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API RP 571 – Damage Mechanisms Affecting Fixed Equipment in the Refining Industry

Assess whether your facility's inspection programme adequately identifies, monitors, and mitigates all major damage mechanisms per API RP 571 — covering mechanical and fatigue damage, metallurgical and high-temperature degradation, corrosion under insulation, acid and alkali corrosion, wet H₂S damage (HIC/SOHIC/SSC), high-temperature hydrogen attack (HTHA), stress corrosion cracking, sulfidation, oxidation, erosion, and organic coating failures. For each mechanism, assess awareness, identification protocol, inspection coverage, and mitigation measures.

API RP 571 (3rd Edition) 60+ Damage Mechanisms HTHA – Nelson Curves Wet H₂S (HIC / SOHIC / SSC) CUI – Corrosion Under Insulation Links to API 580/581 RBI Auto-Save Enabled
DM Category: Showing all API RP 571 damage mechanism categories.
Equipment Type: All equipment types shown.
Overall Progress
0%
✓ Adequate: 0 ~ Partial: 0 ✗ Gap: 0 — Not Applicable: 0 ○ Not Assessed: 0
📋 How to Use This Tool: For each damage mechanism listed, assess whether your facility has: (✓ Adequate) appropriate awareness, identification protocols, inspection coverage, and mitigation measures; (~ Partial) some coverage but gaps exist; (✗ Gap) insufficient coverage or mechanism not yet addressed in the inspection programme; (— N/A) the mechanism is genuinely not applicable to your facility's process conditions and materials. Use the Notes field to document specific findings, inspection methods used, or action items required.

⚙️ Facility & Inspection Programme Details

CATEGORY: MechanicalMetallurgical General CorrosionEnv. Cracking High TemperatureErosion RBI/Programme   All Equip. Vessels Piping HEX Fired Tanks

Damage Mechanisms Assessment Report

Inspection programme adequacy for all major API RP 571 damage mechanisms.

COMPANY
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ASSESSED BY
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DATE
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FACILITY / UNIT
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FACILITY TYPE
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TEMP RANGE
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H₂S/H₂ SERVICE
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RBI STATUS
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SCOPE
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📊 Category-by-Category Adequacy Rate
🔴 Gaps & Partial Coverage – Action Required
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ISO Xpert – Your API RP 571 Damage Mechanism Partner

Expert damage mechanism review workshops, RBI damage mechanism screening, inspection programme optimisation, HTHA Nelson curve assessments, wet H₂S damage programme development, and API RP 571 training. Headquartered in London, serving clients globally.

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🏢 About ISO Xpert

ISO Xpert supports refineries, petrochemical plants, and gas processing facilities in conducting API RP 571 damage mechanism reviews as part of RBI studies (API 580/581), inspection programme audits (API 510/570/653), and process safety management programmes. Our inspection engineers and materials specialists bring expertise across the full range of API RP 571 damage mechanisms from HTHA and wet H₂S to CUI, sulfidation, naphthenic acid corrosion, amine cracking, and high-temperature hydrogen attack.

API RP 571API 580/581 RBI API 510 / 570 / 653 HTHA Nelson Curve Assessment Wet H₂S Damage Programme CUI Inspection Programme Sulfidation / Naphthenic Acid SCC / CSCC Programme Damage Mechanism Workshops RBI Study Support API Q1 / ISO 9001 Training Courses

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ISO Xpert Ltd
71-75 Shelton Street, Covent Garden
London WC2H 9JQ, UK
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Privacy Policy

Last Updated: April 2025 | ISO Xpert Ltd

Assessment data is stored locally in your browser. Contact info@iso-xpert.com for UK GDPR requests.

Contact

ISO Xpert Ltd | 71-75 Shelton Street, London WC2H 9JQ | info@iso-xpert.com

Terms of Use

Last Updated: April 2025 | ISO Xpert Ltd

For legitimate internal damage mechanism programme assessment. Results are indicative only. API RP 571 is the property of the American Petroleum Institute (API). ISO Xpert Ltd is not affiliated with API. Governed by the laws of England and Wales.

Contact

ISO Xpert Ltd | 71-75 Shelton Street, London WC2H 9JQ | info@iso-xpert.com

Common Questions

API RP 571 Damage Mechanisms Affecting Fixed Equipment — Frequently Asked Questions

Authoritative answers about API RP 571 Damage Mechanisms Affecting Fixed Equipment, inspection intervals, qualifications, RBI, and ISO Xpert consulting.

What is API RP 571?
API RP 571 is the American Petroleum Institute Recommended Practice for Damage Mechanisms Affecting Fixed Equipment in the Refining Industry. It is a reference document that describes over 60 individual damage mechanisms that can affect pressure vessels, piping, heat exchangers, fired heaters, tanks, and other fixed equipment in refineries and petrochemical plants. It is used alongside API 580/581 (RBI) to identify and assess applicable damage mechanisms for inspection planning.
What are the categories of damage mechanisms in API RP 571?
API RP 571 organises damage mechanisms into six main categories: (1) Mechanical and Metallurgical Failure Mechanisms — including brittle fracture, fatigue, thermal fatigue, erosion; (2) Uniform or Localised Loss of Thickness — including CO2 corrosion, amine corrosion, naphthenic acid corrosion; (3) High-Temperature Corrosion — including sulfidation, oxidation, carburisation, metal dusting; (4) Environment-Assisted Cracking — including SCC, ASCC, CSCC, amine cracking, wet H2S damage (HIC/SOHIC/SSC); (5) Other Mechanisms — including HTHA, chloride SCC; and (6) Inorganic and Organic Protective Coatings.
What is HTHA and why is it critical in API RP 571?
High Temperature Hydrogen Attack (HTHA) is a damage mechanism occurring in carbon and low-alloy steels exposed to hydrogen at elevated temperatures and pressures. Atomic hydrogen reacts with carbides in the steel to form methane (CH4) bubbles that cannot diffuse out, causing internal cracking (fissuring) and decarburisation. HTHA can cause catastrophic brittle failure without visible external warning. Operating limits are defined by the Nelson Curves (API RP 941). HTHA is one of the most safety-critical damage mechanisms in refining service.
How does API RP 571 relate to API 580/581 RBI?
API RP 571 provides the damage mechanism knowledge base that feeds directly into API 580/581 Risk-Based Inspection. In an RBI analysis, the damage mechanisms applicable to each piece of equipment must be identified (using API RP 571 as the reference), the probability of failure from each mechanism assessed (using API 581 DF calculation methods), and the inspection programme designed to detect and measure each mechanism. Without API RP 571 knowledge, RBI analyses cannot identify all applicable damage mechanisms for each equipment item.
Can ISO Xpert help with API RP 571 damage mechanism reviews?
Yes. ISO Xpert provides API RP 571 damage mechanism review workshops, damage mechanism screening for RBI studies, damage mechanism awareness training, and integration with API 580/581 RBI programmes. Contact us at info@iso-xpert.com or call +44 7853 109840.

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