Process Safety Information (PSI)
The chemistry, technology, and equipment information for your process kept current and accessible to the people who need it
What this element is and why it matters
OSHA PSM at 1910.119(d) is the foundational documentation element. It is the compiled body of written process safety information that the employer has to complete before conducting any process hazard analysis. The information falls into three groups. Paragraph (d)(1) covers chemical hazard information such as toxicity, permissible exposure limits, physical data, reactivity, and corrosivity. Paragraph (d)(2) covers technology information including the block flow diagram, process chemistry, maximum intended inventory, safe operating limits, and the consequences of deviation. Paragraph (d)(3) covers equipment information such as materials of construction, P&IDs, electrical area classification, relief device sizing, and design codes. Our team assembles this so it is complete, accurate, and genuinely usable.
Individual significance for organisations
The quality of this information directly sets the quality of every downstream PSM decision your facility makes. With accurate and current information your team runs hazard analyses that catch real scenarios, manages change in a way that captures the real implications, and investigates incidents in a way that reaches the real causes. When the information goes stale it acts like a slow leak that empties the management system over time, and keeping it current is one of the most valuable things we help you do.
Contribution to OSHA Process Safety Management (29 CFR 1910.119)
Paragraph (d) is the prerequisite that process hazard analysis in (e), operating procedures in (f), mechanical integrity in (j), and management of change in (l) all depend on. OSHA explicitly requires this information to be complete before any hazard analysis is run. It is also the single most cited PSM finding in OSHA enforcement actions, because stale P&IDs, missing relief calculations, and incomplete chemical hazard data are the silent enablers of failure in every other element.
What compliant execution looks like
How we implement this element
A focused six step methodology calibrated to deliver process safety information (psi) as a working capability rather than a documented compliance artefact.
We catalogue the information required under (d)(1), (d)(2), and (d)(3) and identify gaps, version control issues, and any constraints on access.
To meet (d)(1) we compile safety data sheets, GHS classification, toxicity data, physical properties, and reactivity assessed against CHETAH and Bretherick.
To meet (d)(2) we assemble the block flow diagram, process chemistry, maximum intended inventory, safe upper and lower limits, and the consequences of deviation.
To meet (d)(3) we compile materials of construction, P&IDs, electrical classification, relief device sizing to API 520 and 521, ventilation, and design codes.
We specify the management of change trigger for updating the information, enforce the update before change closure, and track currency as a leading indicator.
We make sure operating teams can reach the information relevant to their unit and integrate it with your document system and shift handover.
Element implementation flow chart
A decision gated workflow that shows the actual sequence of activities from initiation through steady state operation, with key decision points highlighted.
What we produce
- A chemical hazard information dossier meeting (d)(1)
- A technology information pack meeting (d)(2)
- An equipment information register meeting (d)(3)
- A P&ID and process flow diagram set verified by field walk down
- Relief device sizing calculations
- An update procedure for the information with a management of change trigger
Where execution fails
- P&IDs marked as built while the field reality has already drifted further
- Relief calculations done at original design and never recalculated after a change
- Chemical hazard data missing for newer materials
- Operator access blocked by document classification
Codes this element is built on
Explore related elements in this framework
OSHA Process Safety Management (29 CFR 1910.119) full element index
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, then integrate it with the other OSHA Process Safety Management (29 CFR 1910.119) elements you already operate.