Expert-level chemical process safety covering HAZOP, LOPA, relief system design, consequence modeling, inherently safer design, and process safety management.
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HAZOP: hazard and operability study, guide words applied to design intent. Guide words: no, more, less, as well as, part of, reverse, other than. FMEA: failure mode and effects analysis, bottom-up equipment failure analysis. What-if: structured brainstorming, less systematic than HAZOP. Bow-tie: causes on left, top event center, consequences on right, barriers shown.
LOPA: layers of protection analysis, semi-quantitative risk assessment. Initiating event frequency: starting point for scenario frequency. Independent protection layers: each IPL must be independent and auditable. PFD: probability of failure on demand for each IPL. Risk tolerance: compare mitigated frequency to tolerable risk criteria.
Relief valve: spring-loaded, opens at set pressure, reclosed on pressure reduction. Rupture disk: one-time device, fails at rated burst pressure. Sizing: API 520 and 521 for pressure relief device sizing and selection. Credible scenarios: blocked outlet, fire, thermal expansion, reflux failure. Disposal: flare, scrubber, or containment for relief discharge.
PSM: OSHA 1910.119 for highly hazardous chemicals above threshold quantities. PHA: process hazard analysis required every 5 years. MOC: management of change, review all changes before implementation. Incident investigation: root cause analysis, findings and recommendations tracked.
| Pitfall | Fix |
|---|---|
| IPLs not truly independent | Verify each IPL has separate initiation and hardware |
| Missing fire case for relief sizing | Fire case often governs vessel relief requirement |
| Inadequate MOC for small changes | Even small changes can introduce new hazards |
| HAZOP action items not closed | Track all items with owner and due date to closure |
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Expert-level abstract algebra knowledge. Use when working with groups, rings, fields, modules, Galois theory, representation theory, or algebraic structures. Also use when the user mentions 'group', 'ring', 'field', 'homomorphism', 'isomorphism', 'normal subgroup', 'quotient group', 'Sylow theorem', 'Galois theory', 'polynomial ring', 'ideal', 'module', 'vector space', or 'representation theory'.
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Expert-level acoustics knowledge. Use when working with sound waves, acoustic propagation, resonance, standing waves, Doppler effect, room acoustics, ultrasound, noise control, musical acoustics, or architectural acoustics. Also use when the user mentions 'sound wave', 'decibel', 'frequency', 'resonance', 'standing wave', 'Doppler effect', 'acoustic impedance', 'reverberation', 'ultrasound', 'noise control', 'harmonics', or 'sound intensity'.
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Expert-level aerodynamics covering subsonic and supersonic flow, lift and drag, airfoil theory, boundary layers, compressible flow, and CFD methods.
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Expert-level air quality engineering covering pollutant sources, atmospheric dispersion, air quality standards, emission controls, and air quality modeling.
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Expert-level aircraft structures covering structural design philosophy, wing and fuselage analysis, fatigue and damage tolerance, composite structures, and certification.
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Expert-level algorithms and complexity theory covering sorting, searching, graph algorithms, dynamic programming, greedy algorithms, NP-completeness, and algorithm design paradigms.
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