API 571 Corrosion and MaterialsExam Guide & Preparation

API 510, 570, and 653 each certify inspection competency for a specific equipment category: pressure vessels, piping systems, and aboveground storage tanks respectively. Each of those exams tests inspection codes, repair rules, and equipment-specific practice for that asset type.

API 571 sits underneath all three. Instead of asking how to inspect a pressure vessel or a tank, it asks why any of that equipment degrades in the first place, covering the full range of damage mechanisms that show up across vessels, piping, and tanks alike. This is why it pairs so naturally with the other three: an API 510-certified inspector who also holds 571 can diagnose why a vessel is corroding, not just confirm that it is, which materially changes how a fitness-for-service assessment gets written. Holding a current API 510, 570, or 653 certification automatically qualifies you to sit for API 571.

API 571 is administered through Prometric testing centers and registered directly through API's own certification portal, not through EIM or any third-party training provider. You'll need to submit your eligibility documentation, either your active API 510/570/653 certification number, or your education and experience records for the combination route, as part of registration.

API's 2026 fee schedule lists the official exam fee within the same ICP structure used across API's inspector certifications. This official fee covers only your Prometric exam seat; it does not include EIM's study material, question bank, or structured exam preparation. Once approved, you can book a seat at any Prometric center offering the exam, subject to seat availability in your region.

API 571 sits at the center of asset integrity work because damage mechanisms are the root cause behind nearly every inspection finding, repair decision, and fitness-for-service assessment in refining and petrochemical operations. Understanding how and why equipment degrades, not just how to inspect it, is what separates a certified API 571 professional from a general inspector.

Because the exam leans heavily on scenario recognition rather than rote memorization, effective API 571 exam preparation means working through realistic damage mechanism situations repeatedly, which is why EIM's large, BOK-mapped question bank tends to outperform passive reading of the reference document alone. Every question in the API 571 question bank includes a worked explanation, so an incorrect answer becomes a diagnostic tool for where your understanding of a specific mechanism has a gap.