Fundamentals of Mechanical Integrity & Damage Mechanisms for Inspectors

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Section 1 — Mechanical Integrity Foundations

Lesson 1: Introduction to Mechanical Integrity What MI is and why it matters. The systematic program for keeping process equipment fit for continued safe service. Coverage of pressure vessels, piping, and aboveground storage tanks. Owner-operator responsibilities vs. inspector responsibilities. References: API 510, API 572, federal process safety regulations

Lesson 2: Regulatory Framework & Inspection Codes The federal regulatory framework (29 CFR 1910.119). Industry codes that govern inspection: API 510 for pressure vessels, API 570 for piping, API 653 for storage tanks. ASME pressure equipment context. How codes interconnect. References: API 510, API 572, API 653

Section 2 — Damage Mechanisms Overview

Lesson 3: Introduction to Damage Mechanisms What damage mechanisms are and how they manifest in fixed equipment. The relationship between operating conditions, materials, and damage. Why API 571 is the master reference. Identifying damage from observable symptoms. References: API 571

Lesson 4: API 571 Damage Mechanism Categories The major categories of damage mechanisms: corrosion-related, environmental cracking, high-temperature, mechanical, and material/fabrication-related. How API 571 organizes them. Choosing the right inspection technique for each category. References: API 571

Section 3 — Corrosion Damage Mechanisms

Lesson 5: General and Localized Corrosion General (uniform) corrosion vs. localized corrosion. Pitting, crevice corrosion, galvanic corrosion. How to detect and measure each. Common locations in refinery equipment. References: API 571

Lesson 6: Corrosion Under Insulation (CUI) The most expensive damage mechanism in petrochemical plants. Mechanism and conditions for CUI. Inspection strategies. Insulation removal and screening techniques per API 583. References: API 571, API 583

Section 4 — Environmental Cracking

Lesson 7: Stress Corrosion Cracking SCC mechanisms — chloride SCC, caustic SCC, polythionic acid SCC, amine SCC. Materials susceptibility. Detection methods. High-risk equipment in refineries. References: API 571

Lesson 8: Hydrogen Damage Mechanisms Hydrogen-induced cracking (HIC), stress-oriented HIC (SOHIC), hydrogen blistering. Wet H2S service. Material selection and inspection methods. References: API 571

Section 5 — High Temperature Damage

Lesson 9: High Temperature Hydrogen Attack (HTHA) HTHA mechanism and Nelson curves. Susceptible alloys. Detection challenges and methods. Real-world failure case studies. References: API 571, API 941

Lesson 10: Creep and High Temperature Corrosion Creep at elevated temperatures. Sulfidation, naphthenic acid corrosion, oxidation. Affected equipment in refineries (heaters, FCC units). References: API 571

Section 6 — Mechanical Damage

Lesson 11: Fatigue and Brittle Fracture Mechanical and thermal fatigue cycles. Crack initiation and propagation. Brittle fracture mechanism and DBTT (ductile-to-brittle transition temperature). Inspection of fatigue-sensitive locations. References: API 571

Lesson 12: Erosion and Mechanical Damage Erosion-corrosion, cavitation, mechanical wear. Common locations: pipe elbows, control valves, FCC slurry lines. Inspection and mitigation. References: API 571

Section 7 — Inspection Strategies

Lesson 13: Risk Based Inspection (RBI) RBI principles and methodology per API 580/581. Probability of failure and consequence of failure. Risk matrix development. Implementing RBI in plant inspection programs. References: API 580, API 581

Lesson 14: Inspection Planning and TML Management Inspection plan development. Thickness Measurement Location (TML) selection and management. Corrosion rate calculation. Setting and adjusting inspection intervals. References: API 510, API 570, API 653

Section 8 — Fitness for Service and Remaining Life

Lesson 15: Fitness for Service Assessment FFS overview per API 579. When FFS is required. Level 1, 2, 3 assessment progression. Common scenarios: localized metal loss, weld misalignment, pitting damage. References: API 579

Lesson 16: Remaining Life and Course Summary Calculating remaining life from corrosion rates. Establishing next inspection dates. Course summary tying together all 15 prior lessons. Preparing the inspector for real-world application. References: API 510, API 579