDF)
- API 570 body of knowledge and publications effectivity sheet, 2026 exams (PDF)
- API 653 body of knowledge and publications effectivity sheet, March – November 2026 exams (PDF) — the RP 652 lining topics
- API — ICP schedules and fees — exam windows and application deadlines
- API — SIFE Source Inspector Fixed Equipment and its body of knowledge (PDF); API 1169 body of knowledge (PDF); API 571 Corrosion and Materials
- AMPP — Exam Preparation Guides: Basic Coatings Inspector (CIP Level 1) and Certified Coatings Inspector (CIP Level 2) — scope of each level, exam format, prerequisites, renewal
- AMPP — Basic Coatings Inspector Certification (CIP Level 1) — no prerequisites, course, practical exam
Checked on 2 October 2026.
Related guides: How to get NACE (AMPP) CIP Level 1 · AMPP CIP Level 1 vs Level 2 · FROSIO vs NACE (AMPP) CIP · Renewing your AMPP CIP or FROSIO certificate.
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