Process Safety vs Occupational Safety

A: That’s the most common mistake — collapsing personal injury prevention into major accident prevention. The difference matters because API RP 754 Tier 1–2 events and IEC 61511 SIFs are tied to loss of containment and hazardous energy, not whether someone is wearing PPE when it happens. Handrails and gloves help after barriers fail; they don’t count as barriers against the failure itself.

A: That’s the usual confusion — focusing on what hurts people immediately instead of what breaks containment. The difference matters because liquid carryover is a credible initiating cause for compressor surge, seal failure, and rupture, turning a control failure into a high‑consequence event long before occupational hazards dominate.

A: That’s the trap — assuming SIL hardware alone guarantees risk reduction. The difference matters because LOPA credits independence, and a single PT feeding BPCS and ESD can fail once and blind both layers, leaving the hazardous inventory unmanaged regardless of how safe maintenance practices are.

A: That’s where people mix domains — thinking about exposure alarms instead of metal failure. The difference matters because wet H2S plus hardness above limits drives sulfide stress cracking, a classic process safety failure mode that can rupture equipment without warning.