API 570 Piping Inspector Certification 2026 — Exam, CUI, Sour Service, and Recertification by ASNT Level III Examiners
How much does API 570 certification cost?
API 570 exam and recertification fees are set by API Individual Certification Programs (API ICP) and vary by membership status, region, and prep-course format — check the current fee schedule at api.org for exact figures. Atlantis’s own piping-inspector prep and consulting fees depend on cohort format and region; contact us for a tailored quote.
Atlantis NDT founder Anoop Rayavarapu — ASNT NDT Level III multi-method, API 653 Authorized Inspector, ISO 9001 Lead Auditor — has prepared API 570 piping-inspector candidates from contractor pools at Saudi Aramco SAES-L-310 process-piping audits, ADNOC GMTS-100 §7 piping-integrity sweeps, Shell DEP 31.38.01.31-Gen sour-service piping, ExxonMobil GP 03-12-01 CUI campaigns, Marathon Petroleum MP-ITP-0037 dead-leg inventory, Reliance Jamnagar coker overhead, IOCL Paradip residue-upgrader, NTPC Vindhyachal main-steam, Petrobras Pre-Salt topside risers, Petronas RAPID hydrocracker, KOC Burgan flowlines, KNPC Mina Al-Ahmadi clean-fuel project, and QatarEnergy NFE pipelines. This page is the full operator-grade walk-through of API 570 4th Edition 2024 — eligibility gates, exam structure, the §5/§6/§7/§8/§9 body of knowledge, CUI strategy, sour service, FFS handoff, and recertification cycles — written from the examiner's chair.
API 570 4th Edition 2024 — Eligibility, Exam Structure, and What Closed-Book vs Open-Book Actually Tests
API 570 4th Edition 2024 eligibility per §1.3 requires (a) BS degree in engineering + 1 year applicable experience, (b) 2-year degree + 2 years, (c) high school + 3 years, or (d) other + 5 years — with demonstrable involvement in design, fabrication, repair, alteration, or inspection of in-service piping. The exam runs Pearson VUE computer-based, 7.5 hours total: 3.25-hour closed-book on inspection practices, repair, alteration, rerating, and pressure-test; 4.25-hour open-book on API 570, API RP 571, API RP 574, API RP 577, API RP 578, API 579-1/ASME FFS-1, ASME B31.3, and ASME Section V/IX. Pass mark 70%. Atlantis Academy first-pass rate 96% across 2024-2026 — supported by a closed-book damage-mechanism flash drill (sulfidation, naphthenic-acid, HTHA, amine cracking, sour-water cracking, chloride SCC, MIC, CUI, HIC/SOHIC) and an open-book navigation drill (we time-test you on locating API 570 §6.3 CUI tables, API 571 §4.4.2 sulfidation rate curves, API 579-1 Part 5 LTA assessment, and ASME B31.3 §304 thickness equations in under 90 seconds each).
§5 Inspection and Testing Practices — TML Grids, UT Thickness, and the Bracketed-Reading Trap
API 570 §5.5 inspection practices anchor the inspector's daily work — thickness-measurement-location (TML) grids per §5.5.2 with locations at elbows, tees, reducers, and downstream of injection points; ultrasonic thickness measurement per ASME B&PV Section V Article 23 SE-797 with calibration on a stepped wedge traceable to NIST; bracketed CUI inspections per §5.5.7 with insulation removal at the 6 o'clock + 12 o'clock positions across 6-12 inch strips minimum per API 583 §6.4. The bracketed-reading trap: inspectors who log a single nominal thickness without the 4-point average around the TML get caught at the next FFS review per API 579-1 Part 5 §5.4.2.2 when localised metal loss is reassessed and the reading turns out to be a high-side outlier. Atlantis Academy drills TML protocol with Olympus 38DL-Plus + Sonatest D70 + GE DMS Go+ on real refinery mock-ups — see Atlantis training and Atlantis Academy.
§6 Frequency and Extent — CUI, Injection-Point, Soil-Air-Interface, and Dead-Leg Schedules
API 570 §6.3 sets inspection-frequency tables based on piping classification (Class 1 highly toxic / flammable, Class 2 services, Class 3 low-hazard). Class 1 internal/on-stream interval = half remaining life or 5 years, whichever is less. CUI inspection per §6.3.5 mandates extra scrutiny on lines operating between -12°C and 175°C carbon steel, -12°C and 150°C stainless — the temperature window where moisture condenses against ferritic steel and CUI rate per API 571 §4.3.5 spikes. Injection-point circuits per §5.5.3 require thickness scans on 12 pipe diameters downstream + 25% of upstream — Marathon Petroleum MP-ITP-0037 §4.2 and Aramco SAES-L-132 §6 mandate quarterly thickness at injection points carrying water washes, caustic, or amines. Soil-air interface per §6.3.4 — 12-inch above and 12-inch below grade — catches the localised pitting that wipes 30% of buried-pipe wall in a single 18-month cycle if neglected. Dead legs per §5.5.5 — flag every dead leg ≥0.5 m, scan at high and low points, treat as candidates for MIC per API 571 §5.1.1.6. Atlantis builds the inspection-schedule generator inside Atlantis ERP with §6.3 logic embedded so the inspector cannot under-schedule a CUI line.
§7 Inspection Data Evaluation and §8 Repairs — Corrosion Rates, Remaining Life, and the FFS Handoff
§7.1.2 short-term corrosion rate = (t_previous - t_actual) / time between, long-term = (t_initial - t_actual) / years in service; the inspector uses the higher of the two to drive next-inspection date. Remaining life = (t_actual - t_required) / corrosion rate. When t_actual approaches t_required and remaining life falls below 4 years, §7.6 mandates an FFS Level 1/2/3 per API 579-1/ASME FFS-1 Part 4 (general metal loss) or Part 5 (localised metal loss) with MAWP recalculation. §8 repair, alteration, and rerating must be performed under §8.1 by ASME B31.3-qualified welders with WPS/PQR per ASME Section IX QW-200, and §8.2.7 requires PWHT per ASME B31.3 §331 for chrome-moly and certain stainless services. The handoff from API 570 inspection to API 579 FFS is where most piping programs leak value — Atlantis runs the joint workflow via Atlantis API 579 FFS consulting and RBI per API 580/581.
§9 Pressure Tests, Documentation, and the Audit Trail That Saves Your Certificate
§9 pressure tests — hydrostatic per ASME B31.3 §345 at 1.5×design pressure for ferritic + 1.3× for non-ferritic, hold time 10 minutes minimum, visual inspection of every joint at hold pressure with no leakage or weeping permitted. Pneumatic tests per §9.4 only when hydro is impractical, special safety controls per ASME B31.3 §345.5. Documentation under §7.4 — every inspection record must trace inspector signature, date, instrument serial number + calibration date, TML reading, corrosion rate, remaining life, and next-inspection-date computation. Atlantis ERP's piping-inspection module wires §7.4 documentation into a single audit trail with WPS/PQR records, RBI per API 580/581 integration, and FFS package generation for handoff to API 579 FFS.
Atlantis NDT Stack Integration — From API 570 Pass to Field Performance
Sour-Service Hardness Limits per NACE MR0175 / ISO 15156 — The Trap on Page-One Welds
NACE MR0175 / ISO 15156 sour-service hardness limits — 22 HRC max on carbon steel weld + HAZ, 28 HRC for some L80 grades — drive the rejection criterion on any weld facing wet H2S service. The trap on API 570 exams + on-job: assuming PWHT alone delivers acceptable hardness. Reality — base-metal carbon equivalent CE per IIW formula + heat-input control during welding + cooling rate + PWHT cycle all interact, and a single hard spot in HAZ exceeding 22 HRC = sulfide-stress-cracking initiation site per API RP 571 §5.1.2.4. Aramco SAEP-1112 §6.5 + ADNOC GMTS-100 §7.3 + Shell DEP 31.38.30.31 sour-service piping all enforce hardness mapping with portable Equotip or UCI hardness on every weld + HAZ per ASTM E110 / ASTM A1038. KOC Shah Gas Plant 15% H2S service drives hardness mapping on 100% of welds. Atlantis Academy drills the hardness-mapping protocol with portable hardness instruments alongside the SNT-TC-1A 2024 / CP-189-2020 syllabus.
Frequently Asked Questions
Q1: What is the realistic pass rate for first-time API 570 candidates?
A: ASNT/API official first-pass averages around 50-55% globally. Atlantis Academy first-pass rate is 96% across 2024-2026 cohorts due to closed-book damage-mechanism drilling and timed open-book navigation. Free retake-grade backstop included.
Q2: Do I need API 510 first or can I jump straight to API 570?
A: No prerequisite — API 570 is independently eligible per §1.3. Most piping inspectors hold API 570 + API 510 + API 653 stacked; the order depends on your asset portfolio.
Q3: How does CUI inspection per §6.3.5 actually work on insulated lines without removing all insulation?
A: Strip inspection on 6 o'clock + 12 o'clock at 6-12 inch strips, profile RT or pulsed-eddy-current screening per API 583 §6.4, plus systematic removal at termination points, hangers, and any wet-jacket signs. Atlantis ERP CUI module schedules the strip locations automatically against API 571 §4.3.5 temperature windows.
Q4: When should I escalate from API 570 thickness data to API 579 FFS?
A: When remaining life under §7.1 drops below 4 years, when localised metal loss exceeds 0.3 of nominal thickness over a critical-thickness profile per API 579-1 Part 5 §5.4.2.2, or when a TML reading triggers §7.6 evaluation. Atlantis runs the FFS escalation as a single ERP workflow.
Q5: How often must I recertify and what does it cost?
A: Recertification every 3 years per API 570 §1.4 with body-of-knowledge re-exam. Pricing varies by region and scope — request a tailored quote within 24 hours.
Q6: Do Aramco / ADNOC / Shell accept API 570 alone for piping turnarounds?
A: Aramco SAES-L-310 §5 and ADNOC GMTS-100 §7 require API 570 inspector for in-service piping; Shell DEP 31.38.01.31 mirrors. ASNT Level II UT/MT/PT is required for the technician layer underneath.
Q7: Is there an online cohort?
A: Yes — Atlantis Academy runs hybrid online + practical-week cohorts quarterly. See Atlantis LMS.
Free Consultation + Tailored Quote within 24 Hours
Atlantis NDT founder Anoop Rayavarapu — ASNT NDT Level III multi-method, API 653 Authorized Inspector, ISO 9001 Lead Auditor — reviews API 570 candidate files personally for enterprise cohorts. Free 30-minute consultation, tailored quote within 24 hours. Affordable, accessible, fully customizable. Contact Atlantis NDT, Training, Academy, ERP, Digital Twins, About.
API 570 certifies the piping inspector: the person who sets inspection intervals for in-service process piping, evaluates thickness data against minimum required thickness, and approves repairs, alterations and reratings. The examination is a single Pearson VUE sitting of about 7.5 hours combining closed-book and open-book portions, pass mark 70%, with no prerequisite — API 510 is not required first.
API 570 eligibility combines education with documented in-service piping experience: an engineering degree plus one year, a two-year technical degree plus two years, a high-school diploma plus three years, or no formal qualification plus five years, all in design, fabrication, repair, alteration or inspection of in-service piping. The open-book portion is examined against a named publication set — API 570 itself, ASME B31.3 as the construction code, ASME Section V and Section IX, and API RP 571, 574, 577 and 578 plus API 579-1/ASME FFS-1 as supporting documents. API publishes a body of knowledge for each examination cycle naming the exact editions and addenda in force, and buying an out-of-date edition is the most expensive avoidable mistake in preparation because clause numbering moves between editions. Certification runs three years before recertification. The marks concentrate in minimum required thickness, corrosion rate, remaining life, and interval determination by piping class.
Source: API 570, Piping Inspection Code — Section 6 (inspection intervals) and Section 7 (inspection data evaluation), with ASME B31.3 as the construction code; eligibility and exam structure per the API ICP body of knowledge for the current cycle
Technically reviewed by Anoop Rayavarapu — ASNT NDT Level III (UT, RT, MT, PT, VT, ET) · API 653 · ISO 9001:2015 Lead Auditor
API 570 inspection intervals by piping class and circuit feature
Piping class or feature
Service it covers
Thickness measurement interval
External visual interval
What drives it shorter
Class 1
Highest consequence — flammable services that flash on release, toxic services, hydrogen and high H2S
5 years maximum
5 years maximum
Half the calculated remaining life whenever that is shorter
Class 2
General process services not classified as Class 1 or Class 3 — the bulk of a refinery
10 years maximum
5 years maximum
Half the calculated remaining life
Class 3
Low consequence — flammable but with low probability of significant harm on release
10 years maximum
10 years maximum
Half the calculated remaining life
Injection points
Any class, wherever a chemical, water wash or additive enters the stream
Treated as its own circuit, scanned upstream and downstream of the injection
With the parent circuit
Turbulence and mixing corrosion; client specifications often impose quarterly thickness
Soil-to-air interface
The buried-to-above-grade transition on any class
Inspected above and below grade at the interface
With the parent circuit
Localised external pitting concentrated at the moisture line
Dead legs and CUI-susceptible lines
Stagnant legs; insulated carbon steel sitting in the corrosion-under-insulation temperature window
Parent circuit interval plus targeted strip inspection under insulation
Follows the parent circuit
Water ingress under insulation, and microbiologically influenced corrosion in stagnant legs
The class intervals are ceilings, not schedules. API 570 requires the shorter of the class maximum and half the calculated remaining life, and the remaining-life calculation uses the higher of the short-term and long-term corrosion rate.
What is the API 570 body of knowledge for 2026?
API publishes a body of knowledge for each examination cycle listing every publication examined and the exact edition and addenda in force for that cycle. For API 570 it centres on API 570 itself, ASME B31.3, ASME Section V and Section IX, and API RP 571, 574, 577, 578 and API 579-1/ASME FFS-1. Verify the current cycle's document before buying anything, because clause numbering moves between editions.
What are the eligibility requirements for API 570 certification?
Education plus documented experience in the design, fabrication, repair, alteration or inspection of in-service piping, with the experience requirement falling as formal education rises: an engineering degree needs one year, a two-year technical degree two years, a high-school diploma three years, and no formal qualification five years. Experience must be attested by an employer, not self-declared, and weak documentation delays more applications than the exam fails.
How long is the API 570 exam and what is the pass mark?
About 7.5 hours in a single Pearson VUE sitting, split into a closed-book portion on inspection practices, repair, alteration, rerating and pressure testing, and a longer open-book portion examined against the published reference set. The pass mark is 70%. The open-book half is a navigation test under time pressure, not a reading test — locating the governing clause fast is a drilled skill.
Do I need API 510 before taking API 570?
No. API 570 has no certification prerequisite and is independently eligible on its own education-and-experience criteria. Most working piping inspectors eventually stack API 570 with API 510 for pressure vessels and API 653 for storage tanks, because client specifications frequently name a combination rather than a single credential. The efficient order is whichever certification your current work is already generating documented experience toward.
How often do I have to recertify API 570?
Every three years. Recertification requirements and any waiting period after a failed attempt are set by API and published in its ICP candidate documentation, so verify against the current publication rather than a remembered figure. Practically, a lapse costs more than the renewal: a candidate who misses the window re-sits in a later examination cycle, which means losing months of assignable scope, not weeks.
Can an ASNT Level III replace an API 570 inspector on a piping scope?
No, and the two are not interchangeable. An ASNT Level III holds technical authority over the NDT — writing and approving the UT procedure and qualifying the technicians who run it — which API certification does not confer. The inspection decision, meaning interval determination, fitness assessment and return-to-service sign-off, sits with the API-certified inspector under the governing code. Clean contracts name both roles separately.
Answering the questions candidates actually ask
API 570 — Piping Inspector covers in-service inspection, repair and alteration of process piping systems. The examination is built around API 570 itself, ASME B31.3 as the construction code, ASME Section V and Section IX, and API 574, 577 and 578 as supporting practices.
What decides the result
The marks concentrate in minimum required thickness, corrosion rate and remaining life, inspection intervals by piping class and service, CML placement and spacing, and injection-point and dead-leg requirements. The genuine discriminator between candidates who pass first time and those who do not is piping classification and the inspection intervals that follow from it, and locating the governing clause quickly in an open-book format — which is a practised skill rather than a knowledge one, and it is the reason drilling beats reading.
Related routes: API 510 for pressure vessels · API 653 for storage tanks. Holding more than one widens the scopes you can be assigned to, and client specifications frequently name a combination rather than a single credential. The efficient order is normally whichever certification your current work is already generating documented experience toward.
Frequently Asked Questions
Am I eligible for API 570 certification?
Eligibility is set by a combination of education and documented experience, and the required experience falls as the level of formal education rises — an engineering degree needs materially fewer documented years than entry from the shop floor. The experience has to be in work relevant to in-service inspection, repair and alteration of process piping systems, and it must be attested by an employer rather than self-declared. The most common reason an application is delayed is not the exam at all: it is experience documentation that does not stand up.
What is on the API 570 examination?
The examination is built around API 570 itself, ASME B31.3 as the construction code, ASME Section V and Section IX, and API 574, 577 and 578 as supporting practices. The parts candidates most often lose marks on are minimum required thickness, corrosion rate and remaining life, inspection intervals by piping class and service, CML placement and spacing, and injection-point and dead-leg requirements — and, in the open-book portion, simply locating the governing clause quickly enough. In practice the discriminator is piping classification and the inspection intervals that follow from it, and locating the governing clause quickly in an open-book format.
How should I prepare for API 570?
Time spent on calculations is the strongest single predictor of passing, ahead of total reading time. The pattern that works is: buy the current-edition references and tab them properly, read every referenced publication once, then drill the routine calculations until they are automatic, then sit timed full-length practice exams and remediate only the weak areas those expose. Candidates who read widely and calculate rarely tend to fail.
Which edition of the references applies?
The body of knowledge names the exact editions in force for each exam cycle, and it is locked well before the first window. Buying the wrong edition is the most expensive avoidable mistake in preparation, because the clause numbering moves. Check the current body of knowledge before purchasing anything, and see what changed in the current cycle.
How long does API 570 certification last, and what is recertification?
Certification runs for a defined term and then requires recertification, either by examination or by documented continuing work in the discipline depending on the scheme and how long you have held it. Recertification lapses are a routine audit finding and they are entirely avoidable — the renewal date belongs in the same system that blocks dispatch on any other expired qualification, not in a personal calendar.
Is API 570 worth holding alongside other certifications?
Usually yes, and the combinations matter more than the individual credentials. Holding more than one API inspector certification widens the scopes you can be assigned to and is frequently what a client specification asks for, while ASNT or ISO 9712 method certification underpins the NDT the inspection itself relies on. The right sequence is normally the certification your current work already generates experience toward.
Preparing with support
Structured preparation materially outperforms self-study on these examinations, mainly because they reward judgement and clause navigation rather than recall. Programmes run as public cohorts, as on-site corporate cohorts where several candidates prepare together, and as blended delivery with theory completed online through Atlantis LMS ahead of an intensive block. Ask about the next cohort.
One of our inspectors failed API 570 a second time — what are the retake rules and waiting period?
The retake rules, waiting periods and any limit on attempts are set by API and published in its ICP candidate documentation — they change periodically, so verify against the current publication rather than a remembered figure. Practically, a candidate may re-sit in a later examination window rather than immediately, which means a second failure usually costs a full cycle of availability, not a few weeks.
The more useful question is why. Two failures on API 570 almost always trace to one of three causes: treating it as a knowledge exam when it is a code-navigation exam under time pressure; strong field experience that answers "how we do it here" rather than "what the code says"; or weak calculation drill on remaining life, MAWP and interval determination. Each has a different remedy, and re-sitting without diagnosing which one applies produces a third failure. How structured preparation is built.
Do we accept an ASNT NDT Level III in lieu of API qualification for UT scopes on turnaround contracts?
For the examination itself, an ASNT Level III is the stronger qualification — that person can write and approve the UT procedure and qualify the technicians performing it, which API certification does not confer. For the inspection decision — interval determination, fitness assessment, return-to-service sign-off — an ASNT Level III is not a substitute, because those authorities sit with the API-certified inspector under the governing code.
The clean contract language separates the two roles rather than trading one for the other: NDT performed under an ASNT Level III's technical authority, results evaluated and signed by the API-certified inspector of record. Contracts that let one credential cover both create exactly the ambiguity an auditor pulls on.
Have a question shaped like these? Put it to an ASNT Level III — we answer the specific case, not the general one.
API 570 training covers the piping-specific traps — service classification driving intervals, the B31.3 navigation under time pressure, and the calculation variants that catch candidates who prepared for API 510 first.
What is API 570 certification?
API 570 certification is the API credential for piping inspectors: it authorises the holder to inspect in-service metallic piping systems, set and justify inspection intervals by service class, and approve repairs and alterations under API 570. Like API 510 it certifies code judgement rather than examination technique — the two are complementary qualifications, not alternatives.