Process Hazard Analysis (PHA)
A process hazard analysis should help your team recognize the hazards that matter and decide what to do about them. Cognascents Consulting Group has facilitated thousands of PHAs across the chemical and oil and gas industries. We bring that experience to each study, from upfront preparation through focused facilitation and recommendations your team can act on.
When Clients Engage Us
Common reasons organizations engage PHA services
Organizations typically engage Cognascents for Process Hazard Analysis when they are facing:
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▸A PHA revalidation due within the OSHA 5-year window
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▸A new or modified process requiring an initial PHA before startup
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▸A backlog of unresolved PHA recommendations from the last cycle
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▸Facilitators or team members who lack HAZOP/LOPA experience
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▸Concerns that a prior PHA missed real scenarios or safeguards
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▸Findings from a PSM audit tied to PHA quality or documentation
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Our Approach
A PHA that reflects how your process actually runs.
A process hazard analysis (PHA) is a systematic evaluation of the hazards associated with a process, using recognized methodologies to identify scenarios, evaluate safeguards, and develop meaningful recommendations. It is required for every PSM-covered process under OSHA 29 CFR 1910.119(e) and for RMP Program 3 processes under EPA 40 CFR 68.67, with revalidation at least every five years. Cognascents facilitates PHAs using Hazard and Operability (HAZOP) studies, Layer of Protection Analysis (LOPA), What-If, HAZID, FMEA, and other techniques suited to your process.
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Step 01
Terms of Reference & PreparationWe establish the study scope, team, and objectives, then review P&IDs, process information, and prior PHA history and prepare the study nodes. This upfront work helps the team spend workshop time evaluating hazards rather than resolving missing information. |
Step 02
FacilitationA facilitator and dedicated scribe work together throughout the workshop. The facilitator guides the team through credible causes, consequences, and safeguards while the scribe captures the analysis and recommendations accurately as the discussion unfolds. |
Step 03
Report, Recommendations & Closure SupportWe deliver a complete, audit-ready PHA report and help you prioritize and track recommendations to closure, so the study doesn’t just sit on a shelf until the next revalidation. |
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AI-Accelerated Delivery
PHA facilitation delivered faster, with more time for expert analysis and QA.Cognascents’ AI-accelerated delivery model compresses the most labor-intensive phases of PHA facilitation, node preparation, consequence development, and post-session documentation, without reducing engineer accountability. Every phase completes a hard-gate SME review before work proceeds. AI accelerates the timeline. Our engineers own the output. 20–30%
Faster HAZOP preparation vs conventional baseline
2x
More time available for analysis and documentation
100%
PHA sign-off from all facilitators and documentarians
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“AI accelerates the delivery timeline. Engineers interpret, validate, and stand behind every output. No exclusions.” |
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“A PHA that only satisfies the five-year clock isn’t a PHA. It’s paperwork.”
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Why Cognascents
Why choose Cognascents for PHA and HAZOP facilitation
EXPERIENCE ACROSS COMPLEX PROCESSES
Highly Experienced PHA Facilitators.
Our teams have facilitated thousands of PHAs across the chemical, oil and gas, LNG, renewables, food and beverage, and other critical industries. Our facilitators bring deep HAZOP, LOPA, and multi-methodology experience together with real process engineering and process safety knowledge. That breadth helps our facilitators probe credible scenarios and assess the safeguards that matter for each process. |
PREPARATION THAT PROTECTS WORKSHOP TIME
Ready Before the Team Enters the Room
We understand that the most time-critical part of the PHA is the session. Our approach is prep-heavy: review the process information, prior studies, and study boundaries before the workshop. Thorough preparation helps the team focus on identifying hazards and making decisions, with fewer pauses to reconstruct missing context. |
PROCESS SAFETY + ENGINEERING CONTEXT
Engineering Context Beyond the PHA Worksheet
Process safety questions often lead to relief systems, instrumentation, corrosion, and operating limits. Our broader engineering and asset integrity experience helps connect findings to workable next steps. |
Standards & Codes We Work To
The regulatory frameworks and guidelines that govern Process Hazard Analysis.
OSHA 29 CFR 1910.119(e) — PHA requirements, including five-year revalidation under (e)(6)EPA 40 CFR 68.67 — PHA requirements for RMP Program 3 processesCCPS Guidelines for Hazard Evaluation Procedures
WHEN DOES YOUR NEXT PHA COME DUE?
Let’s talk about what your last PHA actually covered.
Our engineers will give you a direct read on whether your current PHA program would hold up under audit.
Keep reading for what a well-run PHA delivers and the services that connect to it. ↓↓
What You Gain
A PHA your team trusts and your auditor accepts.
A PHA is only valuable if it reflects real hazards and produces recommendations your team can actually close. Cognascents builds studies meant to hold up under both operational and regulatory scrutiny.
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THOROUGH HAZARD IDENTIFICATION
Scenarios evaluated with the right level of rigorWe apply the methodology that fits your process, not a one-size-fits-all checklist, so real hazards get identified rather than talked past. |
DEFENSIBLE DOCUMENTATION
A report that holds up under OSHA and EPA scrutinyOur documentation reflects the full analysis, from deviations through safeguards to recommendations, in a format auditors recognize. |
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ACTIONABLE RECOMMENDATIONS
Findings your team can actually close outWe develop recommendations that are specific and achievable, not vague findings that turn into a permanent backlog. |
COMPLIANCE WITH OSHA & EPA
PHA and RMP requirements satisfied on scheduleOur facilitation and documentation are built to meet 29 CFR 1910.119 and 40 CFR 68 requirements from the start. |
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Related Services
Supporting services that strengthen your PHA program
Cognascents connects PHA to the recommendations, limits, and broader program it feeds into.
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THE RECOMMENDATIONS YOUR PHA GENERATES
Open Recommendations ResolutionA PHA is only as valuable as the recommendations that get closed. We help you resolve the backlog your last study created. |
THE LIMITS YOUR PHA IDENTIFIES
Safe Operating Limits (SOL) DevelopmentPHA findings often point to the need for clearly defined operating limits. We develop both so they reinforce each other. |
THE PROGRAM YOUR PHA SUPPORTS
PSM Program Development and SupportPHA is one PSM element among many. We help you build and sustain the broader program it feeds into. |
Related Content
Process hazard analysis articles and case studies
Case studies and technical articles from the engineers who lead these engagements.
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CASE STUDY | PROCESS SAFETY
Process Hazard Analysis (PHA) Independent ReviewAn independent review of a facility’s PHA program after a disproportionate volume of recommendations raised questions about their validity. |
ARTICLE | PROCESS SAFETY
Common Process Hazard Analysis Pitfalls to AvoidThe mistakes teams make most often during a PHA, and how to keep the session focused on real hazards. |
ARTICLE | AI & ENGINEERING
AI-Accelerated Engineering Services: What does that really mean?How Cognascents applies AI to PHA facilitation and other engineering disciplines without loosening engineer accountability. |
PROCESS HAZARD ANALYSIS QUESTIONS, ANSWERED DIRECTLY
Frequently asked questions about PHA and HAZOP studies
What is a process hazard analysis (PHA)?
A PHA is a systematic, team-based evaluation of what can go wrong in a process — the causes, consequences, and safeguards for each credible scenario — and what should be done about the gaps. OSHA requires one for every PSM-covered process under 29 CFR 1910.119(e), and EPA requires the equivalent for RMP Program 3 processes under 40 CFR 68.67.
How often must a PHA be revalidated?
At least every five years under 29 CFR 1910.119(e)(6). Revalidation must confirm the analysis is consistent with the current process — so changes handled through management of change between cycles still have to be reflected, and a revalidation that ignores them will not survive an audit.
HAZOP, LOPA, What-If — which methodology is right?
OSHA lists acceptable methodologies in 1910.119(e)(2) and leaves the choice to the employer based on process complexity. HAZOP suits continuous, heavily instrumented processes; What-If and checklist approaches fit simpler or batch operations; LOPA complements a HAZOP where safeguards need quantified risk evaluation. The wrong fit wastes workshop time or misses scenarios.
Who must be on a PHA team?
Under 1910.119(e)(4), the team must include expertise in engineering and process operations, at least one member with experience and knowledge specific to the process being evaluated, and one member knowledgeable in the methodology being used. The facilitator’s job is to draw that knowledge out — not to substitute for it.
What happens to PHA recommendations after the study?
OSHA 1910.119(e)(5) requires a system to promptly address findings, resolve recommendations, document what was done, and communicate actions to affected personnel. An open recommendation is a documented, unresolved risk — which is why closure support is part of our delivery model.
Talk to a PHA facilitator about your next study
Tell us about your PHA program and where you think the gaps are. One of our engineers will give you a straight answer about what a properly facilitated PHA would find.