Home Services Process Safety Management Systems OSHA Process Safety Management (29 CFR 1910.119)Process Safety Information (PSI)

OSHA Process Safety Management (29 CFR 1910.119)

Process Safety Information (PSI)

Chemistry, technology, and equipment information kept current and accessible

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Strategic context

What this element is — and why it matters

OSHA PSM 1910.119(d) is the foundational documentation element — the compilation of written process safety information that the employer must complete before conducting any PHA. PSI breaks into three categories: (d)(1) chemical hazard information (toxicity, PELs, physical data, reactivity, corrosivity), (d)(2) technology information (block flow diagram, process chemistry, maximum intended inventory, safe operating limits, consequence of deviation), and (d)(3) equipment information (materials of construction, P&IDs, electrical classification, relief device sizing, design codes).

Individual significance for organisations

PSI quality directly determines the quality of every downstream PSM decision. Organisations with accurate, current PSI run PHAs that catch real scenarios, MOCs that capture real implications, and incident investigations that reach real causes. Stale PSI is the slow leak that empties the management system over time.

Contribution to OSHA Process Safety Management (29 CFR 1910.119)

(d) is the prerequisite that (e) PHA, (f) procedures, (j) MI, and (l) MOC all depend on. OSHA explicitly requires PSI completion before any PHA. The element is the single most cited PSM finding in OSHA enforcement actions — stale P&IDs, missing relief calculations, and incomplete chemical hazard data are the silent enablers of every other element's failure.

Key requirements

What compliant execution looks like

Chemical hazard information per (d)(1) — SDS, GHS, reactivity, toxicity

Process technology information per (d)(2) — BFD, chemistry, inventory, operating limits

Equipment information per (d)(3) — MOC, P&IDs, HAC, relief sizing, codes

PSI completion before PHA per (d) preamble

MOC integration keeping PSI current

PSI accessibility to workforce and contractors

Implementation methodology

How we implement this element

A focused 6-step methodology calibrated to deliver process safety information (psi) as a working capability — not a documented compliance artefact.

PSI Inventory Baseline

Catalogue required PSI per (d)(1) / (d)(2) / (d)(3); identify gaps, version-control issues, accessibility constraints.

Chemical Hazard Information

Per (d)(1), compile SDS, GHS classification, toxicity data, physical properties, reactivity per CHETAH / Bretherick.

Technology Information

Per (d)(2), assemble BFD, process chemistry, maximum intended inventory, safe upper / lower limits, consequence of deviation.

Equipment Information

Per (d)(3), compile MOC, P&IDs, electrical classification, relief device sizing per API 520/521, ventilation, design codes.

MOC & Update Discipline

Specify MOC trigger for PSI update; enforce update before MOC closure; track PSI currency as leading indicator.

Operator Access Provision

Ensure operating teams can access PSI relevant to their unit; integrate with EDMS and shift handover.

Implementation flow

Element-implementation flow chart

Decision-gated workflow showing the actual sequence of activities — from initiation through steady-state operation — with key decision points highlighted.

Start

PSI baseline review initiated

(d)(1) Chemical Information

SDS, GHS, toxicity, reactivity per compound

(d)(2) Technology Information

BFD, chemistry, inventory, operating limits, consequence of deviation

(d)(3) Equipment Information

MOC, P&IDs, HAC, relief sizing, codes

P&ID Walk-Down

Field verification + as-built markup

Decision

Gap Identified?

Decision gate

Gap Closure

Engineering work to close missing PSI

MOC Trigger Specification

PSI update enforced before MOC closure

Access Mechanism Verification

Operator + contractor access tested

PSI Currency Dashboard

Monthly tracking; PHA-readiness signal

Deliverables

What we produce

Chemical hazard information dossier per (d)(1)
Technology information pack per (d)(2)
Equipment information register per (d)(3)
P&ID and PFD walked-down set
Relief device sizing calculations
PSI update procedure with MOC trigger

Common pitfalls

Where execution fails

P&IDs marked as-built but field reality has drifted further
Relief calculations done at original design — never recalculated post-MOC
Chemical hazard data missing for newer materials
Operator access blocked by document classification

Implement this element

Talk to us about implementing Process Safety Information (PSI)

We can scope this element implementation against your facility, regulatory context, and existing management-system maturity — and integrate it with the other OSHA Process Safety Management (29 CFR 1910.119) elements you already operate.

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